Investigation into three-dimensional laser processing of tribological coatings
Investigation into three-dimensional laser processing of tribological coatings
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DOI：
10.1016/s0257-8972(98)00543-x
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发表时间：
1998-08
影响因子：
5.4
通讯作者：
A. Voevodin;J. Bultman;J. Zabinski
中科院分区：
文献类型：
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作者：
A. Voevodin;J. Bultman;J. Zabinski
摩擦学涂层设计已经从单层/单相发展到多层和复合结构。早期的单层涂层在阻止裂缝、分配载荷、放松应力和防止粘合剂失效方面效率不高。第二代涂层采用多层、梯度和复合结构，为涂层设计增加了另一个维度，可以更好地调节应力和止裂。本文考虑涂层设计的进一步演变到三维，其中横向性能变化被添加到横向厚度性能变化。三维设计通过允许在摩擦触点内补充固体润滑剂，大大改善了硬涂层的摩擦学特性。采用一种功能梯度Ti-TiC-TiC /类金刚石碳涂层，上层为坚韧的纳米晶/非晶复合材料，用于负载支撑、裂纹预防和应力均衡。该涂层采用激光辐照形成沿磨损路径的沟槽轨迹，然后用二硫化钼填充。这在涂层的横向尺寸上提供了一个固体润滑剂储层。在固定湿度和循环湿度下对三维涂层进行了长时间滑动试验。涂层具有良好的环境适应性，在湿空气条件下摩擦系数为0.15，在干氮条件下摩擦系数为0.02。与没有任何三维激光处理的mos2顶层硬梯度涂层相比，其磨损寿命至少提高了一个数量级。讨论了三维涂层的摩擦学性能和摩擦磨损机理。通过三维涂层加工实现的环境适应性对航空航天应用是有益的。
Tribological coating design has evolved from single layer/single phase to multilayer and composite architectures. The early single-layer coatings were not efficient for arresting cracks, distributing loads, relaxing stress, and preventing adhesive failures. Second-generation coatings with multilayer, gradient, and composite architectures added another dimension to the coating design and allowed much better accommodation of stresses and crack arresting. This paper considers the further evolution of coating design to three dimensions, where the lateral property variation was added to the cross-thickness property variation. The three-dimensional design considerably improved the tribological characteristics of hard coatings, by permitting solid lubricant replenishment inside the friction contacts. A functionally gradient Ti–TiC–TiC/diamond-like carbon coating with an upper layer of a tough nanocrystalline/amorphous composite was used for load support, crack prevention, and stress equalization. This coating was processed with laser irradiation to form grooved tracks along wear paths, which were then filled with MoS2. This provided a solid lubricant reservoir in the lateral dimension of the coating. The three-dimensional coating was tested in long-duration sliding tests at fixed and cycling humidity. The coating exhibited environmental adaptation with friction coefficients of 0.15 in humid air and 0.02 in dry nitrogen. The wear life was increased by at least one order of magnitude in comparison to that for a hard gradient coating with a top layer of MoS2without any three-dimensional laser processing. Discussions of three-dimensional coating tribological properties, friction and wear mechanisms are provided. The environmental adaptation achieved with three-dimensional coating processing can be beneficial for aerospace applications.