ホットプレス法によるTiB2-ZrB2系セラミックス焼結体の作製とその機械的特性

概要

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The TiB_2-ZrB_2 ceramic system, which have high hardnesses and electrical conductivities, were sintered by the hot-pressing method from the mixed powders of TiB_2 and ZrB_2. The mixed powders with the compositions from TiB_2 to ZrB_2 (0.2mol step) were calcined at 1450℃ and then hotpressed at 2000℃ for 3.6ks under a pressing pressure of 32MPa in ambient Ar gas of normal pressure. As a result, the system had the solid solutions between TiB_2 and ZrB_2 crystal structures. The (TiB_2)_0.6(ZrB_2)_0.4 ceramics, for example, had the relative density of 96.5%, hardness of 33GPa, flexural strength of 354MPa, fracture toughness (K<IC>) of 3.87 MPa m<1/2> and Young's modulus of 449GPa. The ceramics is expected to use as ceramic mold materials that can form with electrical discharge machine, corrosion-resistant electrode materials, and electro-conductive hightemperature structural materials.
長野工業高等専門学校の論文