TiB₂系セラミックスの機械的特性に及ぼすMo₂CoB₂,TiH₂およびTiC_0.7N_0.3添加の効果

抄録

The addition of Mo₂CoB₂ and TiH₂to the TiB₂ improved the density, the bending strength and other properties. Especially, the additions of 15wt %Mo₂CoB₂ and 2wt %TiH₂ brought the highest bending strength as 149 kgf/mm² and high hardness as HV2 800. Sliding wear test against mild steel showed that TiB₂-TiH₂-Mo₂CoB₂ ceramics have relatively little specific wear rates compared with SiC, Si₃N₄, ZrO₂ but have large specific, wear rates compared with Al₂O₃ and cemented carbides (D10). Specific wear rates of TiB₂ based ceramics could be decreased less than Al₂O₃ and cemented carbides (D10) by the addition of TiC_0.7N_0.3 without lowering the bending strength. Furthermore this ceramics have good abrasive wear resistance.