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| Effect of raw material preparation methods on properties of Ni moulded parts by selective laser melting |
| TANG Zi-lei |
| Sichuan Vocational and Technical College of Architecture, Deyang 618000, China |
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Abstract Ni powder prepared by spray drying and gas atomization were used as printing materials, respectively. Ni melting moulded parts were prepared by selective laser melting (SLM) technology, and their transverse and longitudinal microstructure characteristics were observed. The results show that the two kinds of Ni powder particles prepared by spray drying and gas atomization both have good sphericity. Most of the powder particles are smaller than 50 μm, and the sphericity is above 0.8. Both of them have very pure phase structure with Ni phase only. A melt channel with a width of about 85 μm is formed in the moulded part prepared by spray drying Ni powder, while a melt channel with a width of 75 μm is formed in the moulded part prepared by gas atomized Ni powder. There are many defects and some irregular holes in moulded parts prepared by gas atomized Ni powder. There are many oval molten pools in overlapping state on the longitudinal surface of the sample, and the sample prepared by spray drying Ni powder has a deeper molten pool depth than that prepared by gas atomized Ni powder sample.
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Received: 17 December 2018
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2019, Vol. 29 
