He Xing, Kong Dejun, Song Renguo
School of Materials Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu, China.
Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, Jiangsu, China.
Materials (Basel). 2018 Jan 26;11(2):198. doi: 10.3390/ma11020198.
Al-TiC-CeO₂ composite coatings have been prepared by using a laser cladding technique, and the microstructure and properties of the resulting composite coatings have been investigated using scanning electron microscopy (SEM), a 3D microscope system, X-ray diffraction (XRD), micro-hardness testing, X-ray stress measurements, friction and wear testing, and an electrochemical workstation. The results showed that an Al-Fe phase appears in the coatings under different applied laser powers and shows good metallurgical bonding with the matrix. The dilution rate of the coating first decreases and then increases with increasing laser power. The coating was transformed from massive and short rod-like structures into a fine granular structure, and the effect of fine grain strengthening is significant. The microhardness of the coatings first decreases and then increases with increasing laser power, and the maximum microhardness can reach 964.3 HV. In addition, the residual stress of the coating surface was tensile stress, and crack size increases with increasing stress. When the laser power was 1.6 kW, the coating showed high corrosion resistance.
采用激光熔覆技术制备了Al-TiC-CeO₂复合涂层，并利用扫描电子显微镜（SEM）、三维显微镜系统、X射线衍射（XRD）、显微硬度测试、X射线应力测量、摩擦磨损测试和电化学工作站对所得复合涂层的微观结构和性能进行了研究。结果表明，在不同的激光功率下，涂层中出现了Al-Fe相，并且与基体表现出良好的冶金结合。涂层的稀释率随激光功率的增加先降低后升高。涂层由块状和短棒状结构转变为细粒状结构，细晶强化效果显著。涂层的显微硬度随激光功率的增加先降低后升高，最大显微硬度可达964.3 HV。此外，涂层表面的残余应力为拉应力，裂纹尺寸随应力的增加而增大。当激光功率为1.6 kW时，涂层表现出高耐蚀性。
