Slow speed and different normal forces were chosen for investigation of the friction under short impact sliding. The base material is a hydrogenated diamond-like carbon coating (a-C:H). The coating was modified by femtosecond laser micro-patterning (µ-patterning). Three different µ-patterns were generated in the hydrogenated diamond-like carbon (DLC) coating and compared with a-C:H in the “as-deposited” condition. The sliding behaviour was demonstrated without an intermediate medium and with fluid addition. In the latter case, hyaluronic acid gel (HYA) was added. Gentle or deep dimpling by local femtosecond laser ablation resulted in a significantly more variable coefficient of friction (COF) curvature. During dry sliding of the diamond tip against the laser µ-patterned a-C:H, a zig-zag shape of the COF curve was observed. For deep laser µ-patterned DLC under high normal force of 10 N, sudden switches to very low COF down to 0.02 occurred when HYA was added. For hydrogenated DLC with gentle laser µ-patterning, the lowest COF were observed in this study under hyaluronic gel lubrication and low normal forces of 1 N. A volume expansion of the DLC and negative coefficients of friction were observed after loading with 1 N for some coating variants. For laser-induced periodic surface structured (LIPSS) DLC, at low loads of 1 N the COF became higher while at high normal forces like 10 N, a positive trend of LIPSS on the friction behaviour were seen under hyaluronic gel addition. Laser µ-patterning effected graphitization of small or large regions of the a-C:H coating. The defect-rich graphite sections on laser µ-patterned DLCs influenced the crystallisation behaviour of HYA and its distribution.

选择慢速和不同的法向力来研究短冲击滑动下的摩擦。基材是氢化类金刚石碳涂层 (aC:H)。通过飞秒激光微图案化（μ-patterning）对涂层进行了修改。在氢化类金刚石碳 (DLC) 涂层中生成了三种不同的微米图案，并与“沉积”条件下的 aC:H 进行比较。在没有中间介质和添加流体的情况下证明了滑动行为。在后一种情况下，添加透明质酸凝胶 (HYA)。局部飞秒激光烧蚀产生的柔和或深凹坑导致摩擦系数 (COF) 曲率的变化明显更大。在金刚石尖端对激光 µ 图案 aC:H 的干滑动期间，观察到 COF 曲线的锯齿形。对于在 10 N 的高法向力下的深激光 µ 图案 DLC，添加 HYA 时会突然切换到非常低的 COF，降至 0.02。对于具有温和激光 µ 图案的氢化 DLC，在本研究中在透明质凝胶润滑和 1 N 的低法向力下观察到最低的 COF。在加载 1 N 后观察到 DLC 的体积膨胀和负摩擦系数涂层变体。对于激光诱导的周期性表面结构 (LIPSS) DLC，在 1 N 的低负载下，COF 变得更高，而在 10 N 等高法向力下，在添加透明质酸凝胶的情况下，可以看到 LIPSS 对摩擦行为的积极趋势。激光 µ 图案影响 aC:H 涂层的小区域或大区域的石墨化。