Mo2FeB2系硬質合金の焼結機構におよぼす炭素量の影響

概要

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The liquid phase sintering of Fe-6wt.%B-48wt.%Mo-(0.01-0.55)wt.%C alloys is studied by means of DTA, dilatometric measurements and microstructural observations. The results can be summarized as follows. (1) The liquid phase sintering of the alloy is basically accomplished by the formation of two liquid phases produced by L1 and L2 reactions, that is γ-Fe+Fe2B→L1 and γ-Fe+Mo2FeB2→L2, when carbon content in the sintered alloy is very few. As carbon content increases, an another liquid phase reaction, γ-Fe+Fe3C→Lc, adds to L1 and L2, which lies slightly below the temperature range in which L1 reaction occurs. (2) In proportion to the increase of carbon content, the temperature ranges of Lc, L1 and L2 shift to lower temperature. (3) When carbon content is in the range of 0.01-0.55wt.%, the optimum sintering temperature lies slightly above the temperature at which L2 reaction cocurs.