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利用超音速火焰喷涂技术在结晶器铜板表面喷涂Cr3C2-25NiCr涂层,采用正交试验设计研究了不同工艺参数对涂层孔隙率的影响,并对涂层的表面、截面形貌和粉末及涂层的相组成等进行分析。研究结果发现,在喷涂过程中,Cr3C2-25NiCr涂层发生了不同程度的分解和氧化,而且喷涂距离对孔隙率的影响最大。本试验获得的最佳工艺参数为氧气流量900L/min,煤油流量6.0g/h,喷涂距离375mm,涂层厚度0.4mm,经过工艺优化后制备的Cr3C2-25NiCr涂层组织均匀致密,与基材结合良好,孔隙率较低。
Cr3C2-25NiCr coating was sprayed on the surface of mold copper by supersonic flame spraying technology. The influence of different process parameters on the porosity of coating was studied by orthogonal experimental design. The surface, cross-section morphology and powder coating of the coating Layer phase composition analysis. The results showed that during the spraying process, the Cr3C2-25NiCr coatings decomposed and oxidized to different degrees, and the spraying distance had the greatest influence on the porosity. The best process parameters obtained in this experiment were oxygen flux 900L / min, flow rate of kerosene 6.0g / h, spray distance 375mm and coating thickness 0.4mm. The microstructure of Cr3C2-25NiCr coating prepared by the process optimization was uniform and compact, Good combination of lower porosity.