B_4CとTiN粉末の反応によるTiB_2-TiN_xC_y複合焼結体の作製とその機械的特性

概要

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The TiB_2-TiN_xC_y composite ceramics, which have hardnesses and electrical conductivities, and can be used for electric discharge machining, were fabricated by the reaction sintering of B_4C and TiN powders. The TiN powders containing 0-20 mass% B_4C-additives were pressed under a pressure of 100 MPa, and then sintered at 2100℃ for 3.6 ks in an ambient Ar gas of normal pressure. As a result, the 27.5 mass% TiB_2-TiN_xC_y composite, for example, was obtained by the reaction sintering of TiN powders containing 8 mass% B_4C-additive. The composite had a maximum relative density of 96.1% and showed improved hardness by 〜 1.5 times, fracture toughness of K_<IC> by 〜 1.7 times, Young's modulus by 〜 1.3 times, electrical conductivity by 〜 1.7 times compared with those of pure TiN ceramics with a relative density of 87.7%. The hardness and electrical conductivity of the 67.0 mass% TiB_2-TiN_xC_y composite obtained from the TiN powders containing 20 mass% B_4C-additive were 2.0 and 2.2 times higher than those of pure TiN ceramics, respectively, in spite of the lower relative density of 90.9%.
社団法人日本セラミックス協会の論文
1996-04-01