Jiahong Li, Dejun Kong
College of Mechanical Engineering, Changzhou University, Changzhou 213164, China.
Changzhou High Technology Research Key Laboratory of Mould Advanced Manufacturing, Changzhou University, Changzhou 213164, China.
Materials (Basel). 2018 Jan 15;11(1):137. doi: 10.3390/ma11010137.
Cr-Ni coatings with the mass ratios of 17% Cr-83% Ni, 20% Cr-80% Ni and 24% Cr-76% Ni were fabricated on H13 hot work mould steel using a laser cladding (LC). The surface-interface morphologies, chemical elements, surface roughness and phase composition of the obtained Cr-Ni coatings were analysed using a scanning electron microscope (SEM), energy disperse spectroscopy (EDS), atomic force microscope (AFM) and X-ray diffractometer (XRD), respectively. The friction-wear properties and wear rates of Cr-Ni coatings with the different mass ratios of Cr and Ni at 600 °C were investigated, and the worn morphologies and wear mechanism of Cr-Ni coatings were analysed. The results show that the phases of Cr-Ni coatings with mass ratios of 17% Cr-83% Ni, 20% Cr-80% Ni and 24% Cr-76% Ni are composed of Cr + Ni single-phases and their compounds at the different stoichiometry, the porosities on the Cr-Ni coatings increase with the Cr content increasing. The average coefficient of friction (COF) of 17% Cr-83% Ni, 20% Cr-80% Ni and 24% Cr-76% coatings are 1.10, 0.33 and 0.87, respectively, in which the average COF of 20% Cr-80% Ni coating is the lowest, exhibiting the better anti-friction performance. The wear rate of 17% Cr-83% Ni, 20% Cr-80% Ni and 24% Cr-76% Ni coatings is 4.533 × 10, 5.433 × 10, and 1.761 × 10 N·s, respectively, showing the wear resistance of Cr-Ni coatings at a high temperature increases with the Cr content, in which the wear rate is 24% Cr-76% Ni coating with the better reducing wear. The wear mechanism of 17% Cr-83% Ni and 20% Cr-80% Ni and 24% Cr-76% coatings at 600 °C is primarily adhesive wear, and that of 24% Cr-76% coating is also accompanied by oxidative wear.
采用激光熔覆（LC）工艺在H13热作模具钢上制备了Cr质量分数分别为17%、Ni质量分数为83%，Cr质量分数为20%、Ni质量分数为80%，以及Cr质量分数为24%、Ni质量分数为76%的Cr-Ni涂层。分别利用扫描电子显微镜（SEM）、能谱仪（EDS）、原子力显微镜（AFM）和X射线衍射仪（XRD）对所制备Cr-Ni涂层的表面-界面形貌、化学元素、表面粗糙度和相组成进行了分析。研究了不同Cr、Ni质量比的Cr-Ni涂层在600℃时的摩擦磨损性能和磨损率，并分析了Cr-Ni涂层的磨损形貌和磨损机制。结果表明，Cr质量分数为17%、Ni质量分数为83%，Cr质量分数为20%、Ni质量分数为80%，以及Cr质量分数为24%、Ni质量分数为76%的Cr-Ni涂层的相组成均为Cr + Ni单相及其不同化学计量比的化合物，Cr-Ni涂层的孔隙率随Cr含量的增加而增大。17%Cr-83%Ni、20%Cr-80%Ni和24%Cr-76%涂层的平均摩擦系数（COF）分别为1.10、0.33和0.87，其中20%Cr-80%Ni涂层的平均COF最低，表现出较好的减摩性能。17%Cr-83%Ni、20%Cr-80%Ni和24%Cr-76%Ni涂层的磨损率分别为4.533×10、5.433×10和1.761×10N·s，表明Cr-Ni涂层的高温耐磨性随Cr含量的增加而提高，其中24%Cr-76%Ni涂层的磨损率降低效果较好。17%Cr-83%Ni、20%Cr-80%Ni和24%Cr-76%涂层在600℃时的磨损机制主要为粘着磨损，24%Cr-76%涂层还伴有氧化磨损。
