应用激光, 2017, 37 (6): 763, 网络出版: 2018-01-10   

基于激光熔覆制备的梯度耐磨涂层性能研究

Research on Properties of Gradient Wear-resisting Coating Based on Laser Cladding
作者单位
1 皖西学院, 安徽 六安 237012
2 长春理工大学机电工程学院, 吉林 长春 130022
摘要
采用激光熔覆技术制备了不同工艺和不同合金粉末的梯度耐磨涂层, 研究了梯度耐磨涂层的显微硬度及耐磨性。结果表明: 当激光功率为800 W时, Co47+5%ω(WC)梯度耐磨涂层的显微硬度最高, 达713 HV0.1以上, 其摩擦系数最小且具有最佳的耐磨性能, 耐磨性较基体提高了300%。相比较而言, Co47+5%ω(WC)梯度耐磨涂层具有较高的显微硬度, 其耐磨性与Ni60+5%ω(WC)梯度耐磨涂层相当, 但Ni60+5%ω(WC)梯度耐磨涂层的摩擦系数较大, 随着摩擦时间的延长, 其磨损量加剧并缩短其使用寿命; Co47+5%ω(B4C)梯度耐磨涂层的显微硬度变化较大, 同一涂层不同区域的显微硬度值在536~772 HV0.1之间浮动, 其摩擦系数最大, 耐磨性能也随之降低。
Abstract
Gradient wear-resisting coating of different processes and different alloy powder were fabricated by laser cladding. The microhardness and wear-resistant properties of gradient wear-resisting coating were studied. Results indicate that the microhardness of Co47+5%ω(WC)gradient wear-resisting coating is the highest when the laser power is 800 W, which is over 713 HV0.1. The friction coefficient is the lowest and the wear-resistant properties is the best. The wear resistance is 3 times of that of the matrix. In contrast, the microhardness of Co47+5%ω(WC) gradient wear-resisting is higher, and the tribological properties is similar to that of Ni60+5%ω(WC)gradient wear-resisting. However, the friction coefficient of Ni60+5%ω(WC) gradient wear-resisting is larger. With increasing friction time, the wear extent is increased and its service life is shortened. The microhardness of Co47+5%ω(B4C)gradient wear-resisting coating varies greatly. The microhardness of different areas of the same coating change between 536~772 HV0.1, and its friction coefficient is the largest, the wear resistance also decreases.

张昌春, 石岩, 王洪新. 基于激光熔覆制备的梯度耐磨涂层性能研究[J]. 应用激光, 2017, 37(6): 763. Zhang Changchun, Shi Yan, Wang Hongxin. Research on Properties of Gradient Wear-resisting Coating Based on Laser Cladding[J]. APPLIED LASER, 2017, 37(6): 763.

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