高温氧化气氛下3D C/SiC质量变化率与剩余强度的相关性

Relationship between mass variation and residual strength change with temperature on 3D C/SiC composites in oxidizing atmosphere

通过三维编织炭纤维增强碳化硅基复合材料(3D C/SiC)在各种氧化气氛中的环境实验,研究了氧化气氛中材料的质量变化率和剩余强度随温度变化规律及其相关性。根据3D C/SiC复合材料各组元的作用,对其微观组织及炭纤维预制体的氧化损伤演变进行了分析。结果表明,在各个氧化温度区间内,3D C/SiC质量变化率与剩余强度随温度变化的规律基本相同,两者结果相互对应。对于3D C/SiC,用质量变化率作为对环境损伤敏感性表征的一个基本指标,比用剩余强度表征更科学可靠。

3D-braided carbon fiber reinforced silicon carbide ceramic matrix composites （3D C/SiC） were investigated on the environmental properties in various oxidizing atmosphere. The mass variation and the residual strength as a function of the temperature were determined. Based on the architecture and microstructure, the contributions of the constituents in 3D C/SiC to properties and its evolving were analyzed. The results show that the mass variation with temperature correlates well with the residual strength change with temperature. Therefore, the mass variation is more fundamental and reliable for material characterization in simulating environments than the residual strength.