炮钢表面电火花沉积钨合金涂层的摩擦磨损性能

Friction and Wear Performance of Electrospark Depositing Tungsten Alloy Coating on Gun Steel

针对火炮身管服役过程中内膛磨损严重的问题,采用电火花沉积技术在炮钢基体表面制备耐磨损的钨合金涂层,提高火炮身管内膛的摩擦磨损性能。使用纳米压痕仪和往复式摩擦实验机分别测试涂层与基体的纳米力学性能和摩擦磨损性能;采用SEM/EDS、XRD表征涂层和基体的微观形貌、成分与相结构。结果表明,钨合金涂层由γ-Fe(W)和α-Fe相组成;钨合金涂层的硬度和弹性模量较基体分别提高47.4%和2.6%;在2N载荷和48mm/s滑动速度下,钨合金涂层的摩擦系数为0.22~0.25,基体的摩擦系数为0.38~0.46,钨合金涂层的磨损率较基体降低53.7%;钨合金涂层的磨损机制主要为微切削磨损和氧化磨损,基体的磨损机制主要为粘着磨损。

Aiming at the severe wear problem in the serve of gun bore,the wear-resistant tungsten coating was prepared on the surface of gun steel substrate by means of electrospark deposition technology to increase the performance of friction and wear of gun bore.The nanoindenter and reciprocating friction tester was employed to test the nano-mechanical and friction and wear performance of coating and substrate,respectively.The microstructure,composition and phase structure of coating and substrate were characterized by utilizing the SEM/EDS,XRD.The results showed that the tungsten alloy coating is composed ofγ-Fe(W)andα-Fe;the hardness and elasticitymodulus of the tungsten alloy coating increased by 47.4%,2.6%over those of the substrate,respectively;the friction coefficient of the tungsten alloy coating is 0.22~0.25 and that of the substrate 0.38~0.46 at 2N load and 48mm/s sliding speed,and the wear rate of the tungsten alloy coating reduced by 53.7%over that of the substrate;the main wear mechanism of the tungsten alloy coating is micro-cutting and oxidation wear while that of the substrate is adhesive wear.