Microstructure and ablation performance of HfC/PyC core-shell structure nanowire-reinforced Hf1-xZrxC coating. Issue 15 (December 2021)

• Record Type: Journal Article
• Authors: Ren, Jincui; Lv, Chaofeng; Duan, Yuting; Zhang, Yulei; Zhang, Jian
• Is Part Of: Journal of the European Ceramic Society. Volume 41:Issue 15(2021)
• Page Start: 7450
• Page End: 7463
• Publication Date: 2021-12
• Subjects: C/C composites -- Carbide coating -- Core-shell structure nanowire -- Microstructure -- Ablation performance; 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.2021.08.036
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: To improve the ablation performance of C/C composites, HfC/PyC core-shell structure nanowire (HfCnw/PyC)-reinforced Hf1-x Zrx C coating was prepared via three-step chemical vapor deposition (CVD) method. Effects of HfCnw/PyC and PyC layer thickness on the microstructure, residual stress and ablation performance of Hf1-x Zrx C coating were studied. HfCnw/PyC-reinforced coatings exhibited equiaxial crystal structure. After incorporating HfCnw/PyC, ablation property of Hf1-x Zrx C coating was enhanced because of the skeleton role of HfO2 nanowires. PyC possessed low coefficient of thermal expansion (CTE) and high heat conductivity, but poor ablation performance. Hence, with the increase in thickness of PyC layer, ablation property of the coating first increased and then decreased. HfCnw/PyC-reinforced Hf1-x Zrx C coating with PyC layer thickness of about 50 nm exhibited the best ablation property.