TiC-Ni系焼結合金の金属結合相の構造と性質

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  • Study on the Structures and Properties of Binder Phase of TiC-Ni Cermet
  • TiC-Niケイ ショウケツ ゴウキン ノ キンゾク ケツゴウソウ ノ コウゾウ ト セイシツ

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The structures and the properties of binder phase of 70%TiC-30%Ni composition sintered at various temperatures for 1 hr in hydrogen have been investigated by means of X-ray diffraction and thermomagnetic analysis. At about 800°C, titanium carbide begins to diffuse into nickel, the solubility of TiC increased up to 1.5% with rise of the sintering temperature below eutectic temperature and about 1% of TiC remained in binder phase of the alloy sintered above eutectic temperatures. Free carbon content increased gradually during the sintering up to 0.9% by weight, therefore we considered that carbon precipitates during the sintering process of TiC-Ni composition. It was also pointed out that the binder of TiC-Ni cermet must contain excess titanium, and actually, precipitation of graphite in binder phase was observed on the microstructure of TiC-Ni composition sintered above eutectic temperatures. Therefore, in the process of sintering TiC-Ni cermet precipitation of free carbon must be strictly avoided. From this point of view, it has been proposed to add some metal powders, such as molybdenum which combines easily with carbon. It wasfound that molybdenum metal is very suitable for this purpose.

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