针对气雾化制备激光熔覆专用粉末的问题,调整粉末材料配比,采用改进后的超音速气雾化喷嘴,对比原喷嘴进行气雾化制取激光熔覆专用镍基合金粉末的实验.结果表明,喷嘴是影响雾化粉末的重要因素.随着喷嘴结构的改进,粉末的平均粒度dm越小、体积四次矩平均径dvm和Sauter平均直径dvs越小,即颗粒越细.与此同时,粉末的流动性更好,松装比更大,粉末的有效雾化率高,符合激光熔覆的要求.
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