【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。更多还原

【Abstract】 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 requirements of laser cladding.更多还原