Development of Micro Selective Laser Melting:The State of the Art and Future Perspectives  

微观选择性激光熔化技术发展的现状及未来展望

作　　者：Balasubramanian Nagarajan Zhiheng Hu Xu Song Wei Zhai Jun Wei 

机构地区：[1]Singapore Institute of Manufacturing Technology(SIMTech),Agency for Science,Technology and Research(A^*STAR),Singapore 637662,Singapore

出　　处：《Engineering》2019年第4期702-720,共19页工程（英文）

基　　金：financial support from the Science and Engineering Research Council,Agency for Science,Technology and Research(A*STAR),Singapore(142 68 00088)

摘　　要：Additive manufacturing(AM)is gaining traction in the manufacturing industry for the fabrication of components with complex geometries using a variety of materials.Selective laser melting(SLM)is a common AM technique that is based on powder-bed fusion(PBF)to process metals;however,it is currently focused only on the fabrication of macroscale and mesoscale components.This paper reviews the state of the art of the SLM of metallic materials at the microscale level.In comparison with the direct writing techniques that are commonly used for micro AM,micro SLM is attractive due to a number of factors,including a faster cycle time,process simplicity,and material versatility.A comprehensive evaluation of various research works and commercial systems for the fabrication of microscale parts using SLM and selective laser sintering(SLS)is conducted.In addition to identifying existing issues with SLM at the microscale,which include powder recoating,laser optics,and powder particle size,this paper details potential future directions.A detailed review of existing recoating methods in powder-bed techniques is conducted,along with a description of emerging efforts to implement dry powder dispensing methods in the AM domain.A number of secondary finishing techniques for AM components are reviewed,with a focus on implementation for microscale features and integration with micro SLM systems.Additive manufacturing(AM) is gaining traction in the manufacturing industry for the fabrication of components with complex geometries using a variety of materials. Selective laser melting(SLM) is a common AM technique that is based on powder-bed fusion(PBF) to process metals; however, it is currently focused only on the fabrication of macroscale and mesoscale components. This paper reviews the state of the art of the SLM of metallic materials at the microscale level. In comparison with the direct writing techniques that are commonly used for micro AM, micro SLM is attractive due to a number of factors,including a faster cycle time, process simplicity, and material versatility. A comprehensive evaluation of various research works and commercial systems for the fabrication of microscale parts using SLM and selective laser sintering(SLS) is conducted. In addition to identifying existing issues with SLM at the microscale, which include powder recoating, laser optics, and powder particle size, this paper details potential future directions. A detailed review of existing recoating methods in powder-bed techniques is conducted, along with a description of emerging efforts to implement dry powder dispensing methods in the AM domain. A number of secondary finishing techniques for AM components are reviewed, with a focus on implementation for microscale features and integration with micro SLM systems.

关 键 词：ADDITIVE manufacturing SELECTIVE laser MELTING MICROFABRICATION Hybrid processing Powder-bed RECOATING 

分 类 号：TG6[金属学及工艺—金属切削加工及机床]