摘要
针对现有功能梯度材料制备技术存在低黏度液体难以精准控形、层间结合强度差、成形结构单一等方面的不足和局限性,提出了一种基于多材料3D打印和约束牺牲层连续功能梯度材料-结构一体化制造新工艺,实现了聚合物基连续功能梯度材料的全新制备。通过理论分析和实验研究,揭示了挤出速度、打印速度、线间距等主要工艺参数对打印连续功能梯度材料质量和性能的影响规律。利用自主搭建的实验装置制备的石墨烯/光敏树脂介电功能梯度材料(d-FGM),实现了聚合物基连续功能梯度绝缘子的一体化制造,与均质光敏树脂相比,介电常数增加了1倍,电阻率降低了93.3%,沿面电场强度提升幅值超过了14%。Al_(2)O_(3)/聚二甲基硅氧烷(Al_(2)O_(3)/PDMS)连续变刚度功能梯度材料,相较于单一PDMS材料,质量分数为40wt%的Al_(2)O_(3)一侧刚度增加了1倍,实现了Al_(2)O_(3)粉末的连续梯度分布。该3D打印工艺为聚合物基连续功能梯度材料的制备提供了一种低成本、高效率的解决方案。
An integrated manufacturing of continuous functionally graded materials-structures based on multi-material 3D printing and constrained sacrificial layer was proposed to solve the limitations of the existing functionally graded material preparation methods,such as difficult to control the shape of low-viscosity liquids accurately,poor interlayer bonding strength,and simple forming structure.This technology is capable of realizing the brand-new preparation of polymer-based continuous functionally graded materials.Through theoretical analysis and experimental investigation,the influence law of main process parameters including extrusion speed,printing speed and line spacing,on the forming quality and performance of printing continuous functionally graded materials are revealed.Graphene/UV curable resin dielectric functionally graded material(d-FGM)were prepared by using lab selfdeveloped device,and realizing the integrated manufacturing of polymer-based continuous functionally graded insulators.Compared with the homogeneous UV curable resin,the dielectric constant has doubled,the resistivity has been reduced by 93.3%,and the amplitude of the creeping electric field strength has increased by more than 14%.Besides,the rigidity of the Al_(2)O_(3)side with 40%content has doubled than a single polydimethylsiloxane(PDMS)material.With the features of realizing the continuous gradient distribution of the Al_(2)O_(3).The 3D printing process provides a low-cost and high-efficiency solution for the preparation of polymer-based continuous functionally graded materials.
作者
齐田宇
杨建军
赵佳伟
宋银宝
郭鹏飞
张冠军
兰红波
QI Tianyu;YANG Jianjun;ZHAO Jiawei;SONG Yinbao;GUO Pengfei;ZHANG Guanjun;LAN Hongbo(Shandong Engineering Research Center for Additive Manufacturing,Qingdao University of Technology,Qingdao 266520,China;State Key Laboratory for Manufacturing Systems Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2022年第3期1055-1067,共13页
Acta Materiae Compositae Sinica
基金
山东省自然科学基金重大基础研究项目(ZR2020ZD04)
山东省重点研发计划(2019GGX104060)
国家自然科学基金(51775288)。
关键词
功能梯度材料
增材制造
约束牺牲层
3D打印
功能梯度绝缘子
光敏树脂
functionally graded material
additive manufacturing
constrained sacrificial layer
3D printing
dielectric functionally graded insulator
UV curable resin
