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为预测等离子体喷涂所获得涂层的孔隙率、表面粗糙度等性质及其与喷射的熔融颗粒的直径、速度、温度等参数间的关系,采用基于对涂层形成机理分析所建立的一组基本法则,并假设被喷涂的处于熔融状态的颗粒的直径、温度、速度及撞击于基板的位置均为Gauss型分布,对涂层形成进行了模拟研究。结果表明:涂层中总是存在孔隙;熔融颗粒的平均直径愈大,则所得涂层孔隙率愈小;涂层愈厚,其表面也愈粗糙;随着熔融颗粒平均速度或平均温度的升高,涂层孔隙率与表面粗糙度均减小,这与实验观察一致。
In order to predict the porosity, surface roughness and other properties of coatings obtained by plasma spraying and their relationship with parameters such as the diameter, velocity and temperature of the sprayed molten particles, a set of parameters based on the analysis of coating formation mechanism The basic law, and assuming that the diameter, temperature, velocity and location of the impinging particles on the substrate being sprayed are both Gauss-type distributions, the formation of coating is simulated. The results show that there are always pores in the coating. The larger the average diameter of the melted particles, the smaller the porosity of the obtained coating. The thicker the coating, the rougher the surface. With the increase of average melt temperature or average temperature High, the coating porosity and surface roughness are reduced, which is consistent with the experimental observation.