Tribological performance evaluation of (1 1 1) preferred oriented TiN duplex coatings
Tribological performance evaluation of (1 1 1) preferred oriented TiN duplex coatings
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(1 1 1)优先取向TiN双相涂层的摩擦学性能评估
作者：
J. Ishii;Y. Haruyama;S. Kawamura;N. Horikawa;Y. Iwai
热作工具钢的双重表面涂层，包括基体的氮化和TiN层的涂层，已经成为一系列研究的主题，作为工具和机器部件的潜在表面改性。通过对无润滑条件下铝合金的滑动磨损试验，在磨损图上发现了两个区域：磨损区域和转移区域。在这项研究中，专注于改善的摩擦学性能的双涂层的磨损域，膜特性对膜耐冲蚀磨损和膜寿命的影响进行了研究。采用空心阴极放电离子镀技术制备了两种具有不同膜层特性的复合膜层：具有强（111）取向的新型TiN膜层和具有（111）和（200）取向的普通TiN膜层。采用微射流冲蚀磨损试验研究了复合涂层的冲蚀磨损性能.膜寿命通过如在先前实验中对铝合金的滑动试验来评估。结果表明，与新开发的TiN膜（N-涂层）的双涂层显示出更高的耐腐蚀性比以前报道的双涂层（C-涂层）。从滑动试验中还发现，（111）与（200）的XRD强度比超过100的N-涂层显示出只有碎裂的磨损模式，没有划痕，这缩短了膜寿命。N-涂层的膜寿命比C-涂层增加约两倍，C-涂层显示出比常规双涂层更高的性能。讨论了N涂层改善摩擦学性能的可能机制。
The duplex surface coating of hot work tool steel, which comprises nitriding of a substrate and coating of a TiN layer, has been the subject of a series of studies as a potential surface modification for tools and machine parts. Through sliding experiment against an aluminum alloy without lubrication, it was shown on a wear map that there are two domains depending on sliding conditions: the wear domain and the transfer domain. In this study, focusing on the improvement in the tribological properties of the duplex coating in terms of the wear domain, the effects of film characteristics on film resistance to erosion wear and film life were investigated. Two kinds of duplex coatings with different film characteristics were prepared by hollow cathode discharge ion plating: a newly developed TiN film with a strong (111) orientation and an ordinary TiN film with (111) and (200) orientations. The erosion wear rate of duplex coating was evaluated by a micro slurry jet erosion test. Film life was evaluated by a sliding test against an aluminum alloy as in previous experiments. It was revealed that the duplex coating with the newly developed TiN film (N-coating) shows higher erosion resistance than previously reported duplex coating (C-coating). From the sliding test, it was also revealed that the N-coating whose XRD intensity ratio of (111) to (200) is over 100 shows a wear mode with only chipping, with no scratching, which shortens film life. The film life of N-coating increases about twice as long as C-coating, which has shown higher performance than a conventional duplex coating. Possible mechanisms of the improvement in the tribological properties with N-coating are discussed.