Characterization of nanoparticle mixed 316L powder for additive manufacturing

作     者：Wengang Zhai Wei Zhou Sharon Mui Ling Nai Jun Wei Wengang Zhai;Wei Zhou;Sharon Mui Ling Nai;Jun Wei

作者机构：School of Mechanical and Aerospace EngineeringNanyang Technological University50 Nanyang Avenue639798Singapore Singapore Institute of Manufacturing Technology73 Nanyang Drive637662Singapore 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2020年第47卷第12期

页      面：162-168页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by A*STAR Industrial Additive Manufacturing Program:The A*STAR Additive Manufacturing Centre(AMC)Initiative:Work Package 1(High Temperature Mate-rials Development for 3D Additive Manufacturing,Grant No.1426800088) financial support from Nanyang Technological University。 

主　　题：Powder mixing Powder characterization Flowability Apparent density Tap density Additive manufacturing 

摘      要：Nanoparticles reinforced steels have many advantaged mechanical properties.Additive manufacturing offers a new method for fabricating nanoparticles reinforced high performance metal components.In this work,we report the application of low energy ball milling in mixing nanoparticles and micron 316 L powder.With this method,0.3 and 1.0 wt% Y2 O3 nanoparticles can be uniformly distributed on the surface of 316 L powder with the parameters of ball-to-powder ratio at 1:1,speed at 90 rpm and 7 h of mixing.The matrix 316 L powders remain spherical in shape after the mixing process.In the meantime,the effect of low energy ball milling and the addition of Y2 O3 nanoparticles on the powder characteristics(flowability,apparent density and tap density) are also studied.Results show that the process of low energy ball milling itself can slightly decrease the flowability and apparent density of the 316 L powder.The addition of 0.3 and 1.0 wt% Y2 O3 nanoparticles can also decrease the flowability,the tap density and the apparent density compared with the original 316 L powder.All of these changes result from the rough surface of the mixed powder produced by ball milling and the addition of Y2 O3 nanoparticles.The powder’s rough surface can increase the coefficient of friction of powders.The mixture of 316 L powder and Y2 O3 nanoparticles can be successfully used for selective laser melting(SLM).The relative density of SLM 316 L-Y2 O3 is measured at 99.5%.However,Y2 O3 agglomerations were observed which is due to the poor wettability between 316 L and Y2 O3.