Abstract
SiC-ZrC-Al2O3 ceramic coating was prepared on the SiC coated carbon/carbon (C/C) composites by in-situ reaction method to improve its ablation resistance at high temperatures. The phase compositions, microstructures, and ablation properties (carried out by an oxyacetylene torch) of the coating were investigated. During ablation process, the outer coating experienced solid state (ZrO2 and Al2O3) precipitate from the molten eutectic (Zr-O-Al-Si layer) and formed dense Zr-O-Al-Si layer on the surface of the coating. These dense layers can prevent oxygen diffuse into the specimen. After ablation, the coating forms layered structure: SiO2 glass layer distribute with some hemi-spherical particles (Zr-O-Al, dense dendrites structure), Zr-O-Al-Si, Zr-O-Al, Zr-O-Si, less affect SiC-ZrC-Al2O3 and SiC layer. The newly formed Al2(SiO4)O and ZrSiO4 are stable phases with a dense structure, which can effectively consume the internal stress and prevent the spread of cracks. With the increase of ablation time, the SiO2 evaporate, leading to the increase of hemi-spherical particles.
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