Effect of Secondary Carbide Additions on the Phase Stability of Nanocrystalline (Ti, M)(CN)- and (Ti,M1,M2)(CN)-Ni Cermets

摘要

Nanocrystalline (Ti,W)C-Ni and (Ti,W)(CN)-Ni powders synthesized from oxides were sintered to produce ultra-fine cermets with homogeneous microstructures. The sintered microstructure at 1510℃ for 1hr demonstrated an ultra-fine, coreless (Ti,W)C or (Ti,W)(CN) rim phase, 0.5～0.8μm in diameter. In this study the effect of WC presence on the coarsening of the solid solution phases. (Ti,W)(CN) seems to grow faster than (Ti,W)C during the powder synthesis. However, the (Ti,W)(CN) and (Ti,W)C solid-solution phases showed a similar coarsening tendency during sintering.