| abstract |
The invention relates to an oxide high-entropy ceramic with a defective fluorite structure and a preparation method for an anti-ablation coating thereof. First, a high-entropy ceramic powder is prepared by a high-temperature solid-phase reaction method, and then a supersonic plasma spraying technology is used to prepare the high-entropy ceramic powder. The high-entropy ceramic coating of the corresponding composition was prepared on the surface of the matrix material after spray-drying the high-entropy ceramic powder. The (HfZr(3RE))O 2-δ (RE=Sm, Er, Ce, Y, Yb) high-entropy ceramic coating of the present invention has excellent phase stability and anti-ablation performance. In the process of supersonic plasma spraying, the high-entropy ceramics have no phase transition and phase decomposition, and the prepared high-entropy ceramic coatings still maintain the phase structure of the original high-entropy ceramic powders. The high-entropy ceramic coating was ablated in an oxyacetylene flame with a heat flux density of 2.38MW/m 2 . During the ablation process, the maximum temperature of the coating surface reached 1900-2100℃, and the coating did not peel off or peel off after ablation. occurs, has a lower ablation rate, and exhibits excellent ablation resistance. |