期刊
CERAMICS INTERNATIONAL
卷 45, 期 5, 页码 5801-5807出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.12.048
关键词
Environmental barrier coatings; Ceramic matrix composite; Suspension plasma spray; Silicon carbide
资金
- Strategic Core Material Technology Development Project of the Ministry of Trade, Industry and Energy, Rep. of Korea [10065691]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10065691] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In high-speed modern industries, high-temperature stability of materials is essential. A promising high-temperature material currently attracting attention is silicon carbide (SiC)-based ceramic matrix composites (CMC). However, a disadvantage of these materials is their reduced lifetime in an oxidizing atmosphere. To overcome this, environmental barrier coating can be employed. In this study, we aimed to fabricate an environmental barrier coating using suspension plasma spray with Yb2Si2O7, which exhibits excellent oxidation resistance and a similar thermal expansion coefficient to SiC. To prepare the crystalline Yb2Si2O7 coating layer, the gas concentration of the plasma spray was adjusted, and then the suspension manufacturing solvent was adjusted and sprayed. The prepared coating samples were analyzed by X-ray diffraction, scanning electron microscope, transmission electron microscopes, and energy dispersive X-ray spectroscopy to determine phase and microstructure changes. Highly crystalline ytterbium disilicate was observed at low plasma enthalpy with no hydrogen and 20% addition of water.
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