喷嘴结构对气雾化激光熔覆专用合金粉末的影响  

Effects of Structure of Nozzle on Gas Atomization for Laser Cladding Alloy Powders

作　　者：郭士锐[1,2] 姚建华[1,2] 陈智君[1,2] 楼程华[1,2] 吴涵锋[1,2] 

机构地区：[1]浙江工业大学特种装备制造与先进加工技术教育部重点实验室,杭州310014 [2]浙江工业大学激光加工技术工程研究中心,杭州310014

出　　处：《材料工程》2013年第7期50-53,60,共5页Journal of Materials Engineering

基　　金：国家国际科技合作项目(2011DFR1030);浙江省公益技术应用研究国际科技合作项目(2011C24006)

摘　　要：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。Focus on the question of producing specific powers for laser cladding by gas atomization, adjusted the ratio of powder material, compared to the original nozzle, the atomization experiments were carried on to produce nickel-based powder of laser cladding by improved supersonic nozzle. The results show that the gas-atomizing nozzle is an important factor in the process of gas atomization. With the improvement of structure of nozzle, the particle mean diameters, volume mean diameters and Sauter mean diameters decrease. In other words, the particle size decreases. Meanwhile, the powders have better fluidity, larger apparent density and efficient atomization efficiency, which meet the require- ments of laser cladding.

关 键 词：激光熔覆 气雾化 镍基粉末 喷嘴 粒径 

分 类 号：TG156.990[金属学及工艺—热处理] TF801.3[金属学及工艺—金属学]