陰イオン置換型 ZrN_<1-x>C_xとTaN_<1-x>C_x焼結体の作成(<小特集>セラミック材料小特集)

概要

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An attempt was made to fabricate ZrN_<1-x>C_x and TaN_<1-x>C_x (0 < x < 1.0) ceramics without additives in order to obtain highly pure and dense polycrystalline anion-substituted materials by high pressure reaction hot-pressing. Compositional and temperature dependences of Vickers micrlhardness, fracture toughness and thermal conductivity of ZrN-ZrC and TaN-TaC systems were examined. The compositional dependence of lattice constant of ZrN_<1-x>C_x obeyed Vegard's law. The full solid solution of TaN_<1-x>C_x could not be synthesized, but a partial solid solution system with the composition range of 0.3 < x < 1.0 was prepared. The microhardness of ZrN_<1-x>C_x decreased with increasing nitrogen content, but the microhardness of TaN_<1-x>C_x increased with nitrogen content. The fracture toughness of ZrN_<1-x>C_x decreased linearly from 4.6 to 3.3 MN/m^<3/2> with increasing mole fraction X. Little change in K_<Ic> was 4.5 MN/m^<3/2>. The thermal conductivity of ZrN_<1-x>C_x at room temperature decreased continuously with increasing X. But the thermal conductivity of TaN_<1-x>C_x decreased rapidly with increasing carbon content and reached the minimum value at TaN_<0.5>C_<0.5> and then increased with increasing amount of carbon.
社団法人日本材料学会の論文
1984-11-15