Microstructure and properties of SiC-316 composite coatings prepared by laser-assisted cold spraying

doi:10.13251/j.issn.0254-6051.2025.04.046

Abstract

Abstract: 316L coating and SiC-316L composite coating on Q235 steel substrate were prepared using the laser-assisted cold spraying (LACS) technology, respectively, and the laser power for preparation of SiC-316L composite coating was determined according to the quality of 316L coatings under different laser powers, and then the microstructure, phase composition, hardness and wear resistance of the two coatings were studied and compared. The results show that the increase of laser power can significantly reduce the porosity of 316L coating and improve the bonding strength between the coating and the substrate. When the laser power is 500 W, the pores and microcracks of 316L coating are the least, the SiC particles are uniformly distributed in the SiC-316L composite coating, and no obvious oxidation and phase transformation occur in the two coatings which bonding mechanism between the coating and the substrate is the coexistence mechanism of mechanical bonding and metallurgical bonding. The average hardness of the 316L coating and SiC-316L composite coating reaches 437.7 HV0.3 and 490.3 HV0.3, respectively. The friction coefficient of the SiC-316L composite coating is 35% lower than that of the 316L coating under room temperature wear condition, and the friction coefficient of the SiC-316L composite coating is 18.4% lower than that of the 316L coating under 600 ℃ high temperature wear condition, showing that the SiC-316L composite coating exhibits more excellent wear resistance.

Key words: laser-assisted cold spraying, composite coating, laser power, phase composition, hardness, wear resistance

CLC Number:

TG178

Yu Baoyi, Ma Hongdi, Zheng Li. Microstructure and properties of SiC-316 composite coatings prepared by laser-assisted cold spraying[J]. Heat Treatment of Metals, 2025, 50(4): 295-301.

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