Triboactive CrAlN+X hybrid dcMS/HPPMS PVD nitride hard coatings for friction and wear reduction on components
Triboactive CrAlN+X hybrid dcMS/HPPMS PVD nitride hard coatings for friction and wear reduction on components
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DOI：
10.1016/j.surfcoat.2017.06.089
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发表时间：
2017-12
影响因子：
5.4
通讯作者：
K. Bobzin;T. Brögelmann;C. Kalscheuer
中科院分区：
文献类型：
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作者：
K. Bobzin;T. Brögelmann;C. Kalscheuer
环保意识和能源成本的提高是开发节能机器的主要驱动力。同时，提高的能源效率往往导致更高的功率密度。除了类金刚石碳（DLC）涂层外，通过物理气相沉积（PVD）沉积的氮化物硬质涂层显示出降低机器部件磨损的高潜力。然而，关于润滑摩擦接触中的摩擦降低，氮化物硬涂层仍然表现出对研究的高需求，因为最先进的润滑剂被定制为与钢表面相互作用以形成摩擦降低摩擦层。因此，在氮化物硬质涂层中添加摩擦活性元素（X）是一种很有前途的方法，以增强与润滑剂的摩擦学相互作用，并降低摩擦。分析了氮化物硬质涂层（Cr，Al）N + X与润滑剂之间的摩擦学相互作用。因此，研究了基于矿物油的参考和掺杂有硫添加剂的矿物油在摩擦学条件下与涂层的相互作用。在表面硬化钢AISI5115（16MnCr5E）上采用低温T ≤ 200 ° C混合PVD涂层工艺沉积涂层。研究了涂层和复合材料的性能。在销盘式摩擦磨损试验机上测试了涂层与惰性陶瓷Si3N4配对体的摩擦学性能。试验在温度T = 90 ° C和T = 130 ° C，赫兹接触压力p0 ≤ 1，600 MPa和p0 ≤ 1，900 MPa下进行。在一定的摩擦学条件下，通过在涂层中加入摩擦活性元素Mo，可以达到降低摩擦的目的。拉曼光谱表明，MoS2在摩擦学试验过程中原位生成。因此，研究（Cr，Al）N + Mo涂层是一种很有前途的方法，在高负荷摩擦学系统中的减摩。
Increasing environmental awareness and energy costs are major driving forces behind the development of energy efficient machines. Simultaneously, increased energy efficiency often leads to higher power densities. Besides diamond-like carbon (DLC) coatings, nitride hard coatings deposited by physical vapor deposition (PVD) show a high potential for wear reduction on machine components. However, regarding friction reduction in lubricated tribological contacts, nitride hard coatings still exhibit a high demand for research since state-of-the art lubricants are tailored to interact with steel surfaces in order to form friction reducing tribolayers. Therefore, the addition of triboactive elements (X) into nitride hard coatings is a promising approach to enhance tribological interactions with lubricants and to reduce friction. The aim of the paper is the analysis of the tribological interaction between the nitride hard coating (Cr,Al)N+X and lubricants. Therefore, a mineral oil based reference and a mineral oil doped with a sulphur additive were investigated regarding interactions with the coatings under tribological conditions. The coatings were deposited in a low temperatureT≤ 200 °C hybrid PVD coating process on case hardened steel AISI5115 (16MnCr5E). The coating and compound properties were investigated. The tribological behavior of the coatings was tested in a pin on disc (PoD) tribometer against inert ceramic Si3N4counter bodies. The tests were conducted at temperaturesT= 90 °C andT= 130 °C at Hertzian contact pressures p0≈ 1,600 MPa and p0≈ 1,900 MPa. Under the given tribological conditions a friction reduction was achieved by adding the triboactive element Mo into the coatings. Raman spectroscopy revealed that MoS2was formed in-situ during the tribological tests. The investigated (Cr,Al)N+Mo coatings are therefore a promising approach for friction reduction in highly loaded tribological systems.