Smyrnova Kateryna, Sahul Martin, Haršáni Marián, Pogrebnjak Alexander, Ivashchenko Volodymyr, Beresnev Vyacheslav, Stolbovoy Vyacheslav, Čaplovič Ľubomír, Čaplovičová Mária, Vančo Ľubomír, Kusý Martin, Kassymbaev Alexey, Satrapinskyy Leonid, Flock Dominik
Department of Nanoelectronics and Surface Modification, Sumy State University, Rymskogo-Korsakova 2, 40007 Sumy, Ukraine.
Institute of Materials Science, Slovak University of Technology in Bratislava, Jána Bottu 25, 917 24 Trnava, Slovakia.
Nanomaterials (Basel). 2022 Jan 26;12(3):395. doi: 10.3390/nano12030395.
Due to the increased demands for drilling and cutting tools working at extreme machining conditions, protective coatings are extensively utilized to prolong the tool life and eliminate the need for lubricants. The present work reports on the effect of a second MeN (Me = Zr, Cr, Mo, Nb) layer in WN-based nanocomposite multilayers on microstructure, phase composition, and mechanical and tribological properties. The WN/MoN multilayers have not been studied yet, and cathodic-arc physical vapor deposition (CA-PVD) has been used to fabricate studied coating systems for the first time. Moreover, first-principles calculations were performed to gain more insight into the properties of deposited multilayers. Two types of coating microstructure with different kinds of lattices were observed: (i) face-centered cubic (fcc) on fcc-WN (WN/CrN and WN/ZrN) and (ii) a combination of hexagonal and fcc on fcc-WN (WN/MoN and WN/NbN). Among the four studied systems, the WN/NbN had superior properties: the lowest specific wear rate (1.7 × 10 mm/Nm) and high hardness (36 GPa) and plasticity index H/E (0.93). Low surface roughness, high elastic strain to failure, NbO and WO tribofilms forming during sliding, ductile behavior of NbN, and nanocomposite structure contributed to high tribological performance. The results indicated the suitability of WN/NbN as a protective coating operating in challenging conditions.
由于对在极端加工条件下工作的钻孔和切削工具的需求不断增加，保护性涂层被广泛用于延长刀具寿命并消除对润滑剂的需求。本工作报道了基于WN的纳米复合多层膜中第二MeN（Me = Zr、Cr、Mo、Nb）层对微观结构、相组成以及机械和摩擦学性能的影响。WN/MoN多层膜尚未被研究过，并且首次使用阴极电弧物理气相沉积（CA-PVD）来制备所研究的涂层系统。此外，进行了第一性原理计算以更深入地了解沉积多层膜的性能。观察到两种具有不同晶格类型的涂层微观结构：（i）fcc-WN（WN/CrN和WN/ZrN）上的面心立方（fcc）结构，以及（ii）fcc-WN（WN/MoN和WN/NbN）上的六方和fcc结构的组合。在所研究的四个系统中，WN/NbN具有优异的性能：最低的比磨损率（1.7×10⁻⁶mm²/Nm）、高硬度（36 GPa）和塑性指数H/E（0.93）。低表面粗糙度、高弹性失效应变、滑动过程中形成的NbO和WO摩擦膜、NbN的韧性行为以及纳米复合结构促成了高摩擦学性能。结果表明WN/NbN作为在具有挑战性条件下运行的保护涂层的适用性。
