超音速火焰喷涂喷枪行进速度对WC-CoCr涂层的制备及其耐磨性能的影响

Effect of the spray gun velocity on preparation and wear resistance property of WC-CoCr coatings deposited by high velocity oxy-fuel

采用超音速火焰喷涂在不同喷枪行进速度下制备了WC-CoCr涂层,观察其组织与结构,并检测其硬度、密度、耐磨性等力学性能。结果表明:涂层硬度及耐磨性随着喷枪行进速度的提高起初先上升,这是由于单位时间内对涂层的热输入降低,降低了涂层内粒子的膨胀程度,从而提高了涂层的致密度、硬度及耐磨性。随着喷枪行进速度的继续上升涂层致密度降低,这是由于喷枪行进速度过快之后粒子撞击基体的角度发生了改变,一部分粒子发生反弹而降低了涂层致密度。当载物台转速为75 r/min时涂层耐磨性能最好。

WC-CoCr coating was prepared by high velocity oxy-fuel with different move velocity of spray gun. The structure was observed and the hardness, density and wear resistance property were tested. It had been shown that with the increasing move velocity of spray gun, the hardness and wear resistance property were increasing in the beginning because of the thermal input reduce in unit time which decrease the expansion degree of particle. Consequently, the density, hardness and the property of wear resistance were increasing. With the continuously increasing move velocity of spray gun, the density and other properties of coating decreased because of the increased angle of particle when it impacted the substrate and a part of the particles would rebound which would cause a decrease of coating density. The coating with the revolution of 75 r/min of objective table showed the best wear resistance property.