Durable protection and failure mechanism of the multilayer coating system for SiCf/SiC composites under high-temperature oxidation. (September 2022)

• Record Type: Journal Article
• Authors: Quan, Huafeng; Wang, Lianyi; Huang, Juntong; Luo, Hao; Zheng, Kai; Yang, Huiyong; Yang, Xiaotian; Dong, Xiaohui; Cui, Guangyuan; Song, Jiaqi; Luo, Ruiying
• Is Part Of: Composites. Number 244(2022)
• Publication Date: 2022-09
• Subjects: SiCf/SiC composites -- Coating -- Failure mechanism -- UDM model -- Raman stress; Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2022.110197
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: In this study, a thermal protective coating system was developed for addressing the durable high-temperature application of SiCf /SiC composites under 1200–1400 °C oxidation. The results show that the coated SiCf /SiC samples are almost no degradation on their mechanical strengths, as high as 630–749 MPa after the static oxidation and 585–719 MPa after the H2 O/O2 /Na2 SO4 corrosion oxidation. The lattice strain and the stress distribution in the coating was analyzed and evaluated. It is illustrated that there is inhomogeneous stress and stress migration in the coating, and its excellent thermal protection performance mainly benefits from the formation of dense heterogeneous oxide scale, the mass transfer of liquid convection and the strain compatibility of ZrSiO4 . Highlights: Compact preparation of UHTC coating at relatively low temperature. Excellent thermal protective property for SiC/SiC composites at high temperature. Evolution on the lattice strain in the coating was investigated by W–H analysis. Evolution on stress distribution in the coating was extracted by Raman spectra.