采用磁控共溅射工艺在火炮身管PCrNi3Mo钢材料表面沉积了(Cr0.5 Al0.5)1-xVxN(x=0%~10.6%,原子分数)涂层。利用电子探针显微分析仪(EPMA)、X射线衍射仪(XRD)、扫描电镜(SEM)对涂层的组成、微观形貌与相结构进行了表征,研究了V含量对涂层微观结构和形貌的影响。结果表明V的加入使得涂层中出现了CrVN新晶相,且随着V含量的增加CrVN特征峰越来越明显,晶粒簇尺寸减小,V元素起到了一定的细化晶粒簇作用。利用纳米压痕仪及摩擦试验机对涂层的硬度、弹性模量和摩擦系数进行了测试,研究了 V 含量对(Cr0.5 Al0.5)1-x Vx N涂层性能的影响。结果表明V含量在7.2%时涂层硬度和弹性模量达到最大值,分别为21.36 GPa和297.8 GPa；随着V含量的增加,涂层的摩擦系数逐渐减小,当 V含量在10.6%时,涂层摩擦系数平均值为0.094,表现出良好的摩擦磨损性能。
(Cr0.5 Al0.5 )1-xVxN(x=0%-10.6at%)coatings were deposited on PCrNi3Mo steel by magnetron co-sputtering.The micro-morphology,composition and phase structure of the coatings were characterized by electron probe micro-analyzer(EPMA),X-ray diffraction (XRD)and scanning electron microscopy (SEM),respectively.The effect of V content on the phase structure and micro-morphology of (Cr0.5 Al0.5 )1-x Vx N coatings were investigated. The results showed that the new phase of CrVN appeared in the (Cr0.5 Al0.5 )1-x Vx N coatings by adding vanadium ele-ment,and the characteristic peak of CrVN was more and more obvious with the increasing of vanadium content.Scan-ning electron microscope manifests that the grain colonies size decreased with the increasing of vanadium content.Va-nadium element plays a certain role in grain colonies refinement.The hardness,elastic modulus and friction coefficient of coatings were tested using nano-indentation and friction testing machine,and the effect of vanadium content on the properties of (Cr0.5 Al0.5 )1-x Vx N coatings were investigated.The results show that the (Cr0.5 Al0.5 )1-x Vx N coatings with 7.2at% vanadium content has favorable mechanical properties including the maximum values of hardness(21.36 GPa)and elastic modulus (297.8 GPa).The friction coefficient of the coatings decreased gradually with the increase of vanadium content,and the average friction coefficient of the coating with 10.6at% vanadium content was 0.094, which showed good friction and wear properties.
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