硬质合金表面织构液相辅助激光制备及摩擦性能

采用激光加工技术在空气介质与辅助液相(无水乙醇与双氧水体积比为50:1)下对YT15硬质合金表面进行了交叉扫描织构加工，制备出了两组织构试样. 借助Quanta 200扫描电子显微镜及能谱对织构硬质合金表面形貌与元素含量进行了测量，并用SDC-100接触角测量仪表征了润湿性，最后在MWF-500往复式摩擦磨损试验机上进行了干摩擦、润滑油及润滑油与MoS2颗粒润滑的摩擦和磨损对比试验. 研究结果表明：相比空气介质激光加工试样，液相辅助激光加工表面的微凹坑分布更加均匀，无明显的氧化及熔融物重铸现象，表面接触角最小(55°)；三种工况下液相辅助激光加工表面织构的摩擦系数最小，磨损量有一定改善. 分析表明：辅助液体对激光加工表面起到了冷却及保护作用，固-液界面快速产生的气泡散射了激光光束，使激光光束的作用区域发生干涉，同时携带出加工熔融物. 因此，润滑介质更容易在界面间渗入及铺展，改善了界面摩擦学特性.

Cross-scan texture processing was performed on the surface of YT15 cemented carbide using laser processing technology under air medium and auxiliary liquid phase (volume ratio of absolute ethanol to hydrogen peroxide 50:1), and two sets of textured specimens were prepared. The surface morphology and elemental content of the textured cemented carbide were measured using a Quanta 200 scanning electron microscope and energy dispersive spectroscopy, and the wettability was characterized with an SDC-100 contact angle measuring instrument. Finally, comparative friction and wear tests were conducted on an MWF-500 reciprocating friction and wear tester under three conditions: dry friction, lubricating oil lubrication, and lubricating oil mixed with MoS₂ particle lubrication. The research results show that compared with the specimens processed by laser in air medium, the micro-pits on the surface of the liquid-phase assisted laser processed specimens are more uniformly distributed, without obvious oxidation and molten material recasting phenomena, and the surface contact angle is the smallest (55°). The surface texture prepared by liquid-phase assisted laser processing has the smallest friction coefficient under the three working conditions, and the wear amount is improved to a certain extent. The analysis shows that the auxiliary liquid plays a role in cooling and protecting the laser-processed surface. The bubbles rapidly generated at the solid-liquid interface scatter the laser beam, causing interference in the acting area of the laser beam, and also carry away the processed molten material. Therefore, the lubricating medium more easily infiltrates and spreads between the interfaces, improving the interfacial tribological properties.

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背景与挑战

背景概述

该数据集聚焦于硬质合金表面织构的制备与摩擦性能研究，通过对比空气介质和液相辅助激光加工方法，展示了液相辅助技术在改善表面形貌、减少氧化和降低摩擦系数方面的显著效果。实验结果表明，辅助液体的冷却和保护作用促进了润滑介质的渗入，从而优化了界面摩擦学特性，为材料表面处理提供了实用数据。