Abstract An amorphous silica coating was prepared on graphite substrate by laser cladding to improve the ablation resistance using a silicon interlayer as a transition layer. The laser cladding processes were carried out in the air atmosphere, which can simplify production conditions. The amorphous silica coating is uniform and dense, combining well with the graphite substrate. There is no obvious boundary between the silicon transition layer and the silica coating. Ablation test demonstrates that the silica coating has excellent performance compared to the uncoated graphite, and the silica-coated graphite has a weight loss of 2.17% after 80 min. After the ablation test, the silica coating still has a uniform and dense microtopography.

中文翻译：

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激光熔覆在石墨基体上制备非晶二氧化硅涂层

摘要 以硅夹层为过渡层，通过激光熔覆在石墨基体上制备非晶二氧化硅涂层以提高抗烧蚀性能。激光熔覆工艺在空气气氛中进行，可以简化生产条件。无定形二氧化硅涂层均匀致密，与石墨基体结合良好。硅过渡层和二氧化硅涂层之间没有明显的边界。烧蚀试验表明，二氧化硅涂层与未涂层石墨相比具有优异的性能，二氧化硅涂层石墨在 80 分钟后重量损失为 2.17%。经烧蚀试验后，二氧化硅涂层仍具有均匀致密的微观形貌。