Si含浸SiC材の高温破壊強度特性とその統一的評価

概要

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The aim of this paper was to study the applicability of a unified estimation method for evaluating strength of silicon impregnated silicon carbide. For this purpose, various kinds of bending tests, such as fast fracture tests, cyclic fatigue tests and creep fatigue tests, were carried out. The testing temperature conditions were 1100℃, 1200℃ and 1300℃ in atmosphere. Other temperature conditions of room temperature, 1000℃ and 1350℃ in atmosphere were added only in fast bending tests. The strength date obtained were analyzed by use of a unified estimation method. The results obtained are as follows : (1) The unified estimation method can be applied to the strength evaluation of silicon impregnated silicon carbide at 1100℃, 1200℃ and 1300℃. (2) The temperature dependence of bending strength was different below and above 1300℃. Above 1300℃, the bending strength decreased with increasing temperature. (3) Crack growth rate index of silicon impregnated silicon carbide was obviously larger than that of silicon nitride from 1100℃ to 1300℃.
社団法人日本材料学会の論文
1992-07-15