摘要
为进一步提高火炮身管寿命,利用磁控溅射技术在CrNi3MoVA钢表面沉积了Ta涂层。沉积态Ta涂层由体心立方相α-Ta和亚稳态四方相β-Ta组成,在850℃下真空退火3h后其全部转化为单一的α-Ta相。利用纳米压痕仪和摩擦磨损试验机测试了α-Ta涂层的硬度、弹性模量及摩擦系数,结合扫描电镜(SEM)、能谱(EDS)及掠入射X射线衍射(GIXRD)分析了涂层的微观结构,并与传统电镀硬Cr涂层进行比较,研究了α-Ta涂层的摩擦磨损性能。结果表明:α-Ta涂层的摩擦系数(0.70~0.80)略小于硬Cr涂层的摩擦系数(0.75~0.85),α-Ta涂层的磨损机制主要为粘着磨损,而硬Cr涂层的磨损机制主要为疲劳磨损和粘着磨损。
In order to prolong the life time of gun barrel,a Ta coating was prepared by means of magnetron sputtering technology.The as-deposited coating consists of a body-centered cubicα-Ta and a metastable tetragonalβ-Ta,and completely transforms intoα-Ta after 3 hvacuum annealing.The hardness,elasticity modulus and friction coefficient of theα-Ta coating were tested by utilizing nanoindentor and friction and wear testing machine.In contrast to the traditional hard chrome coating,the performance of friction and wear of theα-Ta coating was investigated by employing scanning electron microscope(SEM),energy dispersive spectrometer(EDS)and grazing incidence X-ray diffraction(GIXRD)to analyze the microstructure of the coatings.The results indicated that the friction coefficient of theα-Ta coating(0.70—0.80)is slightly lower than that of the hard chrome coating(0.75—0.85),and the wear mechanism of theα-Ta coating is mainly characterized as adherent wear while that of the hard chromium coating is fatigue and adherent one.
引文
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