PERFORMANCE OF HIGHSPEED FRICTION AND WEAR OFELECTROSPARK DEPOSITED AlCoCrFeNi HIGH ENTROPYALLOY COATING

[摘要] An AlCoCrFeNi high-entropy alloy coating was prepared on a CrNi3MoVA steel substrate by means of electrospark deposition (ESD) technology and its high-speed friction and wear performance investigated. The nano-mechanical properties and friction coefficient were tested by employing the nanoindentor and the friction and wear testing machine respectively, and the phase structure was obtained by using X Ray Diffraction (XRD), and the morphologies, composition were analyzed before and after friction by utilizing scanning electron microscopy (SEM) and energy dispersive X-ray spectrum (EDS) .The results showed that the AlCoCrFeNi coating, with compact structure free of cracks, is composed of BCC and FCC double phases; the hardness of the AlCoCrFeNi coating increases about 1.0 time, the elasticity modulus reduces about 2.3%, the H/E value increases about 1.1 times, and the H3/E2 value increases about 7.8 times than that of the CrNi3MoVA steel; when the quenched GCr15 steel ball was used as the material of the grinding head under the friction condition that the load was 10 N, the reciprocating travel 10 millimeter and the velocity 1000 rounds per minute, the steady friction coefficient of the CrNi3MoVA steel is 0.85-0.95 while that of the AlCoCrFeNi coating only 0.29-0.38, and the wear rate of the CrNi3MoVA steel is about 9.4 times that of the AlCoCrFeNi coating. The AlCoCrFeNi coating has an obvious anti-friction and wear resistance effect, which mainly attributes to the high mechanical properties and the formed oxide scale with good adherence on the coating in the course of high-speed friction and wear.

[学科分类] 生物技术

[关键词] High entropy alloy AlCoCrFeNi coating E lectrospark deposition H igh speed;friction and wear