纳米磁性流体与表面织构对钛合金的协同减摩作用机制  

Synergistic Friction-reducing Mechanism of Nano-magnetic Fluid Lubrication on Grooved Surface Texture of Titanium Alloy

作　　者：王优强 赵涛 莫君 刘新福 何彦 WANG You-qiang;ZHAO Tao;MO Jun;LIU Xin-fu;HE Yan(School of Mechanical and Automotive Engineering,Qingdao University of Technology,Shandong Qingdao 266520,China;Key Lab of Industrial Fluid Energy Conservation and Pollution Control,Ministry of Education,Shandong Qingdao 266520,China)

机构地区：[1]青岛理工大学机械与汽车工程学院,山东青岛266520 [2]工业流体节能与污染控制教育部重点实验室,山东青岛266520

出　　处：《表面技术》2023年第10期141-150,共10页Surface Technology

基　　金：国家自然科学基金(51575289);泰山学者工程专项经费资助(tsqn202211177);山东省自然科学基金(ZR2021ME063)。

摘　　要：目的 提高钛合金表面的摩擦学性能。方法 采用纳秒激光器在钛合金表面构造沟槽型微织构图案,并以水基纳米磁流体和去离子水为润滑剂,利用UMT-3摩擦磨损试验机探究了织构与纳米磁流体的协同减摩作用机制。结果 分析了不同润滑条件下,沟槽型织构的分布间距对钛合金表面摩擦磨损性能的影响,在织构与纳米磁流体的协同作用下,钛合金表面的摩擦学性能得到改善,织构间距为250μm时的摩擦学性能最好,摩擦因数最大降低约51.5%,磨损率最大降低77.6%。当织构间距过小,织构化表面承载区减少,导致织构磨损较快,而织构间距过大会弱化织构效果。其次,以最优织构间距为基础,进一步探究了不同表面织构形貌和深度对钛合金表面摩擦学性能的影响。最后,研究了最优织构参数下,滑动速度和加载载荷对钛合金减摩性能的影响。结论 在润滑条件下,织构的表面形貌和深度影响钛合金表面的摩擦学性能,织构深度太浅或太深时,其流体动压效应都会减弱,从而导致摩擦因数和磨损量增大;当产生足够大的动压效应时,织构边缘的凸起结构能够对织构起到保护作用,延缓织构磨损。In order to improve the tribological properties of titanium alloy surfaces,a nano-second laser was used to construct a grooved micro-texture pattern on the surface of titanium alloy,and water-based nano-magnetic fluid and deionized water were used as lubricants.The mechanism of synergistic friction reduction between texture and nano-magnetic fluid was investigated with an UMT-3 friction and wear tester.For the friction experiment of grooved texture with different spacing,the experimental load was 3 N,the sliding speed was 36 mm/s,and the experimental time was 30 min.The load was kept constant at 3 N,and the variable velocity experiment was designed,with the speed increased from 6 mm/s to 48 mm/s in turn.The speed was kept at 36 mm/s,and the variable load experiment was designed.The load was successively increased from 0.5 N to 4 N.Firstly,the effect of the distribution spacing of the grooved texture on the friction and wear properties of the titanium alloy surface was analyzed under different lubrication conditions.The tribological properties of the titanium alloy surface were improved under the synergistic effect of the texture and nano-magnetic fluid.When the texture spacing was 250 μm,the tribological properties of the titanium alloy surface were the best,and the maximum friction coefficient was reduced by 51.5%.The wear rate was reduced by 77.6%.The grooves could store magnetic particles and abrasive debris,thus reducing the plowing effect of particles on the specimen.At the same time,lubricating oil could be stored inside the grooves.In friction,the internal lubricating oil was extruded to achieve "secondary lubrication",so as to reduce wear.In addition,the grooves of a certain size could also form a dynamic pressure effect when the friction pair slided,which increased the bearing capacity of the water film,and reduced the damage to the surface.When the texture spacing was too small,the bearing area of the textured surface was reduced,the shear force was enhanced,and the texture wear was faster,while the fr

关 键 词：钛合金 沟槽型织构 纳米磁性流体 协同减摩作用 摩擦磨损 流体润滑 

分 类 号：TH117[机械工程—机械设计及理论]