Abstract
To clarify solution mechanism of chromium carbide in TiC-Cr3C2 system, the compacts of carbide mixtures containing up to 12.5 mol% Cr3C2 embedded in carbon black were solution treated in vacuo at temperatures below melting point of Cr3C2.
Changes in lattice parameter of δ phase were occurred at temperature not more than 1300°C, due to solution of any chromium carbide. At the same time, the formations of Cr7C3 and Cr23C6 were observed. At higher temperatures Cr3C2 was disappeared because of complete solution, and δ phase showed constant lattice parameter. On the other hand, Cr7C3 and Cr23C6 were vaporized from the bodies resulting increased weight loss. But small amount of them remain in the bodies even after complete solution of Cr3C2 into δ phase.
It was confirmed from these results that the solute substance into δ phase in TiC-Cr3C2 system was cubic CrC. Approximate lattice parameter of CrC calculated based on the results was 3.88Å.
