炭化ケイ素ウイスカー強化結晶化ガラス複合材料の機械的性質

概要

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Flexural strength, Young's modulus, Vickers hardness and fracture toughness of SiC whisker reinforced glass ceramics (diopside, anorthite and cordierite) were measured. Maximum strengths of these composites were 550 MPa for 30 vol% whisker-diopside, 427MPa for 25 vol% whisker-anorthite and 391 MP a for 30 vol% whisker-cordierite. Young's modulus and Vickers hardness of the composites increased with increasing whisker contents, exhibiting maximum at 25-30 vol% whisker. While they decreased with more whisker contents. Apparent fracture toughness of SiC whisker-glass ceramic composites obtained by the indentation fracture technique was dependent on the indenter load. The maximum values of fracture toughness at indenter load of 10 kg were 4.53 MPa・m^<1/2> for 40 vol% whisker-diopside, 4.37 MPa・m^<1/2> for 30 vol% whisker- cordierite and 4.13 MPa・m^<1/2>for 25 vol% whisker-anorthite. It was assumed that the strengthening mechanism of SiC whisker-glass ceramic composites was load transfer. While, it was suggested that the toughening mechanisms of these composites were whisker pullout, crack deflection and load transfer to whisker for diopside glass ceramics, and crack deflection and load transfer for anorthite glass ceramics, and load transfer to cordierite glass ceramics.
社団法人日本セラミックス協会の論文
1989-08-01