Residual stress variation in SiCf/SiC composite during heat treatment and its effects on mechanical behavior

Journal of Advanced Ceramics

Guofeng Cheng¹  Haijun Zhou²  Xiaowu Chen²  Chunjin Liao²  Hongda Wang²  Xiangyu Zhang²  Shaoming Dong²  Junmin Zhang³  Feiyu Guo³ 

[1] Analysis and Testing Center for Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 200050, Shanghai, China;State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 200050, Shanghai, China;Structural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 200050, Shanghai, China;State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 200050, Shanghai, China;Structural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 200050, Shanghai, China;School of Physical Science and Technology, ShanghaiTech University, 200031, Shanghai, China;

关键词: residual stress;    nano-powder infiltration and transient eutectoid (NITE);    Raman spectroscopy;    mechanical properties;   

DOI  :  10.1007/s40145-020-0395-4

来源: Springer

【 摘 要 】

Residual stress originated from thermal expansion mismatch determines the mechanical properties of ceramic matrix composites (CMCs). Here, continuous SiC fiber reinforced SiC matrix (SiCf/SiC) composites were fabricated by nano-infiltration and transient eutectic-phase (NITE) method, and the residual stress of the composites was investigated using high-temperature Raman spectrometer. With temperature increasing from room temperature to 1400 °C, the residual stresses of the matrix and the fiber decrease from 1.29 to 0.62 GPa and from 0.84 to 0.55 GPa in compression respectively, while that of the interphase decreases from 0.16 to 0.10 GPa in tension. The variation of residual stress shows little effect on the tensile strength of the composites, while causes a slight decrease in the tensile strain. The suppression of fiber/matrix debonding and fiber pulling-out caused by the residual stress reduction in the interphase is responsible for the decreasing tensile strain. This work can open up new alternatives for residual stress analysis in CMCs.

【 授权许可】

CC BY