Contribution to the Phase Diagram Al ₄ C ₃ ‐AIN‐SiC

Abstract

Compositions on the join A1 4 C 3 ·2AIN‐A1 4 C 3 .2SiC were investigated using X‐ray diffraction and thermal analysis of hot‐pressed bodies prepared from materials of various purities. The quaternary phase A1 4 C 3 · AIN · SiC was observed in samples prepared from the high‐purity elements, but the ternary phases A1 4 C 3 ·2AIN and A1 4 C 3 ·2SiC were observed only in samples containing significant impurities. A projection onto the base triangle at 1860°C for the pseudoternary system Al 4 C 3 ‐AlN‐SiC was constructed using X‐ray diffraction, thermal analysis, and existing information in the literature.