Residual stress originated from thermal expansion mismatch determines the mechanical properties of ceramic matrix composites (CMCs). Here, continuous SiC fiber reinforced SiC matrix (SiC_f/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.

由热膨胀失配引起的残余应力决定了陶瓷基复合材料（CMC）的机械性能。在此，连续SiC纤维增强SiC基体（SiC _f/ SiC）复合材料通过纳米渗透和瞬态共晶相（NITE）方法制备，并使用高温拉曼光谱仪研究了复合材料的残余应力。随着温度从室温升高到1400°C，基体和纤维的残余应力在压缩时分别从1.29 GPa降低至0.62 GPa和从0.84到0.55 GPa降低，而相间的残余应力在拉伸时从0.16 GPa降低至0.10 GPa。残余应力的变化对复合材料的拉伸强度几乎没有影响，而导致拉伸应变略有下降。由于相间残余应力的减少而抑制了纤维/基体的脱粘和拉出，是导致拉伸应变降低的原因。