アルミナ-ムライトウイスカー複合体の機械的性質

概要

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Composite alumina ceramics with a mullite whisker content of up to 30 vol% were fabricated by hot-pressing at 1400 to 1600℃ under 30 MPa for 30 min. The bending strength, hardness, elastic modulus and fracture toughness of the hot-pressed bodies were investigated. Considerably dense alumina-mullite whisker composite ceramics were obtained by sintering at 1600℃ with a whisker content of up to 30 vol%. The composite with a whisker content of 10 vol% and sintered at 1600℃ exhibited the highest room temperature bending strength of around 750 MPa. This value is still lower than the maximum strength of alumina ceramic which is about 850 MPa. However, the composites exhibited greater high temperature strength and hardness than alumina. The elastic modulus decreased with an increase in whisker content. No improvement was observed in the fracture toughness of the alumina by the addition of mullite whiskers, as very little crack deflection by the whiskers and pull-out of the whiskers occurred in these composites.
社団法人日本セラミックス協会の論文
1993-06-01