摘要
采用高速离心雾化工艺制备3D打印用纯Ag粉,系统研究了粉末飞行距离和粒径分布、显微组织、元素分布之间的关系,并采用选区激光熔化工艺制备纯Ag块体试样.结果表明,60 000 r/min下离心雾化制备Ag粉末粒径在3.8～101.2 μm内波动,随着粉末飞行距离增加,粉末D50逐渐增大.另外,制备过程中粉末未发生元素污染,粉末整体球形度良好,无卫星粉或空心粉存在,显微组织为全胞晶结构.制备的Ag块体试样显微组织由等轴晶粒组成,平均晶粒尺寸为0.14 µm.
Abstract
Pure Ag powders for 3D printing were prepared by high-speed centrifugal atomization process,and blocky Ag specimens were fabricated by selective laser melting.The relationship between flight distance with particle size dis-tribution,microstructure and element distribution was systematically investigated.The results indicate that the particle size of Ag powders prepared at 60 000 r/min fluctuates within the range of 3.8 μm to 101.2 μm.D50 powders are increased with the flight distance increase,and element contamination is hardly observed.The overall sphericity of powder is desirable without satellite powder or hollow powder,and the microstructure presents cell crystal.The blocky Ag specimen is composed of equiaxed grains with an average size of 0.14 μm.
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