2726 C/Cコンポジットの高温クリープ特性(S28-1 セラミックスおよびセラミックス系複合材料(1),S28 セラミックスおよびセラミックス系複合材料)

抄録

Creep behavior of carbon-carbon (C/C) conposite was investigated through high temperature creep tests, where temperatures were T=800℃ and 1000℃ and stress level was in the range from 90% to 95% of tensile strength at room temperatre. Primary creep and secondary behaviors were shown in the ceep curve in each test condition. The minimum creep rate which was obtained from the creep curve in the secondary creep stage exhibited a dependence on both of the temperature and the stress level. After the creep tests, the fracture site and the specimen surface were observed to investigate the mechanism of the creep fracture. The multiple fracture in 90° layer, which caused in earlier stage in creep, could induce the debonding at the interface between 0° and 90° layers, and finally tensile fracture occurred in the 0° layer. The configuration of fracture surface in creep was almost flat.