基于热处理的选区激光烧结PA12力学性能调控研究(特邀)  

Research on the Control of Mechanical Properties of Selective Laser Sintering PA12 Based on Heat Treatment(Invited)

作　　者：韩壮 李猛 曾勇[1] 陈继民[1] 刘秀斌 HAN Zhuang;LI Meng;ZENG Yong;CHEN Jimin;LIU Xiubin(Faculty of Physics and Optoelectronic Engineering,Beijing University of Technology,Beijing 100124,China;China Astronaut Research and Training Center,Beijing 100094,China;National Key Laboratory of Human Factors Engineering,Beijing 100094,China)

机构地区：[1]北京工业大学物理与光电工程学院,北京100124 [2]中国航天员科研训练中心,北京100094 [3]人因工程全国重点实验室,北京100094

出　　处：《光子学报》2024年第10期51-63,共13页Acta Photonica Sinica

基　　金：人因工程重点实验室基金(No.HFNKL2023WW09)。

摘　　要：为解决选区激光烧结技术在聚酰胺12(PA12)材料成形时机械性能较差的问题,自主研制了一种均热-速冷装置。旨在通过改善材料内部的组织缺陷,使其达到材料本征机械性能。经过热处理后的样品常温下性能得到了极大改善,其最大拉伸强度为(57.6±1.9)MPa,断裂伸长率介于293%至297%之间。此外,该材料在高、低温环境中依然保持了良好的拉伸性能,在-80℃时的拉伸强度最高达110.5 MPa,断裂伸长率为22%至25%;+80℃时的拉伸强度则为(53.1±3.3)MPa,断裂伸长率最高达578.6%。经过热处理的具有三周期极小曲面结构样品,在弹性阶段的承载能力均有所提升,增幅最高达19%。其中,热处理后的D型TPMS表现出色,其弹性阶段的最大承载力达7.3 kN,且具有出色的能量吸收性能。Additive manufacturing plays an indispensable role in the field of complex structure forming,which enables the precise manufacturing of complex products directly through digital models.Among them,Selective Laser Sintering(SLS)technology,as an advanced technology for powder-based additive manufacturing,PA12 is an ideal material that can be used in SLS technology.However,during the forming process,the particles are connected by sinter necks,which often results in microporous parts and high surface roughness,which prevents the intrinsic properties of the material from being achieved.In order to improve the mechanical properties of SLS molded parts,three methods are usually applied:first,the process parameters are optimized,which is a relatively simple method,but usually the material properties are not greatly improved;the second is to enhance the performance of the part by introducing reinforcement,which can indeed bring about the improvement of the performance of the molded parts,but it is usually difficult to form,and at the same time will cause many problems such as the surface quality of the molded parts;finally,this situation is improved by post-treatment of the formed parts,which is also a good way to improve the mechanical properties of the molded parts,which are commonly improved by heat treatment,but this method often leads to the deformation of the parts after heat treatment,which is usually caused by overheating and slow cooling.In order to solve this problem,this paper independently developed a uniform heating and rapid cooling device for heat treatment of SLS-printed PA12 materials and complex structural parts.It aims to achieve the intrinsic mechanical properties of the material by improving the internal structural defects of the material.The properties of the heat-treated sample were greatly improved at room temperature,with a maximum tensile strength of(57.6±1.9)MPa and an elongation at break between 293%and 297%.In addition,the material still maintains good tensile properties in high and low temper

关 键 词：增材制造 PA12 三周期极小曲面 热处理 力学性能 

分 类 号：TP391.7[自动化与计算机技术—计算机应用技术] TB324[自动化与计算机技术—计算机科学与技术]