Abstract
A variety of oxidizable but self-protective materials are potential candidates for reinforcing media in ceramic-ceramic composites for use as high-temperature structural components in oxidizing environments. The oxidation kinetics of 10 to 30 percent dispersions of particles of SiC and MoSi/sub 2/ as well as SiC whiskers in fully dense matrices of alumina, mullite, and various silicates were determined in the temperature range of 1200-1500 C. SiC and MoSi/sub 2/, which form self-protective coatings of silica when heated as bulk pieces, exhibit an increase in their parabolic rate constants of 15-fold when incorporated in alumina or mullite matrices, and of almost 30-fold when incorporated in a strontium silicate matrix. Reaction mechanisms are discussed. 10 references.
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