Microstructure and properties of plasma physical vapor deposition coatings
AlCoCrFeNi high-entropy alloy coating was prepared on 316L stainless steel by plasma physical vapor deposition.The effects of spraying distance and current on the phase composition,surface morphology,cross section morphology,hardness,bonding strength and wear resistance of high-entropy alloy coating were studied.The results show that the high-entropy alloy coating is mainly composed of BCC,B2 and FCC phases at different spraying distances and currents;As the current or spraying distance increases,the average grain size of BCC in the coating first increases and then decreases.When the spraying distance is 460 mm,as the current increases from 1600 A to 2000 A,the average friction coefficient of the coating gradually increases,the surface and section hardness first decreases and then increases,the coating adhesion and strength first increase and then decrease,and the wear of the coating first increases and then decreases;When the current is 1800 A,as the spraying distance increases from 420 mm to 500 mm,the average friction coefficient of the coating gradually decreases,the surface hardness first decreases and then increases,the cross-sectional hardness first increases and then decreases,the bonding force and strength of the coating gradually increase,and the wear rate of the coating gradually decreases.The wear rate of high-entropy alloy coating is related to the surface hardness and cohesive strength of the coating.
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