Abstract：The particle size and shape characteristics of 3D printed spherical metal powder have a great influence on the properties of formed parts. Therefore, it is very important to explore appropriate particle size and shape parameters to control the quality of 3D printing spherical metal powder. Mixing the coarse and fine particle size of 3D printing metal powder in a certain proportion can effectively improve the product strength and quality on the surface. In fact, the traditional laser diffraction method is difficult to distinguish the multi particle groups of powder samples, while the image particle sizing analysis an easy solution. The sphericity and satellitized degree of 3D printing powder are the focus of particle shape research, but the sphericity is actually distinguished by three corresponding levels of shape including macroshape, mesoshape and microshape, which isdifficultto be completely characterized by a certain parameter. In this paper, the instrument (Occhio 500nano XY) and method of measuring particle size by imaging method are proposed for 3D printing spherical metal powder, and compared with the traditional laser diffraction method. It is proposed that Bluntness and Outgrowth index, two unique quantitative microshape parameters are the most suitable evaluation parameters for the sphericity of 3D printing metal powder which were described the meaning and indicated the discrimination. It is proved that Bluntness is one of the most sensitive sphericity characterization parameters, and Outgrowth index can reflect the satellitized degree of spherical particles quantitatively. However, the circularity recommended by
刘文莉, 杨正红, 王莘泉. 粒度粒形分析技术用于3D打印球形金属粉末的球形度和卫星化测定——兼议GB/T 39251—2020[J]. 粉末冶金材料科学与工程, 2022, 27(5): 559-568.
LIU Wenli, YANG Zhenghong, WANG Xinquan. Measurement of the sphericity and satellity of 3D printing metal powder by imaging particle size analysis——with argument on GB/T39251—2020. Materials Science and Engineering of Powder Metallurgy, 2022, 27(5): 559-568.
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