45钢表面TD-Cr/PVD-CrN复合涂层磨蚀性能  

Abrasive Properties of TD-Cr/PVD-CrN Composite Coatings on 45 Steel Surfaces

作　　者：罗银 万强 曹道成 杨泽华 李善军[1] 孟亮[1] 肖洋轶 韩明兴 LUO Yin;WAN Qiang;CAO Dao-cheng;YANG Ze-hua;LI Shan-jun;MENG Liang;XIAO Yang-yi;HAN Ming-xing(College of Engineering,Huazhong Agricultural University,Wuhan 420070,China)

机构地区：[1]华中农业大学工学院,武汉420070

出　　处：《表面技术》2023年第7期455-463,共9页Surface Technology

基　　金：国家自然科学基金(11905082,51905204);中央高校基本业务经费(2662020GXPY002)。

摘　　要：目的采用热扩散(TD)渗金属技术和物理气相沉积(PVD)技术对45钢表面进行强化,以提升45钢表面硬度和抗磨蚀性能,延长45钢的使用寿命。方法采用热扩散渗金属技术和物理气相沉积技术制备TD-Cr、PVD-CrN及TD-Cr/PVD-Cr N(Cr/CrN复合涂层)3种涂层。利用扫描电镜(SEM)、X射线衍射仪(XRD)研究涂层的微观形貌、元素分布和物相组成。通过纳米压痕研究涂层的硬度、弹性模量。通过摩擦磨损实验和电化学腐蚀实验,研究涂层的摩擦性能和腐蚀性能。结果TD-Cr、PVD-Cr N、TD-Cr/PVD-Cr N 3种涂层的组织结构均致密均匀,厚度分别为19.78、1.075、32.24μm。TD-Cr/PVD-Cr N涂层的硬度达到28.7 GPa,高于其他涂层,同时,Cr/Cr N复合涂层的弹性模量和弹性恢复能力均优于其他涂层。在盐水环境下,TD-Cr、PVD-Cr N、TD-Cr/PVD-CrN的摩擦因数分别为0.52、0.38、0.35,磨损体积分别为26、0.15、0.05,TD-Cr/PVD-CrN展现出较好的耐磨性能。在盐水环境下,TD-Cr/PVD-CrN涂层的抗腐蚀性能略低于TD-CrN涂层。结论综合看来,TD-Cr/PVD-CrN复合涂层可以有效提升45钢的表面抗磨蚀能力,延长其使用寿命。Thermal diffusion(TD)and vapor physical deposition(PVD)are effective means to strengthen metal surface.The surface hardness of metal can be improved by thermal diffusion(TD)chromizing,but the surface roughness of chromizing layer leads to the phenomenon that the wear rate is too high in the friction process,and the existence of metal elements in thermal diffusion chromizing treatment is not conducive to the surface corrosion resistance.The metal nitride coating prepared by vapor phase physical deposition(PVD)has the characteristics of high hardness,wear resistance and corrosion resistance,which is suitable to be combined with TD chromizing metal layer to form a low friction,wear resistance and corrosion resistance surface.Among them,CrN coating has stable friction coefficient,high wear and corrosion resistance,and is often used as a surface strengthening coating for easily worn parts.In this study,thermal diffusion(TD)metallization technology and physical vapor deposition(PVD)technology were used to strengthen the surface of 45 steel,so as to improve the surface hardness and abrasion resistance of 45 steel and prolong the service life of 45 steel.Firstly,the 45 steel substrate was chromized in a vacuum metallizing furnace.The chromizing process was to preheat at 500℃for 1 h,and heat to 960℃for 15 h,then cool to 200℃with the furnace,and cool to room temperature.Then,the CrN coating was deposited on 45 steel and TD-Cr coatings by vacuum multi arc ion plating technology,PVD-CrN coating and TD-Cr/PVD-CrN composite coating were prepared.The current and voltage in the deposition process were 160 A and 20 V,the N2 content ratio was 40%,the negative bias voltage was 70 V,the deposition temperature was 300℃,and the deposition time was 1 h.The microstructure,elements and phase composition of the coating were studied by scanning electron microscope(SEM)and X-ray diffraction(XRD).The hardness and Young's modulus of the coating were studied by nanoindentation.The tribological and corrosion properties of the coating we

关 键 词：45钢 TD-Cr/PVD-CrN涂层 力学性能 摩擦磨损 抗腐蚀性能 

分 类 号：TB34[一般工业技术—材料科学与工程]