Abstract
Future hypersonic and re-entry vehicles are expect to operate in an extremely reactive environment at temperatures in excess of 2000 °C and therefore, require thermal protection systems made of novel ultrahigh temperature materials with melting temperatures beyond 3000 °C. Ultrahigh temperature ceramics (UHTCs) such as zirconium diboride (ZrB 2 ) and hafnium diboride (HfB 2 ) based composites have emerged as the promising candidate materials for applications in sharp nose tips, wing leading edges, and engine components. Thus, this chapter summarizes the processing, mechanical properties and deformation response of UHTCs and concludes with a summary of directions for future research.
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