| 摘要 |
PURPOSE:To enable provision of the title sintered compact consisting essentially of boron carbide capable of readily preparing also in complicate shape, by adding titanium boride and zirconium boride to boron carbide at specific amounts. CONSTITUTION:The aimed sintered compact containing >=11wt.% TiB2 or/and ZrB2 and <=89wt.% B4C. The TiB2 and ZrB2 have both melting point and hardness comparable to that of B4C and are effective to preparing B4C ceramics reduced in fault and simultaneously enable processing of sintered compact because of having excellent conductivity. Conductivity of the sintered compact is insufficient in <=10% amounts of the both compounds or <=10% amount of either one compound and the sintered compact contains preferably <=70% and especially preferably <=50% of the above-mentioned compounds in order to secure hardness and toughness of B4C. In the case of B4C content of >=90%, conductivity of the sintered compact is reduced, though B4C is a main ingredient required for obtaining high hardness ad toughness. |
