Densification, Creep and Oxidation Behavior of ZrB2-SiC Based Ultra-High Temperature Ceramic Composites
ZrB2-SiC composites are candidate materials for use in thermal protection systems for leading edges and nose-cones of hypersonic vehicles. Densification of ZrB2 is considered challenging, because of its covalent bonding, which is responsibility for sluggish rate of lattice diffusion. It has been noticed that addition of 20 vol% SiC not only improves the creep and oxidation resistance in air by formation of a protective scale borosilicate glass, but also densification by inhibiting grain growth. Whereas densification and oxidation resistance are improved by addition of Si3N4, creep resistance is adversely affected due to increased grain boundary sliding.
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