サイアロン/SiCウイスカー複合体の室温疲労特性

概要

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Sialon/SiC whisker composites with 5 and 10 mass% SiC (w) were prepared by hot-isostatic-pressing. The fatigue behavior of composites at room temperature in air was investigated. Dynamic, static and cyclic fatigue tests were carried out on smooth specimens by the 3-point bending method. The microstructure, bending strength and fracture toughness of composites were similar to those of monolithic sialon. The addition of SiC (w) inhibited the slow crack growth attributable to the stress corrosion by humidity in air observed in monolithic sialon. The dynamic fatigue parameter "n" was 26 in monolithic material, 108 in composite with 5 mass % SiC(w) and 90 in 10 mass % SiC (w) . In static fatigue tests, the observed lifetime of each sample was in agreement with that predicted from dynamic fatigue properties. The acceleration of fatigue was observed in monolithic sialon and composite with 5 mass % SiC (w) , but the addition of 10 mass % SiC (w) reduced the accelerative effects on cyclic fatigue.
1996-08-01