Microstructure and properties of in-situ ZrB2-ZrC composite coatings by plasma spraying

The ZrB2-ZrC composite coating fabricated by ZrB2-ZrC powder shows low density and poor properties. To improve the quality of ZrB2-ZrC composite coating, Zr-B4C powder was used as precursor and the ZrB2-ZrC composite coating was successfully synthesized in situ on the surface of titanium alloy. The microstructure evolution and reaction mechanism of the Zr-B4C composite powder in plasma spraying process were investigated. The microstructure and properties of the ZrB2-ZrC composite coatings fabricated by ZrB2-ZrC and Zr-B4C composite powders were investigated comparatively. The results indicate that a dense and fine grain microstructure was formed in the in situ synthesized ZrB2-ZrC composite coating, and the quality and properties of the coating were improved, which is attributed to the reaction between Zr and B4C and then the improved melting degree of the powder during the plasma spraying process.

Automated summary

Investigated the method of using Zr-B4C powder to synthesize ZrB2-ZrC composite coating, resulting in a dense and fine grain microstructure, improving the quality and properties of the coating.