以钼丝为实验喷涂材料,采用电爆炸定向喷涂的方法,在内径为7 mm的聚乙烯爆炸管内进行爆炸喷涂实验,用扫描电镜观察涂层的表面和截面形貌,分析涂层与基体的结合情况.结果表明:爆炸管内钼丝的爆炸产物在基体上会形成一个喷涂圆面,其由中心涂层区和外围黏结层组成.中心涂层区在喷涂距离小于8 mm时,所得涂层致密,与基体结合良好,界面附近存在元素扩散现象；在该喷涂距离下,进行多个喷涂圆面的搭接实验分析,发现单个喷涂圆面之间具有自清理作用.大面积喷涂层可由单个喷涂圆面的合理搭接来形成,通过多次喷涂可增加涂层的厚度.%Mo wire was chosen as testing material for spray coating and an explosion test for directional spray coating was carried out in a polyethylene capillary explosion tube with 7 mm inner diameter. The morphology of coating surface and cross-section was observed with electronic-scanner and the bonding between coating and substrate was analyzed. The result showed that the explosion product of Mo wire in a constrained capillary tube would form a spraying spot, which would consist of central coating and outer adhesive layer. When the spraying distance was smaller than 8 mm, the central coating would be compact, bonding between coating and substrate was good, the element diffusion occurred in the interface between them. Within the zone of spraying distance, experiment of overlapping of several spots was conducted and them analyzed. It was found that these spots exhibited self-cleaning function. Large coating could be formed by reasonable overlapping of single spraying spots, and thick coating could be obtained by spraying.
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