Al_2O_3-Si_3N_4ウイスカー系複合セラミックスのち密化と二,三の機械的特性

概要

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a-Al_2O_3-β-Si_3N_4 whisker composite ceramics with a whisker content of 20 wt% were prepared by hot-pressing at prescribed temperature between 1300°-1800℃C for 30 min under the pressure of 30 MPa. Fairly dense composites were obtained at sintering temperature above 1500℃. The composites obtained below 1700℃ are consisted of a-Al_2O_3 and β-Si_3N_4, while β'-sialon was produced in the composite sintered at 1800℃. The composite fired at 1600℃ had a bending strength of about 620 MPa, whose value was 50% larger than that of hot-pressed Al_2O_3 at the same sintering temperature, but could not exceed the maximum bending strength of monolithic Al_2O_3(about 830 MPa) . The fracture toughness(4.3-4.8 MPa・m^<1/2>) was one and half times as large as that of Al_2O_3 sintered at 1400°-1600℃.
社団法人日本セラミックス協会の論文
1989-11-01