用分形理论研究超音速电弧喷涂PS45涂层结合强度与喷涂电压的关系

采用超音速电弧喷涂设备制备PS45涂层，借助于扫描电镜和电子拉伸试验机对涂层的显微组织和结合强度进行了观察分析与测定。通过图像分析与处理技术，提取了PS45涂层与基体结合界面形貌图像和曲线。利用Matlab语言设计了涂层界面的分形维数和多重分形谱宽的计算程序，探讨了分形维数、多重分形谱、喷涂电压对涂层结合强度的影响。分析计算结果表明：涂层结合界面形貌越复杂，分形维数越大，涂层与基体的结合强度越高：喷涂电压升高，粒子熔化越充分，其涂层界面多重分形谱宽△a越小，涂层与基体结合界面均匀性越好。

Study of the Bond Strength of PS45 Alloy Coatings Prepared by High Velocity Arc Spray and Processing Parameters on Fractal Theory

In the paper, the microstructure of PS45 coatings prepared by high velocity electric wire arc spraying was investigated by scanning electron microscope. Bonding strength was tested by electron tensile testing machine. The interface morphology of PS45 coatings was acquired by means of picture analysis and processing technology, the computing programs of fractal dimensions and multifractal spectrum were designed in Matlab language. The relations of the bonding strength to spray voltage and fractal dimension and multifractal spectrum were discussed. The results of analysis and calculation show that the better the bonding strength of PS45 coatings is, the more complicated the interface morphology and bigger fractal dimensions are. With spray voltage gone up, the better the interface uniformity is, the smaller the spectrum width is.