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采用非平衡磁控溅射技术在Si3N4球及高速钢基体上制备了类金刚石(DLC)膜。采用UMT-II型球盘式摩擦磨损试验机分别考察了Si3N4球、镀DLC膜Si3N4球及GCr15球的摩擦学性能,并分析了不同滑动速度和载荷下Si3N4球表面DLC膜的摩擦学性能。研究结果表明:Si3N4球的摩擦系数及磨损率约为GCr15球的一半,但因Si3N4球脆性较大,在摩擦过程中摩擦接触表面容易剥落;Si3N4球表面镀DLC膜能有效地改善Si3N4球脆性大的弱点,并具有良好的减摩作用;Si3N4球表面DLC膜所组成摩擦副的平均摩擦系数随着载荷的增加而增大;随着速度的增加摩擦副的摩擦系数先增大而后减小,滑动速度对摩擦副摩擦系数的影响比载荷明显。实验结果表明Si3N4球表面镀DLC膜适合于高速轻载的工况。
Diamond-like carbon (DLC) films were prepared on Si3N4 spheres and high speed steel substrates by unbalanced magnetron sputtering. The tribological properties of Si3N4 spheres, Si3N4 spheres coated with DLC films and GCr15 spheres were investigated by UMT-II ball-type friction and wear tester. The tribological properties of DLC films on Si3N4 spheres under different sliding velocities and loads were analyzed. The results show that the friction coefficient and wear rate of Si3N4 ball are about half of that of GCr15 ball. However, due to the brittleness of Si3N4 ball, the frictional contact surface of Si3N4 ball peels off easily. DLC film on Si3N4 ball surface can effectively improve the brittleness of Si3N4 ball Big weakness, and has a good anti-friction effect; the average friction coefficient of friction pair formed by DLC film on Si3N4 ball surface increases with the increase of load; the friction coefficient of friction pair first increases and then decreases with the increase of speed The influence of sliding speed on the friction coefficient of friction pair is more obvious than the load. The experimental results show that the surface of DLC film coated Si3N4 ball suitable for high-speed light-load conditions.