| Microstructural evolution during direct laser sintering of multi-component Cu-based metal powder |
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| 作者姓名： | 沈以赴 顾冬冬 吴鹏 杨家林 王洋 |
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| 作者单位： | [1]College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China [2]Institute of Machinery Manufacturing Technology, China Academy of Engineering Physics, Mianyang 621900, China |
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| 基金项目： | 国家自然科学基金，中国航空科学基金，南京航空航天大学校科研和教改项目，China Academy of Engineering Physics |
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| 摘 要： | A multi-component Cu-based metal powder was chosen for direct laser sintering. The powder consists of a mixture of high-purity Cu powder, pre-alloyed CuSn and CuP powder. Liquid phase sintering with complete melting of the binder （CuSn） but non-melting of the cores of structural metal （Cu） proves to be a feasible mechanism for laser sintering of this powder system. The microstructural evolution of the sintered powder with variation of laser processing parameters was presented. High sintering activities and sound densification response were obtained by optimizing the laser powers and scan speeds. Using a high laser power accompanied by a high scan speed gives rise to baUing effect. At a high laser power with a slow scan speed the sintering mechanism may change into complete melting/solidification, which decreases the obtainable sintered density. The role of additive phosphorus in the laser sintering process is addressed. Phosphorus can act as a fluxing agent and has a preferential reaction with oxygen to form phosphatic slag, protecting the Cu particles from oxidation. The phosphatic slag shows a concentration along grain boundaries due to its light mass as well as the short thermal cycle of SLS.
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| 关 键 词： | 显微结构 铜基金属粉末 激光烧结 液相烧结 |
| 文章编号： | 1003-6326（2005）06-1309-06 |
| 收稿时间： | 2005-05-08 |
| 修稿时间： | 2005-09-12 |
Microstructural evolution during direct laser sintering of multi-component Cu-based metal powder |
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| SHEN Yi-fu,GU Dong-dong,WU Peng,YANG Jia-lin,WANG Yang.Microstructural evolution during direct laser sintering of multi-component Cu-based metal powder[J].Transactions of Nonferrous Metals Society of China,2005,15(6):1309-1314. |
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| Authors: | SHEN Yi-fu GU Dong-dong WU Peng YANG Jia-lin WANG Yang |
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| Abstract: | A multi-component Cu-based metal powder was chosen for direct laser sintering. The powder consists of a mixture of high-purity Cu powder, pre-alloyed CuSn and CuP powder. Liquid phase sintering with complete melting of the binder (CuSn) but non-melting of the cores of structural metal (Cu) proves to be a feasible mechanism for laser sintering of this powder system. The microstructural evolution of the sintered powder with variation of laser processing parameters was presented. High sintering activities and sound densification response were obtained by optimizing the laser powers and scan speeds. Using a high laser power accompanied by a high scan speed gives rise to balling effect. At a high laser power with a slow scan speed the sintering mechanism may change into complete melting/solidification, which decreases the obtainable sintered density. The role of additive phosphorus in the laser sintering process is addressed. Phosphorus can act as a fluxing agent and has a preferential reaction with oxygen to form phosphatic slag, protecting the Cu particles from oxidation. The phosphatic slag shows a concentration along grain boundaries due to its light mass as well as the short thermal cycle of SLS. |
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| Keywords: | direct metal laser sintering Cu-based metal powder liquid phase sintering microstructure |
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