聚合物选区激光烧结粉末熔合介观模拟  

Mesoscopic simulation of powder fusion in polymer selective laser sintering

作　　者：蔡令令 丁浩亮[2] 孟娟 温馨 严波[1] CAI Lingling;DING Haoliang;MENG Juan;WEN Xin;YAN Bo

机构地区：[1]上海交通大学材料科学与工程学院,上海200030 [2]航天材料及工艺研究所,北京100076

出　　处：《模具技术》2021年第6期36-42,共7页Die and Mould Technology

基　　金：国家重点研发计划(2018YFB1106700);国家自然科学基金(51005151)。

摘　　要：根据聚合物选区激光烧结中的熔体流动模型,采用HCZ-LBM(He-Chen-Zhang lattice Boltzmann method)法模拟了烧结过程中的粉末熔化、气体溢出过程,得到内部孔隙演化过程。模拟研究了在表面张力的作用下,不同黏度、不同粉末厚度、有无重力对熔合形态、孔隙形态(分布、尺寸、孔隙率)的影响。随着熔体黏度的增大,熔合过程变慢,内部孔隙个数增多,孔隙尺寸减小;随着粉末厚度的增加,内部孔隙个数和孔隙率都有增加;与无重力相比,重力的存在会促进内部气体的溢出。According to the flow model of molten polymer during selective laser sintering,HCZ-LBM(He-Chen-Zhang lattice Boltzmann method)method was used to simulate the sintering process of molten powder flow and gas overflow,thus the evolution of interior pores.Considering the surface tension,simulations were conducted to study the effects of the viscosity,powder thickness and gravity to the fusion and pore morphology(distribution,size,porosity).With the increase of viscosity,the melting powders were fused more slowly and the number of internal pores increases,and the pore size decreases.With the increase of powder thickness,the number and porosity of internal pores increase.Compared with the absence of gravity,the presence of gravity will promote the escape of gas inside.

关 键 词：选区激光烧结 格子波尔兹曼方法 熔池 孔隙形态 数值模拟 

分 类 号：TQ320.6[化学工程—合成树脂塑料工业]