Continuous growth of traditional monolayer CrN coatings up to 24 h is successfully achieved to fabricate ultrathickness of up to 80 μm on the 316 stainless steel substrate using a multiarc ion plating technique. The microstructures, mechanical properties, and tribological properties evolution with the CrN coating continuously growing was evaluated in detail. The transmission electron microscopy observations and inverse Fourier-filtered images reveal a relaxation mechanism during the continuous growth of CrN coating, which can lead to a decrease in the residual stress when coating growth time exceeds 5 h. The scratch test and friction test results both show that the load-bearing capacity of coating is significantly increased as CrN coatings growing thicker. During the scratch test, the ultrathick CrN coating of thickness 80.6 μm is not failed under the load of 180 N, and the dominant failure mechanism is the cohesive failure including wedge spallation and cracking. The dry-sliding friction test results show the mean coefficient of friction and the wear rate of ultrathick CrN are respectively decreased by 17.2 and 56.8% at most compared with the thin coating (thickness is 5.4 μm). The ultrahigh load-bearing capacity and excellent tribological property are attributed to the relaxation mechanism and limited contact pressure as the coating grows continuously.

中文翻译：

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连续生长超厚CrN涂层以实现高承载能力和良好的摩擦学性能

传统的单层CrN涂层可以连续生长长达24小时，从而利用多弧离子镀技术在316不锈钢基底上制造出高达80μm的超厚膜。详细评估了随着CrN涂层的不断生长，其微观结构，力学性能和摩擦学性能的演变。透射电子显微镜观察和傅立叶逆滤波图像揭示了CrN涂层连续生长过程中的弛豫机理，当涂层生长时间超过5 h时，这可能导致残余应力的降低。划痕试验和摩擦试验结果均表明，随着CrN涂层厚度的增加，涂层的承载能力显着提高。在划痕测试过程中，厚度为80的超厚CrN涂层。在180 N的载荷下6μm不会失效，主要的失效机理是包括楔形剥落和裂纹在内的内聚破坏。干滑动摩擦试验结果表明，与薄涂层（厚度为5.4μm）相比，超厚CrN的平均摩擦系数和磨损率分别最多降低了17.2和56.8％。超高的承重能力和优异的摩擦学性能归因于松弛机制和随着涂层连续生长而产生的有限接触压力。与薄涂层（厚度为5.4μm）相比，最多为8％。超高的承重能力和优异的摩擦学性能归因于松弛机制和随着涂层不断增长而产生的有限接触压力。与薄涂层（厚度为5.4μm）相比，最多为8％。超高的承重能力和优异的摩擦学性能归因于松弛机制和随着涂层连续生长而产生的有限接触压力。