Abstract
Alumina/aluminum/silicon composites were fabricated by reaction between aluminum and Amakusa pottery clay (“Amakusa”). On heating the “Amakusa” powder compact contacting with aluminum, reaction occurred above 1473K. Sintering the “Amakusa” compact at 1623K before the reaction lowered the reaction temperature to 1173K and increased the reaction rate. Three kinds of composites obtained from the “Amakusa” compact, the sintered body and the sintered body containing alumina powder (20mass%), named C (A), C (B) and C (C), respectively, were characterized. They contained -10vol% of metal phase and showed microstructure with three-dimensionally interconnected metal phase. Their relative densities were 94-99%. The bending strength of the composites, C (A), C (B), and C (C), were 143, 210 and 240MPa, respectively. Their fracture toughnesses were 2.3, 3.9, and 4.3MPa·m1/2, respectively.
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