Mo2FeB2系硬質合金の液相焼結機構におよぼすMo添加量の影響

概要

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The liquid phase sintering of an Fe-6 wt%B-(38-53) wt%Mo ternary alloys is studied by means of DTA, dilatometric measurements, microstructural observations and transverse rupture testing. Effects of Mo content on the liquid phase sintering are discussed. Also, the relationship between the sintering mechanisms and transverse rupture strength of Fe-6 wt%B-48 wt%Mo alloy is discussed. The results can be summarized as follows: The liquid phase sintering of the alloy is accomplished by the formation of two liquid phases produced by two different reactions. As the Mo content increases, the temperature range of the first reaction, γ-Fe+Fe2B→L1, falls slightly and the amount of L1 decreases. On the other hand, the temperature range of the second reaction, γ-Fe+Mo2FeB2→L2, rises up to 1282°C with an attendant increase in the amount of L2.