Selective laser melting of metal structures onto graphite substrates via a low melting point interlayer alloy
Selective laser melting of metal structures onto graphite substrates via a low melting point interlayer alloy
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DOI：
10.1016/j.apmt.2021.101334
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发表时间：
2022-01-12
影响因子：
8.3
通讯作者：
Schiffres, Scott N.
中科院分区：
文献类型：
--
作者：
Azizi, Arad;Chen, Xiaobo;Schiffres, Scott N.
我们演示了一种直接在石墨上选择性激光熔化金属合金的工艺。金属特征印在退火热解石墨上的传热应用是引人注目的，因为热解石墨在任何块状材料中具有第二高的面内导热系数（室温下> 1500 W/m-K）。选择性激光熔化（SLM）中常用的金属合金与石墨的结合相对较弱，适当的层间材料可显著改善润湿和结合。挑战在于，通常与石墨结合的合金需要在高温下延长结合时间（几分钟到几小时），而SLM工艺只能在高温下短暂暴露（类似于100 μ s）。在本文中，我们使用了一种Sn3Ag4Ti合金，通过透射电镜验证，该合金可以快速形成纳米薄的TiC层。通过力学测试和激光选择性熔化模拟，揭示了石墨热性能对界面结合强度的影响。(c) 2021 Elsevier Ltd.版权所有。
We demonstrate a process to selective laser melt a metal alloy directly onto graphite. The heat transfer applications of metal features printed onto annealed pyrolytic graphite are compelling, as pyrolytic graphite has the second highest in-plane thermal conductivity (> 1500 W/m-K at room temperature) of any bulk material. While the bonding of metal alloys commonly used in selective laser melting (SLM) with graphite is relatively weak, the proper interlayer material drastically improves the wetting and bonding. The challenge is the alloys that typically bond to graphite require extended bonding times at elevated temperatures (minutes to hours), while the SLM process delivers only brief exposures to high temperatures (similar to 100 mu s). In this paper, we employ a Sn3Ag4Ti alloy that rapidly forms a nanometer-thin layer of TiC, as verified by transmission electron microscopy. The influence of graphite thermal properties on interfacial bond strength is shown by mechanical testing and simulations of selective laser melting. (c) 2021 Elsevier Ltd. All rights reserved.