Yang Liguang, Ma Wensuo, Gao Fei, Xi Shiping
School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang 471023, China.
Luoyang Bearing Research Institute Co., Ltd., Luoyang 471039, China.
Materials (Basel). 2022 Jun 22;15(13):4419. doi: 10.3390/ma15134419.
Laser surface texture is very effective in antifriction systems, but its applications and research in dry friction are not enough. In this study, the groove texture was prepared on the surface of 0Cr17Ni7Al stainless steel, a common material of sliding bearing, by nanosecond and femtosecond laser, respectively. The tribological properties of the two kinds of laser groove textures with different collision frequencies were studied in depth. The results show that the friction coefficients of groove texture prepared by nanosecond and picosecond lasers are lower than that of the untextured surface. The antifriction characteristics of the laser texture are very good. The average friction coefficient of nanosecond texture at the rotation radius of 15 mm is Z = 0.7318. The best friction-reducing effect is achieved. In general, the friction coefficient of nanosecond texture is lower than that of picosecond texture. When the friction radius is 22.5 mm and the number of collisions is 24,000, the lowest picosecond texture wear rate is = 3.342 × 10 mm/N·mm. However, when the radius is 15 mm and the collision frequency is 36,000 times, the wear rate of nanosecond texture reaches the highest = 13.680 × 10 mm/N·mm. The wear rate of the untextured surface has been exceeded. It can be seen that not all rotation radius textures are more wear-resistant than untextured surfaces. In addition, nanosecond groove texture and picosecond groove texture seem to produce different tribological properties. It is found that, under the same friction experimental conditions, different collision frequencies will affect the friction and wear properties of nanosecond and picosecond groove-textured surfaces.
激光表面织构在减摩系统中非常有效，但在干摩擦方面的应用和研究还不够。在本研究中，分别采用纳秒激光和飞秒激光在滑动轴承常用材料0Cr17Ni7Al不锈钢表面制备了沟槽织构。深入研究了两种具有不同碰撞频率的激光沟槽织构的摩擦学性能。结果表明，纳秒激光和皮秒激光制备的沟槽织构的摩擦系数均低于未织构表面。激光织构的减摩特性非常好。纳秒织构在旋转半径为15 mm时的平均摩擦系数Z = 0.7318，达到了最佳的减摩效果。一般来说，纳秒织构的摩擦系数低于皮秒织构。当摩擦半径为22.5 mm且碰撞次数为24000次时，皮秒织构的最低磨损率为 = 3.342×10 mm/N·mm。然而，当半径为15 mm且碰撞频率为36000次时，纳秒织构的磨损率达到最高 = 13.680×10 mm/N·mm，超过了未织构表面的磨损率。可见，并非所有旋转半径的织构都比未织构表面更耐磨。此外，纳秒沟槽织构和皮秒沟槽织构似乎产生了不同的摩擦学性能。研究发现，在相同的摩擦实验条件下，不同的碰撞频率会影响纳秒和皮秒沟槽织构表面的摩擦磨损性能。
