Preparation and Performance of Spherical Ni Powder with Special Particle Size Distribution for SLM Processing
ZHANG Yajuan, LI Yanan, SONG Xiaoyan, WANG Haibin, HOU Chao, NIE Zuoren
Key Laboratory of Advanced Functional Materials, Education Ministry of China, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
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.
张亚娟, 李亚楠, 宋晓艳, 王海滨, 侯超, 聂祚仁. 特殊粒径分布球形Ni粉的制备及SLM工艺性能研究[J]. 材料导报, 2020, 34(6): 6114-6119.
ZHANG Yajuan, LI Yanan, SONG Xiaoyan, WANG Haibin, HOU Chao, NIE Zuoren. Preparation and Performance of Spherical Ni Powder with Special Particle Size Distribution for SLM Processing. Materials Reports, 2020, 34(6): 6114-6119.
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