Morphology and microstructure of SiC/SiC composites ablated by oxyacetylene torch at 1800°C. Issue 14 (November 2021)

• Record Type: Journal Article
• Authors: Yu, Guoqiang; Du, Jinkang; Zhao, Xuecan; Xie, Chuyang; Gao, Xiguang; Song, Yingdong; Wang, Fang
• Is Part Of: Journal of the European Ceramic Society. Volume 41:Issue 14(2021)
• Page Start: 6894
• Page End: 6904
• Publication Date: 2021-11
• Subjects: SiC/SiC ceramic -- Thermal ablation -- Micro structures -- Macro morphology; 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.2021.06.026
• Languages: English
• ISSNs: 0955-2219

Abstract

Highlights: The ablation mechanism of SiC/SiC composites under 1800°C gas environment was revealed. SiC fibers were the conical tip under the action of thermochemistry and thermomechanics. SiO2 nanowires formed on SiC substrate in edge region by high-temperature gas. Ablation gas products destroy the continuity of SiO2 and reduce the ablation resistance of the material. Abstract: An oxyacetylene torch tested the ablation of SiC/SiC composites at 1800℃. According to the distribution of ablation product silica, the morphology could be divided into three regions. The fibers in the oval central region were ablated and broken, and the fracture surface is the conical tip. The silica liquid film in the transition region plays a role in resisting the ablation of the material. However, the generation of airflow channels destroys the liquid film's continuity and reduces the material's ablation resistance. Bean sprouts-like nano-sized silica was grown on the surface of the dome-top SiC matrix in the marginal region.