各種焼結助剤添加ホットプレスTiNセラミックスの機械的特性

概要

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The effect of additives on the densification and strengthening of titanium nitride (TiN) ceramics has been described. The additives studied were oxides (Al_2O_3, Y_2O_3 and MgO), nitrides (BN, AlN and Si_3N_4) and carbides (SiC and B_4C). The TiN compacts containing 5 and 10 wt% additives were hot-pressed at 1950℃ for 60 min (except for Si_3N_4) in the ambient Ar gas of normal pressure. Additions of 10 wt% Al_2O_3, 10 wt% Y_2O_3 and 10 wt% B_4C gave the relative densities of 97.4, 96.2 and 97.7%, respectively. The mechanical and electrical properties are as follows: 10 wt% B_4C increased the hardness; 5 wt%BN the flexural strength; 10 wt% B_4C or 10 wt% Y_2O_3 the values of fracture toughness (K_<IC>); 10 wt% Al_2O_3 or 10 wt% B_4C the Young's modulus and the rigidity; 10 wt% B_4C the electrical conductivity. As a whole, 10 wt% Al_2O_3, 10 wt% Y_2O_3 and 10 wt% B_4C additives contributed to both densification and strengthening. The most promising additive is 10 wt% B_4C for TiN ceramics from the view point of relative density, mechanical and electrical properties, and prevention of grain growth.
社団法人日本セラミックス協会の論文
1993-03-01