Preparation and properties of supersonic atmospheric plasma sprayed TiB2-SiC coating

With the TiB2-SiC powders after spray granulation and vacuum calcination as raw materials, the TiB2-SiC coating was prepared by supersonic atmospheric plasma spraying (SAPS). The effects of spraying power and spraying distance on the properties of the TiB2-SiC coating were investigated and the fabrication processing of SAPS was optimized. The results show that the sprayed powders after calcination have a uniform particle size distribution, good sphericity and enhanced fluidity. The coating prepared by the calcined powders has a dense structure and high deposition efficiency. When the calcined TiB2-SiC powders are used and the spraying power is 95 kW and the spraying distance is 150 mm during supersonic plasma spraying, the obtained TiB2-SiC coating behaves the best comprehensive performance with the porosity, microhardness, bonding strength and resistivity equal to 5.6%, 3.57 GPa, 18.3 MPa and 10.8 m Omega.cm, respectively.

Automated summary

In this study, TiB2-SiC coating was prepared using supersonic atmospheric plasma spraying (SAPS) with TiB2-SiC powders after spray granulation and vacuum calcination. The effects of spraying power and distance on the coating properties were investigated, and the optimal fabrication processing of SAPS was determined. The coating prepared by calcined powders exhibited uniform particle size distribution, good sphericity, and dense structure with high deposition efficiency.