Preparation of crystalline ytterbium disilicate environmental barrier coatings using suspension plasma spray. Issue 5 (1st April 2019)

• Record Type: Journal Article
• Authors: Ryu, Ho-lim; Lee, Sung-Min; Han, Yoon-Soo; Choi, Kyun; An, Gye Seok; Nahm, Sahn; Oh, Yoon-Suk
• Is Part Of: Ceramics international. Volume 45:Issue 5(2019)
• Page Start: 5801
• Page End: 5807
• Publication Date: 2019-04-01
• Subjects: Environmental barrier coatings -- Ceramic matrix composite -- Suspension plasma spray -- Silicon carbide; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.12.048
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: 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 Yb2 Si2 O7, which exhibits excellent oxidation resistance and a similar thermal expansion coefficient to SiC. To prepare the crystalline Yb2 Si2 O7 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.