特殊粒径分布球形Ni粉的制备及SLM工艺性能研究

doi:10.11896/cldb.19040058

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Abstract Based on the technical characteristics of selective laser melting (SLM), a novel method combining low temperature spray-drying with heat treatment was developed, and two kinds of Ni powders with single-peak and bimodal distribution of particle size, high purity, good sphericity, high flowability were prepared. It is found that the Ni powder with bimodal particle size distribution has higher specific surface area and apparent density, leading to absorb more laser energy and higher thermal conductivity. As a result, wider melting channels were formed in the printing process and the spheroidization phenomenon was eliminated. However, a small amount of spheroidization particles and micro cracks occurred on the surface of the printed bulk material prepared by the Ni powder with single-peak distribution of particle size, exhibiting decreased hardness and modulus with the increasing indentation depth and poor mechanical properties. The relative density is achieved as 99.8% at the printed bulk material prepared by the Ni powder with bimodal distribution of particle size and the hardness and modulus tend to be a stable value with increasing indentation depth. In addition, its plasticity increased by 30% than that of the printed bulk material prepared by the Ni powder with single-peak distribution of particle size.

Key words： selective laser melting bimodal particle size distribution apparent density thermal conductivity

Published: 12 March 2020

CLC number:

TG123

Fund:This work was financially supported by the National Natural Science Fund for innovative research groups (51621003).

About author:: Yajuan Zhangis currently a doctoral student at the College of Materials Science and Engineering, Beijing University of Technology. Her research interest is metal powder metallurgy; Xiaoyan Songworks at College of Materials Science and Engineering and the Key Laboratory of Advanced Functional Materials of Education Ministry, Beijing University of Technology. She is Yangtze River Scholars Distinguished Professor, and winner of China National Science Fund for Distinguished Young Scholars. Based on computational materials science, her group aims at design, preparation, and investigation of microstructures and properties of metallic nanomaterials, including rare-earth materials, hard metals and cermets.

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	ZHANG Yajuan
	LI Yanan
	SONG Xiaoyan
	WANG Haibin
	HOU Chao
	NIE Zuoren

Cite this article:

ZHANG Yajuan,LI Yanan,SONG Xiaoyan, et al. Preparation and Performance of Spherical Ni Powder with Special Particle Size Distribution for SLM Processing[J]. Materials Reports, 2020, 34(6): 6114-6119.

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http://www.mater-rep.com/EN/10.11896/cldb.19040058 OR http://www.mater-rep.com/EN/Y2020/V34/I6/6114

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