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Universidade do Rio Grande do Norte
1.
Silva, Maria Thereza dos Santos.
Estudo do comportamento tribológico do lubrificante mineral 15W40 contaminado por Biodiesel e suas misturas com Diesel
.
Degree: 2018, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/25284 
► The use of biodiesel as fuel is growing in the world, so it is necessary to study the effects caused by this new fuel to…
(more)
▼ The use of biodiesel as fuel is growing in the world, so it is necessary to study the
effects caused by this new fuel to internal combustion engines. Thus, this study
aimed to study the contamination of a commercial mineral oil 15W40 with biodiesel
(B100) and its blends with diesel (B10 and B20), in terms of their impact on the
physicochemical and tribological properties of the lubricating oil. Based on studies, it
was determined that for each contaminant was used in percentages of contamination
between 1% and 2%. Several physical-chemical analyzes were performed to
ascertain the behavior of the contaminated lubricating oil, comparing them to the
specifications required by the quality organs. Some techniques (DSC, acidity index
and FTIR) were also applied in order to investigate their behavior when aged.
Contaminated lubricants also underwent lubricity analyzes on the HFRR tribometer,
using AISI 52100 steel as test specimens. These specimens at the end of the test
underwent a superficial analysis in order to understand the extent of wear and tear
suffered by this type of contamination. The results showed that contaminated
lubricants do not present great risks to their properties, but when aged, they increase
the number of saturated esters, reduce the oxidative stability and increase the
acidity. The behavior of the contaminated lubricants aged was different than
expected, as it caused a better performance in the lubricity, thus the antioxidant
additives, contrary to expectations.
Advisors/Committee Members: Alves, Salete Martins (advisor), 02046752945 (advisor).
Subjects/Keywords: Biodiesel;
Lubrificantes;
Contaminação;
Lubricidade
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APA (6th Edition):
Silva, M. T. d. S. (2018). Estudo do comportamento tribológico do lubrificante mineral 15W40 contaminado por Biodiesel e suas misturas com Diesel
. (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/25284
Chicago Manual of Style (16th Edition):
Silva, Maria Thereza dos Santos. “Estudo do comportamento tribológico do lubrificante mineral 15W40 contaminado por Biodiesel e suas misturas com Diesel
.” 2018. Masters Thesis, Universidade do Rio Grande do Norte. Accessed December 07, 2019.
http://repositorio.ufrn.br/handle/123456789/25284.
MLA Handbook (7th Edition):
Silva, Maria Thereza dos Santos. “Estudo do comportamento tribológico do lubrificante mineral 15W40 contaminado por Biodiesel e suas misturas com Diesel
.” 2018. Web. 07 Dec 2019.
Vancouver:
Silva MTdS. Estudo do comportamento tribológico do lubrificante mineral 15W40 contaminado por Biodiesel e suas misturas com Diesel
. [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2018. [cited 2019 Dec 07].
Available from: http://repositorio.ufrn.br/handle/123456789/25284.
Council of Science Editors:
Silva MTdS. Estudo do comportamento tribológico do lubrificante mineral 15W40 contaminado por Biodiesel e suas misturas com Diesel
. [Masters Thesis]. Universidade do Rio Grande do Norte; 2018. Available from: http://repositorio.ufrn.br/handle/123456789/25284
Universidade do Rio Grande do Norte
2.
Farias, Aline Cristina Mendes de.
Lubricidade de biodiesel e sua associação com a vibração e nível de pressão sonora oriundos do contato esfera-plano sob deslizamento alternado
.
Degree: 2015, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/20563
► The lubricity of biodiesel interferes in the normal operation of diesel injection systems, especially in nozzles. It can reduce the wear and raise the lifetime…
(more)
▼ The lubricity of biodiesel interferes in the normal operation of diesel injection systems, especially in nozzles. It can reduce the wear and raise the lifetime of the engine supply line. The method HFRR (High Frequency Reciprocating Rig) is a standard test for evaluation of diesel/ biodiesel lubricity (ASTM D6079). The HFRR lubricity evaluation mainly consists of measuring the printed scar wear on the ball. When wear is developing, some dynamic features of the system vary and it results in significant changes in the patterns of vibration, sound pressure level (SPL) and friction signals. The acquisition and characterization of signatures of these signals obtained during tribological tests are an important non-intrusive tool for evaluating of the lubricity of these fuels, whose representation in the time domain not always reveals trivial information. This requires signal transformation to the frequency domain using the Fast Fourier Transform (FFT) and Short-Time Fourier Transform (STFT) analyses. This thesis aimed to develop a dynamic assessment of lubricity fuels (Diesel S50, Methyl Ester of Soybean and B10 and B20 blends) in HFRR bench (ball-on-flat disk contact), and improving the methodological framework of ASTM D6079 standard by application of signal analysis techniques (vibration and SPL) and its association with parameters provided by ASTM D6079 (wear scar diameter) lasting 75, 120 and 180 minutes. The profiles and topographic parameters of scars and their microscopic analysis were used to further evaluate the influence of the time and fuel in the wear evolution of disk. In this evaluation, the fuel lubricity was influenced by increasing of biodiesel content and decreasing of number of cycles applied. From the temporal and frequency spectrum analysis of the vibration and NPS signals it is shown that both vibration and NPS stablish a relation with fuel lubricity, biodiesel content, number of cycles and parameters of profiles from scar of discs.
Advisors/Committee Members: Alves, Salete Martins (advisor), 02046752945 (advisor), http://lattes.cnpq.br/8550161853747323 (advisor), Medeiros, João Telesforo Nóbrega de (advisor), 10973370491 (advisor), http://lattes.cnpq.br/3206952338356447 (advisor).
Subjects/Keywords: Lubricidade;
Biodiesel;
Aço AISI 52100;
Desgaste;
Análise de sinais
Record Details
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Record Details
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Farias, A. C. M. d. (2015). Lubricidade de biodiesel e sua associação com a vibração e nível de pressão sonora oriundos do contato esfera-plano sob deslizamento alternado
. (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/20563
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Farias, Aline Cristina Mendes de. “Lubricidade de biodiesel e sua associação com a vibração e nível de pressão sonora oriundos do contato esfera-plano sob deslizamento alternado
.” 2015. Thesis, Universidade do Rio Grande do Norte. Accessed December 07, 2019.
http://repositorio.ufrn.br/handle/123456789/20563.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Farias, Aline Cristina Mendes de. “Lubricidade de biodiesel e sua associação com a vibração e nível de pressão sonora oriundos do contato esfera-plano sob deslizamento alternado
.” 2015. Web. 07 Dec 2019.
Vancouver:
Farias ACMd. Lubricidade de biodiesel e sua associação com a vibração e nível de pressão sonora oriundos do contato esfera-plano sob deslizamento alternado
. [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2015. [cited 2019 Dec 07].
Available from: http://repositorio.ufrn.br/handle/123456789/20563.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Farias ACMd. Lubricidade de biodiesel e sua associação com a vibração e nível de pressão sonora oriundos do contato esfera-plano sob deslizamento alternado
. [Thesis]. Universidade do Rio Grande do Norte; 2015. Available from: http://repositorio.ufrn.br/handle/123456789/20563
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universidade do Rio Grande do Norte
3.
Farias, Aline Cristina Mendes de.
Análise da lubricidade do biodiesel brasileiro de ésteres etílicos de soja e girassol
.
Degree: 2011, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/15677
► Fuel is a material used to produce heat or power by burning, and lubricity is the capacity for reducing friction. The aim of this work…
(more)
▼ Fuel is a material used to produce heat or power by burning, and lubricity is the capacity for reducing friction. The aim of this work is evaluate the lubricity of eight fossil and renewable fuels used in Diesel engines, by means of a HFRR tester, following the ASTM D 6079-04 Standard. In this conception, a sphere of AISI 52100 steel (diameter of 6,000,05 mm, Ra 0,050,005 μm, E = 210 GPa, HRC 624, HV0,2 63147) is submitted to a reciprocating motion under a normal load of 2 N and 50 Hz frequency to promote a wear track length of 1.10.1mm in a plan disc of AISI 52100 steel (HV0,05 18410, Ra 0,020,005 μm). The testing extent time was 75 minutes, 225,000 cycles. Each one test was repeated six times to furnish the results, by means of intrinsic signatures from the signals of the lubricant film percentage, friction coefficient, contact heating, Sound Pressure Level, SPL [dB]. These signal signatures were obtained by two thermocouples and a portable decibelmeter coupled to a data acquisition system and to the HFRR system. The wettability of droplet of the diesel fuel in thermal equilibrium on a horizontal surface of a virgin plan disc of 52100 steel, Ra 0,02 0,005 μm, were measured by its contact angle of 7,0 3,5o, while the results obtained for the biodiesel B5, B20 and B100 blends originated by the ethylic transesterification of soybean oil were, respectively, 7,5 3,5o, 13,5 3,5o e 19,0 1,0o; for the distilled water, 78,0 6,0o; the biodiesel B5, B20 and B100 blends originated by the ethylic transesterification of sunflower oil were, respectively, 7,0 4,0o, 8,5 4,5o e 19,5 2,5o. Different thickness of lubricant film were formed and measured by their percentage by means of the contact resistance technique, suggesting several regimes, since the boundary until the hydrodynamic lubrication. All oils analyzed in this study promoted the ball wear scars with diameters smaller than 400 μm. The lowest values were observed in the scar balls lubricated by mixtures B100, B20 and B5 of sunflower and B20 and B5 of soybean oils (WSD < 215 μm)
Advisors/Committee Members: Medeiros, João Telésforo Nóbrega de (advisor), CPF:10973370491 (advisor), http://lattes.cnpq.br/3206952338356447 (advisor), Barbosa, Cleiton Rubens Formiga (advisor), CPF:22174443449 (advisor), http://lattes.cnpq.br/8673332414572221 (advisor).
Subjects/Keywords: HFRR;
lubricidade;
diesel;
biodiesel;
desgaste;
diesel;
biodiesel;
wear;
lubricity;
HFRR
Record Details
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Record Details
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Farias, A. C. M. d. (2011). Análise da lubricidade do biodiesel brasileiro de ésteres etílicos de soja e girassol
. (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15677
Chicago Manual of Style (16th Edition):
Farias, Aline Cristina Mendes de. “Análise da lubricidade do biodiesel brasileiro de ésteres etílicos de soja e girassol
.” 2011. Masters Thesis, Universidade do Rio Grande do Norte. Accessed December 07, 2019.
http://repositorio.ufrn.br/handle/123456789/15677.
MLA Handbook (7th Edition):
Farias, Aline Cristina Mendes de. “Análise da lubricidade do biodiesel brasileiro de ésteres etílicos de soja e girassol
.” 2011. Web. 07 Dec 2019.
Vancouver:
Farias ACMd. Análise da lubricidade do biodiesel brasileiro de ésteres etílicos de soja e girassol
. [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2011. [cited 2019 Dec 07].
Available from: http://repositorio.ufrn.br/handle/123456789/15677.
Council of Science Editors:
Farias ACMd. Análise da lubricidade do biodiesel brasileiro de ésteres etílicos de soja e girassol
. [Masters Thesis]. Universidade do Rio Grande do Norte; 2011. Available from: http://repositorio.ufrn.br/handle/123456789/15677
Universidade do Rio Grande do Norte
4.
Santos, Erinéia da Silva.
Desenvolvimento e avaliação tribológica de emulsão O/A a partir de óleo vegetal epoxidado para aplicação em fluídos de corte
.
Degree: 2014, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/19829
► The cutting fluids are lubricants used in machining processes, because they present many benefits for different processes. They have many functions, such as lubrication, cooling,…
(more)
▼ The cutting fluids are lubricants used in machining processes, because they present many
benefits for different processes. They have many functions, such as lubrication, cooling,
improvement in surface finishing, besides they decreases the tool wear and protect it against
corrosion. Therefore due to new environment laws and demand to green products, new cutting
fluids must be development. These shall be biodegradable, non-toxic, safety for environment
and operator healthy. Thus, vegetable oils are a good option to solve this problem, replacing
the mineral oils. In this context, this work aimed to develop an emulsion cutting fluid from
epoxidized vegetable oil, promoting better lubrication and cooling in machining processes,
besides being environment friendly. The methodology was divided in five steps: first one was
the biolubricant synthesis by epoxidation reaction. Following this, the biolubricant was
characterized in terms of density, acidity, iodo index, oxirane index, viscosity, thermal
stability and chemical composition. The third step was to develop an emulsion O/A with
different oil concentration (10, 20 and 25%) and surfactant concentration (1, 2.5 and 5%).
Also, emulsion stability was studied. The emulsion tribological performance were carried out
in HFRR (High Frequency Reciprocating Rig), it consists in ball-disc contact. Results showed
that the vegetable based lubricant may be synthesized by epoxidationreaction, the spectra
showed that there was 100% conversion of the epoxy rings unsaturations. In regard the
tribological assessment is observed that the percentage of oil present in the emulsion directly
influenced the film formation and coefficient of friction for higher concentrations the film
formation process is slow and unstable, and the coefficient of friction. The high
concentrations of surfactants have not improved the emulsions tribological performance. The
best performance in friction reduction was observed to emulsion with 10% of oil and 5% of
surfactant, its average wear scar was 202 μm.
Advisors/Committee Members: Alves, Salete Martins (advisor), 02046752945 (advisor), http://lattes.cnpq.br/8550161853747323 (advisor).
Subjects/Keywords: Fluido de corte;
Emulsões O/A;
Estabilidade;
Lubricidade;
Processo de usinagem
Record Details
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Share »
Record Details
Similar Records
Cite
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Santos, E. d. S. (2014). Desenvolvimento e avaliação tribológica de emulsão O/A a partir de óleo vegetal epoxidado para aplicação em fluídos de corte
. (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/19829
Chicago Manual of Style (16th Edition):
Santos, Erinéia da Silva. “Desenvolvimento e avaliação tribológica de emulsão O/A a partir de óleo vegetal epoxidado para aplicação em fluídos de corte
.” 2014. Masters Thesis, Universidade do Rio Grande do Norte. Accessed December 07, 2019.
http://repositorio.ufrn.br/handle/123456789/19829.
MLA Handbook (7th Edition):
Santos, Erinéia da Silva. “Desenvolvimento e avaliação tribológica de emulsão O/A a partir de óleo vegetal epoxidado para aplicação em fluídos de corte
.” 2014. Web. 07 Dec 2019.
Vancouver:
Santos EdS. Desenvolvimento e avaliação tribológica de emulsão O/A a partir de óleo vegetal epoxidado para aplicação em fluídos de corte
. [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2014. [cited 2019 Dec 07].
Available from: http://repositorio.ufrn.br/handle/123456789/19829.
Council of Science Editors:
Santos EdS. Desenvolvimento e avaliação tribológica de emulsão O/A a partir de óleo vegetal epoxidado para aplicação em fluídos de corte
. [Masters Thesis]. Universidade do Rio Grande do Norte; 2014. Available from: http://repositorio.ufrn.br/handle/123456789/19829
Universidade do Rio Grande do Norte
5.
Farias, Aline Cristina Mendes de.
Lubricidade de biodiesel e sua associação com a vibração e nível de pressão sonora oriundos do contato esfera-plano sob deslizamento alternado
.
Degree: 2015, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/20563
► The lubricity of biodiesel interferes in the normal operation of diesel injection systems, especially in nozzles. It can reduce the wear and raise the lifetime…
(more)
▼ The lubricity of biodiesel interferes in the normal operation of diesel injection systems, especially in nozzles. It can reduce the wear and raise the lifetime of the engine supply line. The method HFRR (High Frequency Reciprocating Rig) is a standard test for evaluation of diesel/ biodiesel lubricity (ASTM D6079). The HFRR lubricity evaluation mainly consists of measuring the printed scar wear on the ball. When wear is developing, some dynamic features of the system vary and it results in significant changes in the patterns of vibration, sound pressure level (SPL) and friction signals. The acquisition and characterization of signatures of these signals obtained during tribological tests are an important non-intrusive tool for evaluating of the lubricity of these fuels, whose representation in the time domain not always reveals trivial information. This requires signal transformation to the frequency domain using the Fast Fourier Transform (FFT) and Short-Time Fourier Transform (STFT) analyses. This thesis aimed to develop a dynamic assessment of lubricity fuels (Diesel S50, Methyl Ester of Soybean and B10 and B20 blends) in HFRR bench (ball-on-flat disk contact), and improving the methodological framework of ASTM D6079 standard by application of signal analysis techniques (vibration and SPL) and its association with parameters provided by ASTM D6079 (wear scar diameter) lasting 75, 120 and 180 minutes. The profiles and topographic parameters of scars and their microscopic analysis were used to further evaluate the influence of the time and fuel in the wear evolution of disk. In this evaluation, the fuel lubricity was influenced by increasing of biodiesel content and decreasing of number of cycles applied. From the temporal and frequency spectrum analysis of the vibration and NPS signals it is shown that both vibration and NPS stablish a relation with fuel lubricity, biodiesel content, number of cycles and parameters of profiles from scar of discs.
Advisors/Committee Members: Alves, Salete Martins (advisor), 02046752945 (advisor), http://lattes.cnpq.br/8550161853747323 (advisor), Medeiros, João Telesforo Nóbrega de (advisor), 10973370491 (advisor), http://lattes.cnpq.br/3206952338356447 (advisor).
Subjects/Keywords: Lubricidade;
Biodiesel;
Aço AISI 52100;
Desgaste;
Análise de sinais
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Farias, A. C. M. d. (2015). Lubricidade de biodiesel e sua associação com a vibração e nível de pressão sonora oriundos do contato esfera-plano sob deslizamento alternado
. (Doctoral Dissertation). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/20563
Chicago Manual of Style (16th Edition):
Farias, Aline Cristina Mendes de. “Lubricidade de biodiesel e sua associação com a vibração e nível de pressão sonora oriundos do contato esfera-plano sob deslizamento alternado
.” 2015. Doctoral Dissertation, Universidade do Rio Grande do Norte. Accessed December 07, 2019.
http://repositorio.ufrn.br/handle/123456789/20563.
MLA Handbook (7th Edition):
Farias, Aline Cristina Mendes de. “Lubricidade de biodiesel e sua associação com a vibração e nível de pressão sonora oriundos do contato esfera-plano sob deslizamento alternado
.” 2015. Web. 07 Dec 2019.
Vancouver:
Farias ACMd. Lubricidade de biodiesel e sua associação com a vibração e nível de pressão sonora oriundos do contato esfera-plano sob deslizamento alternado
. [Internet] [Doctoral dissertation]. Universidade do Rio Grande do Norte; 2015. [cited 2019 Dec 07].
Available from: http://repositorio.ufrn.br/handle/123456789/20563.
Council of Science Editors:
Farias ACMd. Lubricidade de biodiesel e sua associação com a vibração e nível de pressão sonora oriundos do contato esfera-plano sob deslizamento alternado
. [Doctoral Dissertation]. Universidade do Rio Grande do Norte; 2015. Available from: http://repositorio.ufrn.br/handle/123456789/20563
Universidade do Rio Grande do Norte
6.
Farias, Aline Cristina Mendes de.
Análise da lubricidade do biodiesel brasileiro de ésteres etílicos de soja e girassol
.
Degree: 2011, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/15677
► Fuel is a material used to produce heat or power by burning, and lubricity is the capacity for reducing friction. The aim of this work…
(more)
▼ Fuel is a material used to produce heat or power by burning, and lubricity is the capacity for reducing friction. The aim of this work is evaluate the lubricity of eight fossil and renewable fuels used in Diesel engines, by means of a HFRR tester, following the ASTM D 6079-04 Standard. In this conception, a sphere of AISI 52100 steel (diameter of 6,000,05 mm, Ra 0,050,005 μm, E = 210 GPa, HRC 624, HV0,2 63147) is submitted to a reciprocating motion under a normal load of 2 N and 50 Hz frequency to promote a wear track length of 1.10.1mm in a plan disc of AISI 52100 steel (HV0,05 18410, Ra 0,020,005 μm). The testing extent time was 75 minutes, 225,000 cycles. Each one test was repeated six times to furnish the results, by means of intrinsic signatures from the signals of the lubricant film percentage, friction coefficient, contact heating, Sound Pressure Level, SPL [dB]. These signal signatures were obtained by two thermocouples and a portable decibelmeter coupled to a data acquisition system and to the HFRR system. The wettability of droplet of the diesel fuel in thermal equilibrium on a horizontal surface of a virgin plan disc of 52100 steel, Ra 0,02 0,005 μm, were measured by its contact angle of 7,0 3,5o, while the results obtained for the biodiesel B5, B20 and B100 blends originated by the ethylic transesterification of soybean oil were, respectively, 7,5 3,5o, 13,5 3,5o e 19,0 1,0o; for the distilled water, 78,0 6,0o; the biodiesel B5, B20 and B100 blends originated by the ethylic transesterification of sunflower oil were, respectively, 7,0 4,0o, 8,5 4,5o e 19,5 2,5o. Different thickness of lubricant film were formed and measured by their percentage by means of the contact resistance technique, suggesting several regimes, since the boundary until the hydrodynamic lubrication. All oils analyzed in this study promoted the ball wear scars with diameters smaller than 400 μm. The lowest values were observed in the scar balls lubricated by mixtures B100, B20 and B5 of sunflower and B20 and B5 of soybean oils (WSD < 215 μm)
Advisors/Committee Members: Medeiros, João Telésforo Nóbrega de (advisor), CPF:10973370491 (advisor), http://lattes.cnpq.br/3206952338356447 (advisor), Barbosa, Cleiton Rubens Formiga (advisor), CPF:22174443449 (advisor), http://lattes.cnpq.br/8673332414572221 (advisor).
Subjects/Keywords: HFRR;
lubricidade;
diesel;
biodiesel;
desgaste;
diesel;
biodiesel;
wear;
lubricity;
HFRR
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Farias, A. C. M. d. (2011). Análise da lubricidade do biodiesel brasileiro de ésteres etílicos de soja e girassol
. (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15677
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Farias, Aline Cristina Mendes de. “Análise da lubricidade do biodiesel brasileiro de ésteres etílicos de soja e girassol
.” 2011. Thesis, Universidade do Rio Grande do Norte. Accessed December 07, 2019.
http://repositorio.ufrn.br/handle/123456789/15677.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Farias, Aline Cristina Mendes de. “Análise da lubricidade do biodiesel brasileiro de ésteres etílicos de soja e girassol
.” 2011. Web. 07 Dec 2019.
Vancouver:
Farias ACMd. Análise da lubricidade do biodiesel brasileiro de ésteres etílicos de soja e girassol
. [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2011. [cited 2019 Dec 07].
Available from: http://repositorio.ufrn.br/handle/123456789/15677.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Farias ACMd. Análise da lubricidade do biodiesel brasileiro de ésteres etílicos de soja e girassol
. [Thesis]. Universidade do Rio Grande do Norte; 2011. Available from: http://repositorio.ufrn.br/handle/123456789/15677
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universidade do Rio Grande do Norte
7.
Santos, Erinéia da Silva.
Desenvolvimento e avaliação tribológica de emulsão O/A a partir de óleo vegetal epoxidado para aplicação em fluídos de corte
.
Degree: 2014, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/19829
► The cutting fluids are lubricants used in machining processes, because they present many benefits for different processes. They have many functions, such as lubrication, cooling,…
(more)
▼ The cutting fluids are lubricants used in machining processes, because they present many
benefits for different processes. They have many functions, such as lubrication, cooling,
improvement in surface finishing, besides they decreases the tool wear and protect it against
corrosion. Therefore due to new environment laws and demand to green products, new cutting
fluids must be development. These shall be biodegradable, non-toxic, safety for environment
and operator healthy. Thus, vegetable oils are a good option to solve this problem, replacing
the mineral oils. In this context, this work aimed to develop an emulsion cutting fluid from
epoxidized vegetable oil, promoting better lubrication and cooling in machining processes,
besides being environment friendly. The methodology was divided in five steps: first one was
the biolubricant synthesis by epoxidation reaction. Following this, the biolubricant was
characterized in terms of density, acidity, iodo index, oxirane index, viscosity, thermal
stability and chemical composition. The third step was to develop an emulsion O/A with
different oil concentration (10, 20 and 25%) and surfactant concentration (1, 2.5 and 5%).
Also, emulsion stability was studied. The emulsion tribological performance were carried out
in HFRR (High Frequency Reciprocating Rig), it consists in ball-disc contact. Results showed
that the vegetable based lubricant may be synthesized by epoxidationreaction, the spectra
showed that there was 100% conversion of the epoxy rings unsaturations. In regard the
tribological assessment is observed that the percentage of oil present in the emulsion directly
influenced the film formation and coefficient of friction for higher concentrations the film
formation process is slow and unstable, and the coefficient of friction. The high
concentrations of surfactants have not improved the emulsions tribological performance. The
best performance in friction reduction was observed to emulsion with 10% of oil and 5% of
surfactant, its average wear scar was 202 μm.
Advisors/Committee Members: Alves, Salete Martins (advisor), 02046752945 (advisor), http://lattes.cnpq.br/8550161853747323 (advisor).
Subjects/Keywords: Fluido de corte;
Emulsões O/A;
Estabilidade;
Lubricidade;
Processo de usinagem
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APA (6th Edition):
Santos, E. d. S. (2014). Desenvolvimento e avaliação tribológica de emulsão O/A a partir de óleo vegetal epoxidado para aplicação em fluídos de corte
. (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/19829
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Santos, Erinéia da Silva. “Desenvolvimento e avaliação tribológica de emulsão O/A a partir de óleo vegetal epoxidado para aplicação em fluídos de corte
.” 2014. Thesis, Universidade do Rio Grande do Norte. Accessed December 07, 2019.
http://repositorio.ufrn.br/handle/123456789/19829.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Santos, Erinéia da Silva. “Desenvolvimento e avaliação tribológica de emulsão O/A a partir de óleo vegetal epoxidado para aplicação em fluídos de corte
.” 2014. Web. 07 Dec 2019.
Vancouver:
Santos EdS. Desenvolvimento e avaliação tribológica de emulsão O/A a partir de óleo vegetal epoxidado para aplicação em fluídos de corte
. [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2014. [cited 2019 Dec 07].
Available from: http://repositorio.ufrn.br/handle/123456789/19829.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Santos EdS. Desenvolvimento e avaliação tribológica de emulsão O/A a partir de óleo vegetal epoxidado para aplicação em fluídos de corte
. [Thesis]. Universidade do Rio Grande do Norte; 2014. Available from: http://repositorio.ufrn.br/handle/123456789/19829
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
8.
Lincoln Davi Mendes de Oliveira.
SÃntese, caracterizaÃÃo e funcionalidade de aditivos de lubricidade, derivados do LLC.
Degree: Master, 2007, Universidade Federal do Ceará
URL: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1455
;
► Este trabalho relata a sÃntese, caracterizaÃÃo e anÃlise de compostos fosforados com potencial lubrificante, obtidos a partir do LCC, um subproduto da indÃstria de processamento…
(more)
▼ Este trabalho relata a sÃntese, caracterizaÃÃo e anÃlise de compostos fosforados com potencial lubrificante, obtidos a partir do LCC, um subproduto da indÃstria de processamento da castanha. Os quatro compostos sintetizados [Dietil-3-n-pentadecilfenol tiofosfato (1), Dietil-3-n-pentadecilfenol fosfato (2), Difenil-3-n-pentadecilfenol fosfato (3) e Tri-3-n-pentadecilfenol fosfato (4)] utilizaram como precursor o 3-n-pentadecilfenol (cardanol hidrogenado) e foram caracterizados por um conjunto de tÃcnicas experimentais (RMN 1H, 13C e 31P, infravermelho e CG/EM) que revelaram a pureza dos mesmos. A estabilidade tÃrmica dos compostos foi verificada atravÃs de vÃrios estÃgios de degradaÃÃo tÃrmica. Os compostos (1) e (2) sÃo menos estÃveis que (3) e (4), no entanto, todos eles apresentaram-se dentro da faixa da temperatura de degradaÃÃo para os aditivos de lubricidade comerciais similares. A estabilidade oxidativa foi avaliada utilizando mÃtodo do oxigÃnio ativo. Todos os Ãleos aditivados apresentaram diminuiÃÃo no Ãndice de acidez caracterizando-os como potenciais antioxidantes, especialmente no que se refere à relaÃÃo custo/benefÃcio, fator importante na escolha de um aditivo ressaltando-se o excelente desempenho do composto (1). A anÃlise do potencial lubrificante revelou diminuiÃÃo no desgaste das esferas cobertas com os Ãleos aditivados quando comparados ao padrÃo (sem aditivo). O teste de lubricidade revelou que todos compostos encontram-se dentro dos parÃmetros exigidos pela legislaÃÃo em vigor na concentraÃÃo de 2%.
This work repots the synthesis, characterization and analysis of the phosphorous compounds with lubricant potential, obtained from CNSL, a byproduct of cashew nut
processing industries. The four synthesized compounds [Diethyl-3-n-pentadecylphenol thiophosphate (1), Diethyl-3-n-pentadecylphenol phosphate (2), Diphenil-3-n-pentadecylphenol phosphate (3) and Tri-3-n-entadecylphenol phosphate (4)] used 3-npentadecylphenol (hydrogenated cardanol) as forerunner and were characterized by spectroscopic techniques (NMR 1H, 13C and 31P, infrared and GC/MS) that revealed their purity. The thermal stability of all compounds was verified by several steps of thermal degradation. Compounds (1) and (2) were less stable than (3) and (4), but, all of them showed degradation temperatures in the similar range of commercial lubricity additives. The oxidative stability was evaluated using the active oxygen method. All the additivated oils showed a decreasing in the acid scale , characterizing the compounds as potential antioxidants, especially relative to the cost/benefit ratio, emphasizing the excellent performance of the compound. The analysis of the lubricant potential revealed a diminution in the wear of the spheres covered with additivated oils when compared to the standard (without additive). The test of lubricity revealed that all compounds are inside the parameters required by the present legislation in the concentration of 2 %.
Advisors/Committee Members: Edilberto Rocha Silveira, Sandro Thomaz Gouveia, Selma Elaine Mazzetto.
Subjects/Keywords: QUIMICA; SÃntese; aditivo; fosforado; lubricidade; lÃquido da casca da castanha do caju; Synthesis; additive; phosphorous; lubricant; liquid of cashew nut
Record Details
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Record Details
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Oliveira, L. D. M. d. (2007). SÃntese, caracterizaÃÃo e funcionalidade de aditivos de lubricidade, derivados do LLC. (Masters Thesis). Universidade Federal do Ceará. Retrieved from http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1455 ;
Chicago Manual of Style (16th Edition):
Oliveira, Lincoln Davi Mendes de. “SÃntese, caracterizaÃÃo e funcionalidade de aditivos de lubricidade, derivados do LLC.” 2007. Masters Thesis, Universidade Federal do Ceará. Accessed December 07, 2019.
http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1455 ;.
MLA Handbook (7th Edition):
Oliveira, Lincoln Davi Mendes de. “SÃntese, caracterizaÃÃo e funcionalidade de aditivos de lubricidade, derivados do LLC.” 2007. Web. 07 Dec 2019.
Vancouver:
Oliveira LDMd. SÃntese, caracterizaÃÃo e funcionalidade de aditivos de lubricidade, derivados do LLC. [Internet] [Masters thesis]. Universidade Federal do Ceará 2007. [cited 2019 Dec 07].
Available from: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1455 ;.
Council of Science Editors:
Oliveira LDMd. SÃntese, caracterizaÃÃo e funcionalidade de aditivos de lubricidade, derivados do LLC. [Masters Thesis]. Universidade Federal do Ceará 2007. Available from: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1455 ;
. 
Open Access Theses and Dissertations