Ablation performance of C/HfC-SiC composites with in-situ HfSi2/HfC/SiC multi-phase coatings under 3000 ℃ oxyacetylene torch. (15th May 2022)

• Record Type: Journal Article
• Authors: Kou, Sijie; Fan, Shangwu; Ma, Xu; Ma, Yujie; Luan, Chenghua; Ma, Jingchao; Liu, Chuanxin
• Is Part Of: Corrosion science. Volume 200(2022)
• Publication Date: 2022-05-15
• Subjects: Ceramic matrix composites -- In-situ coating -- Reactive melt infiltration -- Ablation performance; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110218
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: A HfSi2 /HfC/SiC multi-phase coating with reticular HfSi2 as a skeleton was in-situ formed on the surface of C/HfC-SiC composite after RMI process. After ablation for 120 s, the linear and mass ablation rate of the prepared composites was − 2.33 ± 0.14 µm/s and − 0.06 ± 0.03 mg/s·cm 2, respectively. In the central region, there were voids inside coating and a gap was between the coating and substrate, while in the transitional region a dense HfC1−x Ox -HfO2 -SiC mixed layer effectively protected substrate from ablation. In the brim region, only the coating near-surface was ablated. The results proved infinite potential of C/HfC-SiC composites with in-situ coating in ablation resistance. Highlights: A HfSi2 /HfC/SiC multi-phase coating was in-situ formed on the surface of the C/HfC-SiC composite prepared by RMI. C/HfC-SiC composite with an in-situ coating showed excellent ablation resistance under 3000℃ oxyacetylene torch for 120s. After ablation three typical ablation regions with different structures were observed on the surface. The ablation mechanism of typical ablation regions was systematically studied.