期刊
ADDITIVE MANUFACTURING
卷 10, 期 -, 页码 10-14出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.addma.2016.01.003
关键词
Selective laser melting; Aluminium alloys; Surface structure; Surface modification; X-ray photoelectron spectroscopy (XPS)
资金
- Australian Research Council (ARC) [DP0986067, DP130103592, LE110100094]
- Australian Research Council LIEF [LE120100026]
- University, State and Commonwealth Governments
- Australian Research Council [DP0986067, LE110100094] Funding Source: Australian Research Council
Unlike conventional powder metallurgy techniques, selective laser melting (SLM) is characterised by its fully melting process and very high heating and cooling rates and little has been known about the influence of powder surface state on the SLM process. In this study, the influence of low temperature powder drying on the surface chemistry of Al-12Si powder and its subsequent effect on SLM was investigated in detail by means of an in-depth X-ray photoelectron spectroscopy. An enhanced densification (relative density >= 99%) was achieved in the dried Al-12Si powder compared to the as-received powder. This has been attributed to the modification of powder surface by removing a moisture skin during the drying process, which prevents the formation of deleterious oxide and hydroxide during SLM. This study provides important information for achieving high relative density in SLM fabricated metal components from a powder drying aspect. (C) 2016 Elsevier B.V. All rights reserved.
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