Preparation and characterization of Cu6AlNiSnInCe imitation-gold powder by vacuum nitrogen gas atomization for 3D printing
CUI Bo1, ZHU Quanli1, CHEN Jin2, MAO Weidong3, Li Bo4, XIAO Zhiyu1
1. National Engineering Research of Net-Sharp Forming for Metallic Material, South China University of Technology, Guangzhou 510640, China; 2. Guangzhou Nalian Materials Technology Co. Ltd, Guangzhou 510447, China; 3. Foshan Suizhibo New Materials Technology Co. Ltd, Foshan 528247, China; 4. Foshan Nanhai Zhongnan Machinery Co. Ltd, Foshan 528247, China
Abstract A novel Cu6AlNiSnInCe imitation-gold powder for 3D printing was fabricated by vacuum gas atomization. And its color, morphology, particle size distribution and microstructure were characterized by using spectrophotometer, scanning electron microscopy (SEM), laser particle size analyzer, laser particle shape analyzer and DTA. The formability of specimens was also studied in selective laser melting (SLM). The results show that the color difference ΔE between Cu6AlNiSnInCe powder and pure gold is 28.9; the 80% (volume fraction) of the powder roundness fitting rate up to 85%, the 60% of the powder bluntness fitting rate up to 70%, and the shape of the powder particles are spherical or nearly spherical, the fluidity of powder is 16 s/50 g, apparent density is 4.39 g/cm3, tap-density is 4.67 g/cm3, average oxygen content is 0.01%. The yield of powder with particle size between 15 and 53 μm is 40%. The microstructure of the powders is composed of cellular and dendritic grains, which is a matrix of α-Cu solid solution and a Sn-rich phase distributed along grain boundaries. The relative density of Cu6AlNiSnInCe alloy formed by Selective laser melting (SLM)increases with increasing laser power or decreasing laser scanning speed, and the maximum relative density reaches 89.6%。
CUI Bo,ZHU Quanli,CHEN Jin, et al. Preparation and characterization of Cu6AlNiSnInCe imitation-gold powder by vacuum nitrogen gas atomization for 3D printing[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(1): 1-7.
2019, Vol. 24 
