TiNとB_4C粉末の固相反応を利用したホットプレス法による高強度 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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TiB_2-TiN_xC_y composite ceramics with high density, mechanical strength and electrical conductivity were prepared by the hot-pressing method with the solid phase reaction of TiN with B_4C powder. The TiN powder contailling 0-20 mass%B_4C-additives was hot-pressed at 1950℃ for 3.6 ks under a pressure of 31.2 MPa in ambient Ar gas. The 42.9 mass%TiB_2-TiN_xC_y composite derived by the addition of 16 mass%B_4C to TiN had a relative density of 98.9%, hardness of 25.4 GPa, flexural strength of 850 MPa, fracture toughness (K_<1c>) of 9.5 MPa・m^<1/2>, Young's modulus of 505 GPa and electrical conductivity of 5.4 MS・m^<-1>. This composite showed excellent mechanical properties comparable with those of hot-pressed Si_3N_4 or SiC ceramics and an electrical conductivity comparable with metal. The composite is expected to be used as a ceramic mold material that can be machined by electrical discharge, corrosion-resistant electrode components, and electro-conductive high-temperature structural materials.
社団法人日本セラミックス協会の論文
1998-08-01