超音速大气等离子喷涂TiB2-SiC涂层的抗氧化性及耐熔盐腐蚀性能

Resistance Behavior to Oxidation and Molten Salt Corro-sion of Supersonic Atmospheric Plasma Sprayed TiB2-SiC Coating

摘要:

采用超音速大气等离子喷涂制备全包覆TiB₂-SiC涂层，研究了TiB₂-SiC涂层在400和800 ℃的氧化性能，并探究其氧化机理。对TiB₂-SiC涂层在900 ℃下的抗铝熔盐腐蚀性能进行研究，并探讨其耐熔盐腐蚀机理。结果表明，超音速大气等离子喷涂制备的TiB₂-SiC涂层具有良好的抗氧化性，在400 ℃的氧化速率常数为1.92×10^-5 mg²·cm^-4·s^-1，在800 ℃的氧化速率常数为1.82×10^-4 mg²·cm^-4·s^-1。超音速大气等离子喷涂制备的TiB₂-SiC涂层在900 ℃下具有良好的抗熔盐腐蚀性能，熔盐腐蚀后TiB₂-SiC涂层都保持致密结构，未发生涂层的开裂及剥落。

Abstract:

The fully-coated TiB₂-SiC coating was prepared by supersonic atmospheric plasma spraying (SAPS). The oxidation performance of TiB₂-SiC coating at 400 and 800 °C was studied and the oxidation mechanism was investigated. The corrosion resistance of TiB₂-SiC coating to aluminum melting salt at 900 °C was studied, and the anti-corrosion mechanism of molten salt was discussed. The results show that the TiB₂-SiC coating prepared by SAPS has good anti-oxidation performance. The oxidation rate constant at 400 °C is 1.92×10^-5 mg²·cm^-4·s^-1, and that at 800 °C is 1.82×10^-4 mg²·cm^-4·s^-1. The TiB₂-SiC coating prepared by SAPS has good resistance to molten salt corrosion at 900 °C. TiB₂-SiC coating maintains a dense structure after molten salt corrosion, and cracking and peeling of the coating do not occur.