成分梯度ZrN膜层的制备及摩擦学行为

Preparation and Tribological Behavior of Compositionally Graded ZrN Coatings

采用离子镀技术在2Cr13不锈钢基体上制备了4种不同成分梯度的ZrN膜层。采用辉光放电光谱仪（GDS）考察了膜层中主要元素的分布情况，采用显微硬度仪测试了膜层的静态承载能力，在球一盘磨损试验机上考察了不同成分梯度ZrN膜层的摩擦学行为。结果表明：成分梯度过密，会使膜／基结合强度降低，静态承载能力变差；而无成分梯度，则会使膜层的脆性增大，抗疲劳性能变差；当选择3～8层且每层厚度大于0．5μm的成分梯度结构，会显著缓解膜层与基体之间应力分布的不连续性，增加膜层韧性、膜／基结合强度及静态承载能力，从而显著提高ZrN膜层的摩擦学性能。

Four kinds of different compositionally graded ZrN coatings were prepared on 2Cr13 stainless steel by ion plating. The element distribution on the layer depth was analyzed by glow discharge spectrometer （GDS）. The supporting capacities under static load conditions of these coatings were evaluated using a micro-hardness tester. The tribological behaviors of compositionally graded ZrN coatings were investigated on the basis of a ball-disk wear tester. The results show that the coating/substrate bonding strength and the supporting capacity of coatings will be reduced if its compositionally graded is too small. However, the ductility and the resistance of the fatigue property of coatings will be deceased if it is no compositionally graded. When the compositionally graded of coatings is 3-8 layers and the thickness of every layer is more than 0.5 μm, the tribological property of ZrN coatings will be improved obviously because it will reduce the discontinuity of stresses between the coating and substrate and increase the ductility, the coating/substrate bonding strength and the supporting capacity.