冷喷涂Cu402F涂层激光重熔表面改性后摩擦学行为

发布时间：2018-04-26 08:37

本文选题：激光重熔 + 冷喷涂　；参考：《表面技术》2017年10期

【摘要】：目的研究激光重熔后冷喷涂Cu402F涂层在腐蚀介质中的摩擦学行为。方法采用冷喷涂技术在镍铝青铜9442合金上制备了厚度约为882.11μm的Cu402F涂层,并使用激光重熔技术对冷喷涂涂层进行表面改性。使用OM、SEM观察涂层截面与表面的微观形貌;使用XRD、X射线残余应力测试仪、多功能表面性能测试仪、多频直线往复磨蚀实验机,重点表征测试了涂层的组织、表面残余应力、摩擦学性能与磨蚀行为。结果激光重熔后的涂层分为表面重熔层、多孔的重熔过渡层以及冷喷涂遗传层。激光重熔前后,涂层的物相、残余应力均未发生较大变化。在20、50、100 N条件下,激光重熔态涂层的平均摩擦系数呈递增趋势,磨损率分别为1.01×10~(-2)、1.17×10~(-2)、1.34×10~(-2) mm~3/(N·m);由磨蚀实验可知,磨蚀是涂层表面产生钝化膜与钝化膜被破坏的此消彼长的过程,反映着摩擦与腐蚀的协同作用,涂层在磨蚀过程中,开路电位与摩擦系数呈正相关,说明激光重熔态涂层表面钝化膜产生的速度快于钝化膜被坏的速度。结论激光重熔保留了冷喷涂技术制备的Cu402F涂层的优点,同时激光重熔涂层上产生钝化膜的速度更快,有利于提高涂层的耐磨蚀性能。
[Abstract]:Aim to study the tribological behavior of cold sprayed Cu402F coating after laser remelting in corrosive medium. Methods Cu402F coating with thickness of 882.11 渭 m was prepared on Ni-Al bronze 9442 alloy by cold spraying technology. The surface of the coating was modified by laser remelting technique. The microstructure and surface residual stress of the coating were observed by using OMU SEM, XRDX X-ray residual stress tester, multifunction surface performance tester and multi frequency linear reciprocating abrasion tester. The microstructure and surface residual stress of the coating were characterized and tested. Tribological properties and wear behavior. Results the coating after laser remelting was divided into surface remelting layer, porous remelting transition layer and cold spraying genetic layer. Before and after laser remelting, the phase and residual stress of the coating did not change significantly. The average friction coefficient of the laser remelted coating shows an increasing trend under the condition of 20 ~ 50100N, the wear rate is 1.01 脳 10 ~ (-1) ~ (-2) ~ (-1) 脳 10 ~ (10) ~ (-2) mm~3/(N ~ (2), the wear experiment shows that the wear is the process of the passivation film and the passivation film being destroyed on the surface of the coating. Reflecting the synergistic effect of friction and corrosion, the open-circuit potential is positively correlated with the friction coefficient during the abrasion process of the coating, which indicates that the passivation film on the surface of the laser remelting coating is produced faster than that of the passivation film. Conclusion Laser remelting retains the advantages of Cu402F coating prepared by cold spraying, and the passivation film is produced faster on the laser remelted coating, which is beneficial to improve the wear resistance of the coating.
【作者单位】：装甲兵工程学院;
【基金】：军内科研基金~~
【分类号】：TG174.442

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