Properties of supersonic sprayed composite WC-based cermet coatings

doi:10.13251/j.issn.0254-6051.2023.12.029

Abstract

Abstract: WC-12Co (WC)/NiCr dual coatings and conventional plasma sprayed Al₂O₃-13TiO₂ (AT13) coatings were prepared on 316L stainless steel substrate for piston rods by using plasma spraying technology and supersonic flame spraying technology. The properties of coatings were studied and compared by scanning electron microscope, X-ray diffraction, micro Vickers hardness tester, friction and wear testing machine, electrochemical workstation and other equipment. The results show that the interface of each coating has clear boundaries and good bonding. The microhardness of WC coating of 1363 HV0.3 is 1.8 times that of the AT13 coating. Under 60 min reciprocating friction and wear test conditions, the volume wear rate of the AT13 coating is 4.42 times that of the WC coating, and the wear mechanism of the WC coating is mainly abrasive wear. In the 3.5%NaCl solution, the corrosion potentials of both WC coating and AT13 coating are lower than that of the 316L stainless steel substrate, which avoids the preferential corrosion of the substrate by the galvanic coupling effect, and the corrosion current density of the AT13 coating is the largest, followed by 316L stainless steel substrate, while the corrosion current density of WC coating is the smallest, only 0.57 times that of the substrate.

Key words: supersonic flame spraying, plasma spraying, WC-based cermet coating, Al₂O₃-13TiO₂ coating, properties

CLC Number:

TG178

Tu Fuquan, Su Zihao, Wan Jiao. Properties of supersonic sprayed composite WC-based cermet coatings[J]. Heat Treatment of Metals, 2023, 48(12): 175-179.

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