On Each Phase Composition of TiC-Ni Cermet

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  • Niki Eiji
    Institute of Space and Aeronautical Science, University of Tokyo
  • Masato Kazuo
    Institute of Space and Aeronautical Science, University of Tokyo

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  • TiC-Niサーメットの各相の組成について
  • TiC-Ni サーメット ノ カク ソウ ノ ソセイ ニ ツイテ

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Abstract

Each phase of TiC-Ni cermet was studied by means of electrolytic separation and chemical analysis, X-ray diffraction and micro-hardness measurement, with the following results:<BR>The solubility of TiC in Ni phase was determined to be 2.7Ti+C, 3.4Ti+C and 5.3Ti+C (in wt%) at 1200°, 1250° and 1300°C, respectively. Although it is considered that Ti dissolves substitutionally in Ni and C dissolves interstitially in it, but the content of C in the solid solution is considerably small as compared with that of Ti. Thus, it is reasonable to consider that free C is present in the phase of the vertical section between Ni and stoichiometric TiC in the Ni-Ti-C system. And it appears that Ni dissolves substitutionally in TiC.<BR>The lameller deposit observed in about 90%Ni composition is TiC (a0=4.317 Å). The micro-hardnesses (Hv, 25 g Load) of the Ni and TiC phases were measured to be about 280 kg/mm2 and about 3200 kg/mm2, respectively.

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