Dense Pure Tungsten Fabricated by Selective Laser Melting

作者：Wang, Dianzheng; Yu, Chenfan; Zhou, Xin; Ma, Jing; Liu, Wei^*; Shen, Zhijian^*

来源：Applied Sciences-Basel, 2017, 7(4): 430.

DOI：10.3390/app7040430

• selective laser melting
• pure tungsten
• spherical powders
• laser absorptivity
• packing density
• densification

Additive manufacturing using tungsten, a brittle material, is difficult because of its high melting point, thermal conductivity, and oxidation tendency. In this study, pure tungsten parts with densities of up to 18.53 g/cm(3) (i.e., 96.0% of the theoretical density) were fabricated by selective laser melting. In order to minimize balling effects, the raw polyhedral tungsten powders underwent a spheroidization process before laser consolidation. Compared with polyhedral powders, the spherical powders showed increased laser absorptivity and packing density, which helped in the formation of a continuous molten track and promoted densification.

• 出版日期2017-4
• 单位清华大学