Advanced Processing Techniques For Co-Continuous Ceramic Composites

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Title:	Advanced Processing Techniques For Co-Continuous Ceramic Composites
Author:	Evarts, Jonathan S.
Description:	Co-Continuous Ceramic Composites have shown promise to replace traditional materials in high temperature applications due to their combination of strength at elevated temperature, thermal cycling damage tolerance and toughness. Prior work has demonstrated the displacement reaction resulting from immersion of silica precursors into an aluminum bath as an attractive method of creating net-shape alumina-aluminum composites. Here a similar reaction is studied where the bath is predominantly inert copper, however enough aluminum is still present to drive the reaction. Examination of several copper/aluminum ratios shows that an equivalent reaction occurs. However, as the copper fraction rises, reaction kinetics slow, and the microstructure scale decreases, yet the microstructural morphology remains similar. Additionally, the parent metal phase may be replaced with a more refractory material using a Hot Solvent Exchange Reaction. In this reaction both metallic species must be molten, however the processing temperature must be below that of the ceramic phase.
Permanent Link:	http://rave.ohiolink.edu/etdc/view?acc_num=osu1218218162 http://hdl.handle.net/2374.OX/106225
Date:	2008

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