期刊
CERAMICS INTERNATIONAL
卷 43, 期 16, 页码 13075-13082出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.06.167
关键词
EBC; SiCf/SiC; Al-modification; Oxidation resistance; Thermal shock resistance
资金
- Guangdong Academy of Sciences [2017GDASCX-0843]
- Guangdong Technical Research Program [201313050800031, 201413050502008, 2014B070706026, 2013B061800053]
- Guangdong Natural Science Foundation [2016A030312015]
- National Natural Science Foundation of China [51501044]
- Guangzhou Technical Research Program [201707010385]
SiCf/SiC ceramic matrix composites (CMCs) are being widely used in the hot-sections of gas-turbines, especially for aerospace applications. These CMCs are subjected to surface recession if exposed to heat-corrosion. In this research, an alternative environmental barrier coating (EBC) is introduced to protect the SiCf/SiC CMC from high temperature degradation that is, Al film was deposited on the surface of SiCf/SiC CMC followed by heat treatment in a vacuum. After that, a dense Al2O3 overlay was in-situ synthesized on the surface of CMC, and in this process the microstructure evolution of SiCf/SiC CMC was analyzed. The oxidation and thermal shock resistance were characterized, showing that the Al-modified SiCf/SiC CMC has a better oxidation resistance, because the dense Al2O3 overlay can hinder oxygen diffusion from environment. What is more, the water quenching testes show that the AI-modified SiCf/SiC CMC has a good spallation resistance.
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