紧耦合气雾化技术制备选区激光熔化用18Ni300合金粉末的研究

Research on 18Ni300 alloy powders prepared by close-coupled gas atomization technology used for selective laser melting

基于紧耦合气雾化技术制备符合选区激光熔化用18Ni300合金粉末,重点研究了雾化压力对粉末粒度(中值粒径,D50)、粒度分布、球形度、氧含量、流动性和松装密度等特性的影响。结果表明:雾化压力对上述粉末特性影响显著,当雾化压力在3.5 MPa到4.5 MPa范围时,随着压力的提高,粉末粒度降低、表面形貌改善、流动性变好、松装密度增加。当雾化压力为4.5 MPa时,所制备的粉末综合特性最优,粉末粒度(D50)为34μm,球形度为0.77,氧含量为0.02%(质量分数),流动性为17.4[s·(50 g)^-1],松装密度为4.32 g·cm^-3,15~53μm粒径范围粉末收得率为38.1%,满足选区激光熔化技术对金属粉末性能的要求。

The 18 Ni300 alloy powders used for selective laser melting were prepared by close-coupled gas atomization,the effects of gas pressure on the particle size(median particle diameter,D50),particle size distribution,particle shape,oxygen content by mass,flowability,and apparent density of 18 Ni300 alloy powders were investigated in this paper.The results show that,the gas pressure has the significant effect on these characteristics.With the increase of gas pressure from 3.5 MPa to 4.5 MPa,the particle size decreases,the surface morphology improves,the flowability gets better,and the apparent density increases.When the gas pressure is 4.5 MPa,the 18 Ni300 alloy powders show the optimal comprehensive characteristics,the particle size(D50)is 34μm,the sphericity is 0.77,the oxygen content by mass is 0.02%,the flowability is 17.4[s·(50 g)^-1],the apparent density is 4.32 g·cm^-3,and the powder yield in the size of 15~53μm is 38.1%,meeting the requirements of selective laser melting for the metal powders.