粉末润滑界面边界层状态微观形态观察和分析

发布时间：2018-04-13 15:30

本文选题：粉末 + 润滑界面　；参考：《表面技术》2017年06期

【摘要】：目的粉末润滑边界层状态预示着润滑条件的优劣。粉末颗粒以其良好的润滑性能和承载能力以及对极端工况的适应性,被广泛应用于诸多领域,因此需对粉末润滑界面的摩擦润滑性能展开深入研究。方法利用UMT-2多功能摩擦磨损测试仪,结合形状测量激光显微系统对粉末润滑界面边界层的微观形态进行观察和机理分析。重点研究载荷(1、2、4、6 MPa)、速度(2、4、8、16 r/min)、粉末层厚度(1.5、3.5、5.5、7.5μm)以及表面粗糙度(0.389、0.745、1.751、3.112μm)等工况条件对粉末润滑的影响机制。结果较大的接触载荷有利于形成致密的边界层,提高润滑性能。在速度较低时,不利于形成完整、致密的边界层,润滑较差,甚至产生爬行现象,随着速度的增加,润滑效果改善,但过大的速度又会加快粉末耗散。适量的粉末层厚度能够使摩擦界面间形成完整、厚实的边界层,提供良好的润滑能力。粗糙度适当的表面有利于粉末润滑剂存储、边界层的形成以及润滑作用的维持。结论合理选择接触载荷、速度、粉末层厚度以及试样表面粗糙度有助于提高粉末颗粒的润滑性能。
[Abstract]:The lubrication state of boundary layer to powder indicates that the lubrication condition is good or bad. The powder particles with good lubricating performance and bearing ability and adaptability to extreme conditions, is widely used in many fields, so the friction on the lubrication performance of the powder lubrication interface in-depth research. By using the method of UMT-2 wear tester, combined with the micro morphology of shape measurement of laser micro system on powder lubrication boundary layer are analyzed. Key observation and Mechanism Study on load (1,2,4,6 MPa), speed (2,4,8,16 r/min), the powder layer thickness (1.5,3.5,5.5,7.5 m) and surface roughness (0.389,0.745,1.751,3.112 m) the influence mechanism of such conditions on powder lubrication. The contact load a large boundary layer to form a dense, improve the lubrication performance. At low speeds, not conducive to the formation of a complete boundary layer, dense, poor lubrication, Even the creeping phenomenon, with the increase of speed, improve the lubrication effect, but excessive speed will accelerate the dissipation. The thickness of the powder layer powder amount can make the friction interface formed between the complete boundary layer thick, provide good lubricating capacity. Surface roughness is appropriate for powder lubricant storage, maintain the formation of boundary layer and the lubrication effect. Conclusion the reasonable selection of contact load, velocity, powder thickness and surface roughness is helpful to improve the lubrication performance of the powder particles.

【作者单位】：合肥工业大学机械工程学院;
【基金】：国家自然科学基金资助项目(51475135,11472096)~~
【分类号】：TH117

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