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You searched for subject:(Interpenetrating phase structure). Showing records 1 – 2 of 2 total matches.

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University of New South Wales

1. Lott, Oliver. Interface design of copper/alumina composites with interpenetrating phase structure (Preform-MMCs).

Degree: Materials Science & Engineering, 2012, University of New South Wales

In composite science, interface characteristics have a significant influence on overall composite properties, especially with regard to co-continuous structures. Interface design, therefore, plays a significant role in the manufacture of reliable composites with enhanced mechanical properties; copper oxide, if added in small amounts to alumina preforms in the preparation process, enhances the overall composite properties considerably. The aim of this study is to understand the underlying phenomena and to explain the enhancement of the mechanical properties for reliable fabrication of copper/alumina composites with an interpenetrating phase structure in a squeeze casting infiltration process. The copper used for infiltration has low oxygen content (OF-quality), melted in a reducing atmosphere and, hence, has poor wetting properties. The addition of copper oxide enhances the infiltration process which is not governed by the infiltration initiation, but results in reactions during sintering leading to the formation of aluminate compounds in the microstructure. The aluminate phase is determined as brittle in nature by nanoindentation. The mechanical properties of the composite, however, are enhanced by a factor of two, exhibiting bending strength of up to 800 MPa for additions of as little as 2 wt% copper oxide with good reliability (Weibull modulus of 25.6). Fracture toughness and Young’s modulus are also enhanced to 9.6 MPa.m-0.5 and 220 GPa, respectively. These observed improvements are determined to be the result of reactions during infiltration, as the copper partly dissolves the aluminate phase leading to enhanced infiltration and interface bonding behaviour due to small levels of oxygen enrichment. Residual porosity is reduced and, consequently, mechanical properties enhanced. The dissolution of aluminate leads to fine-structured alumina phases remaining in the microstructure. Advisors/Committee Members: Hoffman, Mark, Materials Science & Engineering, Faculty of Science, UNSW, Sorrell, Charles, Materials Science & Engineering, Faculty of Science, UNSW.

Subjects/Keywords: Copper/alumina; Composite; Aluminate; Interpenetrating phase structure; Squeeze casting; Infiltration

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lott, O. (2012). Interface design of copper/alumina composites with interpenetrating phase structure (Preform-MMCs). (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/51604 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10271/SOURCE02?view=true

Chicago Manual of Style (16th Edition):

Lott, Oliver. “Interface design of copper/alumina composites with interpenetrating phase structure (Preform-MMCs).” 2012. Doctoral Dissertation, University of New South Wales. Accessed July 20, 2019. http://handle.unsw.edu.au/1959.4/51604 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10271/SOURCE02?view=true.

MLA Handbook (7th Edition):

Lott, Oliver. “Interface design of copper/alumina composites with interpenetrating phase structure (Preform-MMCs).” 2012. Web. 20 Jul 2019.

Vancouver:

Lott O. Interface design of copper/alumina composites with interpenetrating phase structure (Preform-MMCs). [Internet] [Doctoral dissertation]. University of New South Wales; 2012. [cited 2019 Jul 20]. Available from: http://handle.unsw.edu.au/1959.4/51604 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10271/SOURCE02?view=true.

Council of Science Editors:

Lott O. Interface design of copper/alumina composites with interpenetrating phase structure (Preform-MMCs). [Doctoral Dissertation]. University of New South Wales; 2012. Available from: http://handle.unsw.edu.au/1959.4/51604 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:10271/SOURCE02?view=true


Youngstown State University

2. Myers, Kyle M. Structure-Property Relationship of Binder Jetted Fused Silica Preforms to Manufacture Ceramic-Metallic Interpenetrating Phase Composites.

Degree: PhD, Department of Civil/Environmental and Chemical Engineering, 2016, Youngstown State University

Additive manufacturing (AM) is an area of high interest due to its rapid prototyping and high complexity abilities. Powder based AM techniques allow for a wide variety of materials to be studied. Here, the binder jetting of fused silica (SiO2) powders were investigated as precursor materials for subsequent molten metal infiltration and the manufacturing of metal-ceramic interpenetrating phase composites (IPCs). The structure property relationship of cured, sintered, and infiltrated states were correlated to the variables powder size, spread speed, binder saturation, layer thickness, and sintering temperature.The process parameters of the X1-Lab printer were optimized to manufacture the strongest SiO2 ceramic body with the highest density. The printed parts were subsequently infiltrated with molten aluminum to create unique Al/Al2O3 IPCs. The parameters of 48 µm powders, 0.5 mm/sec spread speed, 60% binder saturation, 100 µm layer thickness, and 1500°C sintering temperature resulted in the highest density and compression strength of both the sintered and composite states. It was also found, that the mechanical investigation of the composite materials exhibited a strain-rate dependency that was observed by the split Hopkinson testing. In addition to the aforementioned outcomes, it was found that further densification of the printed parts is required to achieve the full potential of additive manufacturing on synthesizing IPCs for structural applications. A homogenization technique was also carried out via Matlab, and it showed to be a quick and reliable simulation technique to predict the elastic modulus of a two-phase composite system. Finally, alternative processing techniques were explored to create dense printed and infiltrated parts. It was shown that the agglomeration of small particles and the addition of external pressure during the infiltration stage appear to be promising routes for increasing the density of IPCs manufactured via binder jetting. Advisors/Committee Members: Cortes, Pedro (Advisor).

Subjects/Keywords: Materials Science; Binder Jetting, Structure-property relationship, Interpenetrating Phase Composites, Additive Manufacturing

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Myers, K. M. (2016). Structure-Property Relationship of Binder Jetted Fused Silica Preforms to Manufacture Ceramic-Metallic Interpenetrating Phase Composites. (Doctoral Dissertation). Youngstown State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ysu1464089607

Chicago Manual of Style (16th Edition):

Myers, Kyle M. “Structure-Property Relationship of Binder Jetted Fused Silica Preforms to Manufacture Ceramic-Metallic Interpenetrating Phase Composites.” 2016. Doctoral Dissertation, Youngstown State University. Accessed July 20, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1464089607.

MLA Handbook (7th Edition):

Myers, Kyle M. “Structure-Property Relationship of Binder Jetted Fused Silica Preforms to Manufacture Ceramic-Metallic Interpenetrating Phase Composites.” 2016. Web. 20 Jul 2019.

Vancouver:

Myers KM. Structure-Property Relationship of Binder Jetted Fused Silica Preforms to Manufacture Ceramic-Metallic Interpenetrating Phase Composites. [Internet] [Doctoral dissertation]. Youngstown State University; 2016. [cited 2019 Jul 20]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ysu1464089607.

Council of Science Editors:

Myers KM. Structure-Property Relationship of Binder Jetted Fused Silica Preforms to Manufacture Ceramic-Metallic Interpenetrating Phase Composites. [Doctoral Dissertation]. Youngstown State University; 2016. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ysu1464089607

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