Ultrahigh temperature ceramics (UHTCs) such as diborides of zirconium, hafnium tantalum and their composites are considered to be the candidate materials for thermal protection systems of hypersonic vehicles due to their exceptional combination of physical, chemical and mechanical properties. A composite of ZrB2-TiB2 is expected to have better properties. In this study, an attempt has been made...

The elevated temperature thermal properties of zirconium diboride ceramics containing boron carbide additions up to 15 vol% were investigated using a combined experimental and modeling approach. addition B4C led decrease in the ZrB2 grain size from 22 µm for nominally pure 5.4 B4C. measured room conductivity decreased 93 W/m·K 80 also as increased. For ZrB2, was 67 at 2000 °C compared 55 A mode...