Abstract
The effect of B4C and CNT on the multi-length scale wear damage tolerance as well as the high temperature oxidation behavior of HfB2-ZrB2-SiC composites has been elucidated. Wear results indicated that the synergistic addition of reinforcements (B4C and CNT) and solid solutioning in (Hf,Zr)B2 has led to enhancement in the wear resistance up to ~42% (during fretting wear) and ~70% (during the scratch test). Wear mechanisms were observed to be abrasion, brittle tensile cracking followed by fracture, the extent of which decreases with combined effect of B4C and CNT. The onset temperature of oxide formation shifts from <700 °C for monolithic diborides to >900 °C for solid-solutionized and reinforced HfB2-ZrB2 UHTCs eliciting that the thermal stability augments with the reinforcements. Thus, the synergy of reinforcement and solid-solutioning favorably enhances the wear and oxidation resistance of HfB2-ZrB2-SiC composites affirming their viability for application in harsh re-entry conditions.
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