Journal
JOURNAL OF ADVANCED CERAMICS
Volume 9, Issue 5, Pages 567-575Publisher
SPRINGER
DOI: 10.1007/s40145-020-0395-4
Keywords
residual stress; nano-powder infiltration and transient eutectoid (NITE); Raman spectroscopy; mechanical properties
Categories
Funding
- National Natural Science Foundation of China [51902328]
- Science and Technology Commission of Shanghai Municipality [19ZR1464700]
- Key Program of the Chinese Academy of Sciences [ZDRW-CN-2017-1]
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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 degrees 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.
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