Tantalum carbide/graphite composite material and preparation method thereof: Fid-Bau Portal

Tantalum carbide/graphite composite material and preparation method thereof

XUE YUNZHOU / LIU HENGCHANG / HE SHAOLONG

The invention discloses a tantalum carbide/graphite composite material and a preparation method thereof, and relates to the field of graphite/coating composite materials. The tantalum carbide/graphite composite material comprises a graphite matrix, a transition layer and a tantalum carbide coating, wherein the transition layer is connected with the graphite matrix and the tantalum carbide coating; the transition layer comprises graphite and tantalum carbide, pores of the graphite are filled with the tantalum carbide, and in the transition layer, the porosity of the graphite is gradually reduced in the direction from the tantalum carbide coating to the graphite matrix, the content of the tantalum carbide is gradually reduced, and the porosity of the tantalum carbide is gradually reduced in the direction from the tantalum carbide coating to the graphite matrix. At least part of tantalum carbide in the transition layer extends from pores of graphite to the tantalum carbide coating and is connected with the tantalum carbide coating. Therefore, a strong binding force is formed between the coating and the matrix, and the service life of the composite material can be prolonged; the transition layer can slow down mutation of the thermal expansion coefficient between the graphite matrix and the tantalum carbide coating, and stress release caused by thermal shock is promoted.

本发明公开了碳化钽/石墨复合材料及其制备方法，涉及石墨/涂层复合材料领域。所述碳化钽/石墨复合材料包括石墨基体、过渡层和碳化钽涂层，所述过渡层连接所述石墨基体和所述碳化钽涂层；所述过渡层包括石墨和碳化钽，碳化钽填充在石墨的孔隙中，沿所述碳化钽涂层指向所述石墨基体的方向上，所述过渡层中，石墨的孔隙率逐渐减小，碳化钽的含量逐渐减小，过渡层中的至少部分碳化钽由石墨的孔隙向所述碳化钽涂层延伸并与所述碳化钽涂层相连。由此，涂层与基体之间具有较强的结合力，有利于延长复合材料的使用寿命；过渡层可以减缓石墨基体至碳化钽涂层之间的热膨胀系数的突变，促进热冲击带来的应力释放。

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