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Abrasive Wear of DLC/PVD Multilayer Coatings: AFM Studies

机译：DLC / PVD多层涂层的磨料磨损：AFM研究

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摘要

The tribological behaviour of multilayered coatings deposited on plain carbon steel was investigated by microscale abrasion tests (MSATs). The multilayered coatings consisted of an outer diamond-like carbon (DLC) layer, a physical vapour deposition (PVD) nitride-based interlayer, and an inner electroless Ni-P layer. PVD TiN- and Ti(C,N)-coated samples with and without the DLC outer layer were studied in order to evaluate the influence of each layer on the tribological behaviour of the multilayer-coated system. The MSATs were carried out using a device based on ball-cratering geometry: a hard steel sphere was rotated against the coated specimen in the presence of an aqueous suspension of SiC particles. The wear coefficients of the multilayers were calculated from the diameter of the wear craters. The morphology of the wear scars produced by the MSATs was studied by atomic force microscopy (AFM). The wear damage was described by measuring the r.m.s. roughness (S_q) on the sides of the wear craters. Roughness values were related to the wear coefficients (k_c) for the different multilayers on the basis of mathematical elaboration typical of the 'design of experiment' (DOE) statistical technique. The presence of the DLC outer layer reduced the roughness of the crater sides and significantly increased the wear resistance of the multilayer only in the case of the PVD TiN sublayer.
机译：通过微尺度磨耗试验（MSAT）研究了沉积在普通碳钢上的多层涂层的摩擦学行为。多层涂层由外部类金刚石碳（DLC）层，基于物理气相沉积（PVD）氮化物的中间层和内部化学镀Ni-P层组成。为了评估每一层对多层涂层系统的摩擦学性能的影响，研究了有无DLC外层的PVD TiN和Ti（C，N）涂层样品。使用基于弹坑几何学的装置进行MSAT：在SiC颗粒的水悬浮液存在下，将硬钢球相对于涂层试样旋转。由磨损弹坑的直径计算出多层的磨损系数。通过原子力显微镜（AFM）研究了MSAT产生的磨损痕迹的形态。磨损损坏通过测量r.m.s.磨损坑侧面的粗糙度（S_q）。根据“实验设计”（DOE）统计技术的典型数学阐述，粗糙度值与不同多层的磨损系数（k_c）相关。仅在PVD TiN子层的情况下，DLC外层的存在降低了凹坑侧面的粗糙度并显着提高了多层的耐磨性。

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