Corrosion behavior of LSI-based 3D needled C/SiC composites subjected to burner rig test. (1st April 2022)

• Record Type: Journal Article
• Authors: Duan, Junjie; Li, Yangjie; Li, Feng; Chen, Pengju; Xiao, Peng; Li, Yang
• Is Part Of: Corrosion science. Volume 197(2022)
• Publication Date: 2022-04-01
• Subjects: C/SiC -- Morphology evolution -- Burner rig test -- Corrosion mechanism; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109982
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: The C/SiC composites prepared by liquid silicon infiltration(LSI) were tested on a burner rig at approximately 1400 °C with flame velocity of 30–50 m/s. The microstructural morphologies before and after tests are analyzed to propose corrosion mechanisms. The corrosion behavior of C/SiC under high-temperature and high-velocity flame conditions is divided intofollow three stages which are repeated during whole tests: (1) removal of carbon fiber and pyrolytic carbon on surface; (2) shedding of matrix on the surface; (3) shedding of chopped fiber web layers. Moreover, the melt and volatilization of SiO2 which is the oxidation product of SiC, and the thermal stress induced fracture under high-temperature and high-velocity flame impacting are proposed as main mechanisms of the SiC matrix shedding. Highlights: C/SiC without EBC coatings directly exposed to high-temperature burner-rig with No. 3 jet fuel as fuel were investigated. The corrosion behavior and logical sequence of each component within C/SiC under burner-rig test are analyzed. The corrosion mechanism of SiC, which is generally considered to be excellent in oxidation resistance, has been discussed.