Journal
CORROSION SCIENCE
Volume 209, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110802
Keywords
Ceramic matrix composites; Ablation resistance; In -situ coating; ZrC-SiC-ZrSi2 coating; Rare earth oxides
Funding
- Natural Science Foundation of China [52272090, 52172100]
- Nature Science Basic Research Program of Shaanxi [2022JZ-22]
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C/C-ZrC-SiC composites with different coatings were prepared and their ablative behavior was studied. The results showed that the coating with YSi2 doping improved the ablative resistance of the composites.
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 inte-grated 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.
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