Study on Thermal Spraying Process of Dual Hard Phase Material Cr3C2-WC-NiCoCrMo
A dual hard phase material,Cr3C2-WC-NiCoCrMo thermal spraying powder,was prepared by ag-glomeration-sintering method,with the coating prepared by utilizing high-velocity oxygen-fuel(HVOF)spraying technology.And the effects of powder microstructure and oxygen-fuel ratio(λ)of thermal spra-ying on the microstructure and properties of the coating were studied.The results show that with an in-crease in sintering temperature,the apparent density and fluidity of the powder increase,leading to a denser microstructure.Under the condition of a fixed oxygen-fuel ratio of 1.09 during thermal spraying,the com-prehensive performance of the prepared coating is relatively excellent when the sintering temperature of the spraying powder is 1 295 ℃,with its microhardness of(1 135.8±40.7)HV0.3 and porosity of 1.1％± 0.1％.And under the condition of a fixed sintering temperature of the spraying powder of 1 295 ℃,the prepared coating with the oxygen-fuel ratio of 1.0 during thermal spraying has the optimal comprehensive performance,with a microhardness of(1 145.8±39.6)HV0.3,a deposition efficiency of 48.8％,and a po-rosity of 1.0％±0.1％.
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