激光熔覆制备高端液压支架表面涂层过程中显微气孔的研究

Research on Microscopic Porosity in Surface Coating of High-end Hydraulic Support by Laser Cladding

根据当前煤矿机械化开采的发展趋势以及综采工作面安全高效的生产要求,激光熔覆制备高端液压支架的应用日益增多。针对制备过程中涂层表面出现的气孔问题进行研究,通过金相显微镜观察到涂层表面存在4种典型的显微气孔形貌,分析了形成原因。对涂层进行了硬度测试和盐雾腐蚀实验,研究了显微气孔对性能的影响,最后提出了减少气孔的措施,以提高激光熔覆制备高端液压支架表面涂层的质量。

According to the current development trend of mechanized mining and the safe and efficient production requirements of fully mechanized mining face,the application of laser cladding to prepare high-end hydraulic supports is increasing.The porosity appearing on the surface of the coating during the preparation process were studied.Four typical microscopic porosity morphology were observed on the surface of the coating by metallographic microscope,and the formation reasons were analyzed.Hardness test and salt spray corrosion test were carried out on the coating,and the effect of microscopic porosity on performance was researched.Finally,the measures to reduce the pores were proposed to improve the quality of the surface coating of the high-end hydraulic support prepared by laser cladding.