抄録
The titanium nitride or titanium carbonitride has generally been used for the preparation of nitrogen contained TiC-Mo2C-Ni systems. However, the structure difference between TiC-TiN-Mo2C-Ni and Ti(C, N)-Mo2C-Ni cermets seems not to have been clarified. Then, the study on this subject was made, using TiC-(18, 30)mass%TiN-20 mass%Mo2C-20 mass%Ni and Ti(C0.7N0.3) or Ti(C0.5N0.5)-20 mass%Mo2C-20 mass%Ni cermets. The following results were thought to be of great importance. The structure became finer in both cermets with increasing nitrogen content and the structure of (TiC+TiN) based cermets was considered to be finer than that of Ti(C, N) based cermets. In the former cermets, coarse carbides and carbonitrides (called CSS), and extremely fine carbides and carbonitrides (called EFC) co-excited in the structure. The average grain size of those cermets was controlled by the amount of CSS and EFC.
