PVD法によってTi(C,N)を被覆したTi(C,N)-Mo2C-Niサーメットの性質

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The Ti(C, N) layer (C/N ≈ 4/6) was deposited by PVD process at 573-853K on the TiC0.7N0.3-Mo2C-Ni substrates having transverse-rupture strength as high as 2.5-2.8 GPa. The interface structure between layer and substrate, transverse-rupture strength, residual stresses in the layer, cutting performance, etc. were studied for the PVD coated specimens. The η phase did not appear near the interface even after annealing the coated specimens. The strength of coated specimens was the same as that of substrate when the PVD temperatures became lower. The strength of specimens sharply decreased by annealing with increasing the annealing temperature. These results on the strength were almost similar to those in case of coated WC-Co alloys previously reported. The strength of coated alloys, i.e. coated cermets and cemented carbides, was well explained, considering the facts that residual compressive stresses were produced in the layer and they varied according to the PVD and annealing temperatures. It was proved that cutting performance of coated specimens was superior to that of uncoated specimens.
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