炭化チタンウイスカー/アルミナ系複合体の焼結と機械的特性

概要

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Composite ceramics of alumina mixed with up to 30 vol% titanium carbide whiskers were fabricated by hot-pressing at 1400 to 1700℃ under 30 MPa for 30 min. The mechanical properties of the hot-pressed bodies were studied. Dense composites with relative densities above 98% were obtained at 1600℃ when the whisker content was up to 30 vol%. The composite containing 10 vol% whiskers and fired at 1500℃ showed the highest bending strength of around 510 MPa, which is lower than the maximum strength of alumina, around 650 MPa. These composites are superior to monolithic alumina in high temperature bending strength and Vickers hardness. Increasing whisker content decreased the elastic modulus monotonously, but increased the fracture, toughness from around 3.5 MPa・m^<1/2> for alumina to around 5.7 MPa・m^<1/2> for composite ceramics containing 30 vol% whiskers.
社団法人日本セラミックス協会の論文
1995-05-01