Selective laser melting of Al-12Si alloy: Enhanced densification via powder drying
Selective laser melting of Al-12Si alloy: Enhanced densification via powder drying
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DOI：
10.1016/j.addma.2016.01.003
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发表时间：
2016-04-01
影响因子：
11
通讯作者：
Sercombe, T. B.
中科院分区：
文献类型：
--
作者：
Li, X. P.;O'Donnell, K. M.;Sercombe, T. B.
与传统的粉末冶金技术不同，选择性激光熔化（SLM）的特征在于其完全熔化过程和非常高的加热和冷却速率，并且对粉末表面状态对SLM过程的影响知之甚少。在这项研究中，低温粉末干燥对Al-12 Si粉末的表面化学的影响及其随后对SLM的影响进行了详细的研究，通过深入的X射线光电子能谱。与原始粉末相比，在干燥的Al-12 Si粉末中实现了增强的致密化（相对密度>= 99%）。这归因于在干燥过程中通过去除水分皮来对粉末表面进行改性，这防止了在SLM过程中形成有害的氧化物和氢氧化物。本研究从粉末干燥的角度为SLM制造的金属构件实现高相对密度提供了重要信息。(C)© 2016 Elsevier B. V.版权所有。
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.