TiB<SUB>2</SUB>-TaB<SUB>2</SUB>基サーメットの機械的性質に及ぼす結合剤の影響
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This paper describes, firstly, the effects of the sintering temperature on the mechanical properties of TiB<SUB>2</SUB>-5%TaB<SUB>2</SUB>-1%CoB, TiB<SUB>2</SUB>-5%TaB<SUB>2</SUB>-1%NiB, TiB<SUB>2</SUB>-5%TaB<SUB>2</SUB>-1%FeB and TiB<SUB>2</SUB>-5%TaB<SUB>2</SUB>-1%Co alloys; secondary, the effects of the amount of binders on those of TiB<SUB>2</SUB>-5%TaB<SUB>2</SUB>-CoB, TiB<SUB>2</SUB>-5%TaB<SUB>2</SUB>-NiB and TiB<SUB>2</SUB>-5%TaB<SUB>2</SUB>-FeB alloys. The results were as follows:<BR>1. CoB was the best binder for TiB<SUB>2</SUB>-TaB<SUB>2</SUB> based cermets. The TiB<SUB>2</SUB>-5%TaB<SUB>2</SUB>-1%CoB alloys sintered at the temperature of 1700 to 1900°C for 28 min under 200 kg/mm<SUP>2</SUP> in a vacuum had the transverse rupture strength of 95 kg/mm<SUP>2</SUP>, and scarcely had pores.<BR>2. In the cases of CoB, NiB and FeB binders, TiB<SUB>2</SUB>-TaB<SUB>2</SUB> based cermets had a solid solution between TiB<SUB>2</SUB> and TaB<SUB>2</SUB>. However, TiB<SUB>2</SUB>-5%TaB<SUB>2</SUB>-1%Co sintered body scarcely had the solid solution between TiB<SUB>2</SUB> and TaB<SUB>2</SUB>.<BR>3. The binder phases of TiB<SUB>2</SUB>-5%TaB<SUB>2</SUB>-1%CoB alloy and TiB<SUB>2</SUB>-5%TaB<SUB>2</SUB>-1%FeB alloy may be CoB and FeB, respectively. The binder phases of TiB<SUB>2</SUB>-5%TaB<SUB>2</SUB>-1%NiB alloy may consist of NiB and monoclinic Ni<SUB>4</SUB>B<SUB>3</SUB> and unknown phases. Also TiB<SUB>2</SUB>-5%TaB<SUB>2</SUB>-1% CoB alloy may have the binder phases of CoB and Co<SUB>2</SUB>B.
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