Evaluation of tribological properties of advanced thin hard coatings and acceralated wear test.

为了快速评价薄层、单层或多层涂层的摩擦学性能，提出了一种新型的固体颗粒冲击试验--浆体射流试验。(1)研究了冲击角度、冲击压力、料浆浓度和冲蚀颗粒大小对高速钢基体上PVD TiN涂层磨损的影响。还发现，疤痕上的最大深度适合于评价磨损性能，并且我们的测试方法产生可重现的结果。(2)通过浆料喷射，1 μ m氧化铝颗粒以高速垂直于TiN、TiN/NbN、TiN/TaN、TiN/CrN、TiN/TiAlN的薄PVD涂层撞击，涂层被证明具有比基体材料高得多的耐冲蚀性，并且，因此，当涂层被穿透时，磨损率显著增加到高速钢材料的较高水平。耐冲蚀性的排名和相关的机械性能，如硬度和临界法向负荷划痕试验得到的讨论。(3)CrNi涂层的耐磨性随Ni含量的增加而降低。(4)软DLC涂层在涂层与基体材料之间的弱界面处断裂。硬质DLC涂层局部断裂，从而暴露基底。(5)我们的结论是，建议的评估测试是快速和容易完成。因此，在评估涂层和涂层材料时，它可以优先用作筛选试验。

We proposed slurry jet, a new type of solid particle impact test, in order to quickly evaluate tribological properties of thin, single layered or multilayered coatings.(1) The effects of impact angle, impact pressure, concentration of slurry and erodent size on the wear of PVD TiN deposited on a high speed steel (HSS) substrate material were clarified. It was also found that maximum depth on the scar is suitable to evaluate wear properties and our test method generates reproducible results.(2) By slurry jet 1 um alumina particles were impacted at high velocity perpendicular to thin PVD coatings of TiN, TiN/NbN, TiN/TaN, TiN/CrN, TiN/TiAlN, the coatings proved to have much higher erosion resistance than the substrate material, and, consequently, the wear rate increased significantly to the higher level of the HSS material when the coatings were penetrated. The ranking of erosion resistance and correlation to the mechanical properties, such as hardness and critical normal load obtained by scratch testing are discussed.(3) The wear resistance of CrNi coatings decrease with increasing the concentration of Ni.(4) Soft DLC coating fractures at the weak interface between coating and substrate material. Hard DLC coating fractures locally and thus substrate exposes.(5) We conclude that the proposed evaluation test is fast and easy to accomplish. Thus, it can preferentially be used as a screening test when evaluating coatings and coated materials.