Hot Hardness of Selected Borides, Oxides, and Carbides to 1900°C

Abstract

The hot hardness of TiB 2 , W 2 B 5 , ZrB 2 , HfB 2 , ZrO 2 , Al 2 O 3 , NbC, Tic, TaC 1‐ x , HfG 1+ x , (Ta 0.8 Hf 0.2 )C 1+ x , W 2 C, and (W 0.65 Cr 0.14 Re 0.14 Ta 0.07 ) 2 C of <95% density was determined to temperatures approaching 1900°C. In all cases, the hardness decreased rapidly with increasing temperature. The data are compared to those available in the literature.