TiC-Co-Mo系合金の反応焼結過程
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概要
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The reaction and sintering processes in the preparation of TiC-12%Ni-12%Mo and TiC-12%Co-12%Mo cermets were studied by X-ray analysis, microscopy and measurements of the mechanical properties. As results, it was obtained that these processes, such as carbonization of Mo, diffusion of Mo to TiC, and solution of TiC to binder, are not substantially different in both the Ni and Co binder cermet. However, since the eutectic temperature (about 1370°C) of TiC-Co is higher than that (about 1280°C) of TiC-Ni, the densification of sintered body was slower in the Co binder cermet and completed at 1350° and 1400°C for the Ni and Co binder cermets, respectively.<BR>On the other hand, grain growth of carbide began at about 1400°C in both the Ni and Co binder cermets. Therefore the optimum sintering temperature range is narrower in Co binder than in Ni binder cermet.
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