Effect of environmental pressure on the microstructure of YSZ thermal barrier coating via suspension plasma spraying. Issue 1 (January 2021)

• Record Type: Journal Article
• Authors: Xie, Shiming; Song, Chen; Yu, Zexin; Liu, Shaowu; Lapostolle, Frédéric; Klein, Didier; Deng, Chunming; Liu, Min; Liao, Hanlin
• Is Part Of: Journal of the European Ceramic Society. Volume 41:Issue 1(2021)
• Page Start: 535
• Page End: 543
• Publication Date: 2021-01
• Subjects: Thermal barrier coatings -- Suspension plasma spray -- Environmental pressure -- Coating microstructure; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2020.08.022
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Suspension plasma spraying (SPS) as a potential technique to prepare thermal barrier coatings (TBCs) has been attracting more and more attention. However, most reports on SPS were carried out in the atmosphere. Given the unique features of in-flight particles and plasma jets under low pressure, the resulting coatings are expected to be different from those under atmospheric pressure. In this article, yttria-stabilized zirconia (YSZ) thermal barrier coatings were prepared using suspension plasma spraying under different environmental pressures. The results show that as the environmental pressure decreased, the column-like structural coating turned into a vertical crack segmented structure, as well as a dramatic decrease in surface roughness. More nanoparticle agglomerates were formed in the coating under lower environmental pressures. The real porosity of the coating increased with a decrease in environmental pressure.