通过 SPS 在石墨上涂覆含有 WC 和 MoSi2 添加剂的 ZrB2-SiC-Si 复合材料的烧蚀行为

Mehran Jaberi Zamharir, Mohammad Zakeri, Zahra Jahangiri, Ahad Mohammadzadeh
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摘要

本文旨在研究在石墨基底上使用超高温陶瓷材料制成的屏蔽复合涂层的抗烧蚀性。在石墨上涂覆涂层时,采用了火花等离子烧结工艺。应用的单层涂层的基本成分为 ZrB2-SiC-Si,添加剂为 WC 和 MoSi2,两者的含量分别为 1.25 和 3.75 Vol%。氧乙炔焰烧蚀试验的结果表明,使用复合保护涂层可显著提高石墨基底的抗烧蚀能力。含有更多 WC 和 MoSi2 添加剂的涂层在 30-210 秒内的抗烧蚀性能更好。在烧蚀过程开始时形成的 (Zr,Si)O2 氧化层,以及在复合涂层表面形成的多孔微结构层,在较长的烧蚀时间内起到了防止内部零件被破坏和侵蚀的作用。
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Ablation behavior of ZrB2–SiC–Si composites with WC and MoSi2 additives coated through SPS on graphite
The intention of this paper is to investigate the resistance to ablation of shielding composite coatings built with ultra-high temperature ceramic materials on graphite substrate. To apply the coating on the graphite, the spark plasma sintering route was employed. The applied monolayer coatings had the base compositions of ZrB2–SiC–Si with the additives of WC and MoSi2, both in the same contents of 1.25 and 3.75 vol%. The outcomes achieved from the ablation tests by oxyacetylene flame showed that applying the protective composite coatings notably enhances the resistance to ablation of the substrate made of graphite. The coating containing more of WC and MoSi2 additives had better performance in terms of ablation resistance in 30-210 seconds. The formation of an oxide layer of (Zr,Si)O2 at the beginning of the ablation process and creating a layer with a porous microstructure on the composite coating surface functioned as a barrier against the destruction and erosion of the inner parts during longer ablation times.
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