Interfacial Shear Strength of Aluminum-Ceramic Composites.
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概要
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In order to investigate a fabrication process for high strength aluminum=ceramic composites (Al-Al<SUB>2</SUB>O<SUB>3</SUB>, Al-Si<SUB>3</SUB>N<SUB>4</SUB>, Al-SiC), the composites were made by inserting the ceramic rods into molten aluminum at 1173K for various times up to 7.3ks. The relation between the structure and shear strength of the aluminum-ceramics interface in the composites was investigated. The shear strength was determined from resistance for shear deformation at the aluminum-ceramics interface. It was found that except for Al-Al<SUB>2</SUB>O<SUB>3</SUB>, the reaction layers of Al<SUB>4</SUB>C<SUB>3</SUB> and AIN are formed at the interface regions of Al-SiC and Al-Si<SUB>3</SUB>N<SUB>4</SUB>, respectively and that the strength depends on the thickness and morphology of the rection layers. The optimum strength is obtained by heating at 1173K for 0.9-1.2ks, which is about 3-4 times that estimated for shear strength of alumimum matrix. The strength is higher in order of Al-Al<SUP>2</SUP>O<SUB>3</SUB>, Al-Si<SUB>3</SUB>N<SUB>4</SUB> and Al-SiC.
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