Strategies for designing composite materials for high temperature application

Abstract

A clear understanding of the factors controlling reproducible composite processing is critical for high temperature application. One approach to obtain stable phase combinations (i.e. compatibility) is to use a controlled interface reaction (in-situ layer design). An effective approach to control the reaction products and diffusion pathway by adding an extra component layer has been practiced and analyzed based upon the relative component fluxes. At the same time, the observed diffusion pathway has been examined in terms of a chemical potential framework, which can provide in assistance interpreting kinetic data in multicomponent systems. While component chemical potential values can increase and decrease through the interdiffusion reaction layers, the total free energy value will be decreased during the interdiffusion reaction. In order to examine the operating principles involved in the synthesis of in-situ composites, model ternary systems including potential materials such as TiAI and SiC have been investigated.

Titanium matrix reinforced composites produced by hot pressing of plasma-sprayed preforms

“…Long bre reinforced metal matrix composites are taking on a primary role in the eld of advanced materials for aerospace structural applications owing to their speci c properties guaranteed by the coupling of a ceramic reinforcement with a metallic matrix [1][2][3][4][5]. To date, the majority of these composites have been fabricated by diffusion bonding techniques using the foil-bre-foil method [6,7] or from alternating layers of woven bre mats and matrix foils [8].…”