论文部分内容阅读
以镍基碳化钨粉末为喷涂原料,采用等离子喷涂和乙炔焰喷焊方法对汽车焊装夹具进行了表面改性处理,研究了不同热喷涂工艺下涂层的显微形貌、物相组成和孔隙率的变化规律,并对比分析了两种不同工艺下涂层的耐磨性能。结果表明,等离子喷涂涂层和乙炔焰喷焊涂层的物相组成均为γ-Ni、W_2C、Cr_7C_3和WC,涂层中都可见灰色区域、亮白色区域和黑色孔隙缺陷;乙炔焰喷焊涂层中的孔隙率要相对等离子喷涂涂层中更小;汽车焊装夹具基材的磨损机制为磨粒磨损和粘着磨损,而等离子喷涂涂层和乙炔焰喷焊涂层磨损机制为粘着磨损。
The nickel-based tungsten carbide powder is used as a raw material for spraying, the surface of the welding fixture is modified by the plasma spraying method and the acetylene flame spray welding method, the microscopic morphology, the phase composition and the phase composition of the coating under different thermal spraying processes are studied Porosity variation of the coating, and comparative analysis of the wear resistance of the coating under two different processes. The results show that the phase composition of plasma spray coating and acetylene flame spray coating are all γ-Ni, W_2C, Cr_7C_3 and WC. The coating shows gray area, bright white area and black pore defects. The porosity in the coating is smaller than that in the plasma spray coating; the wear mechanism of the automotive welding fixture substrate is abrasive wear and adhesive wear, while the wear mechanism of the plasma spray coating and acetylene flame spray coating is adhesive wear .