Ablation performance of C/C-ZrC-SiC composites with in-situ YSi2-doped ZrC-SiC-ZrSi2 coating under oxyacetylene torch

• Published in: Corrosion science 2022-12, Vol.209, p.110802, Article 110802
• Main Authors: Ma, Jingchao, Kou, Sijie, Yang, Shaobo, Liu, Yinghao, Luan, Chenghua, Wang, Peng, Fan, Shangwu
• Format: Article
• Language: English
• Subjects: Ablation resistance; Ceramic matrix composites; In-situ coating; Rare earth oxides; ZrC-SiC-ZrSi2 coating
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2022.110802

C/C-ZrC-SiC composites with in-situ formed ZrC-SiC-ZrSi2 coating (ZS) and YSi2-doped ZrC-SiC-ZrSi2 coating (YZS) were prepared by reactive melting infiltration (RMI). The ablation behavior was investigated under the oxyacetylene torch with heat fluxes of 2.38 and 4.18 MW/m2. Results showed that YZS exhibited a more integrated scale and lower ablation rates after ablation due to the doping of YSi2. The Y2O3 and ZrO2 phases could form substitutional solid solutions during ablation, which had a dense structure and could lower the surface temperature of composites. Meanwhile, Y2O3 could inhibit the phase transition of ZrO2, promoting the sintering of ZrO2 during ablation. •The C/C-ZrC-SiC composites with ZrC-SiC-ZrSi2 coating (ZS) and YSi2-doped ZrC-SiC-ZrSi2 coating (YZS) were prepared.•YZS showed more excellent ablation resistance than the ZS after ablation under the oxyacetylene torch.•The ablation mechanism of ZS and YZS during ablation were systematically studied.