摘要
聚醚醚酮(Polyetheretherketone,PEEK)具有极高的耐热性与优良的机械性能,适合用于航空高温环境。而利用增材制造(Additive manufacturing,AM)制备轻质点阵结构,可替代常规的实体结构,实现航空零部件的轻量化。为此,制备了PEEK/Ta/Nb复合粉末材料,通过高温激光选区烧结(High temperature–selective laser sintering,HT–SLS)增材制造技术成形PEEK/Ta/Nb三周期极小曲面Gyroid梯度点阵结构,研究了复合材料点阵结构的压缩性能并阐明了结构断裂机制。研究表明,Gyroid梯度点阵结构在单元连接处虽然可以平滑过渡,但应力最先在孔隙率较大的斜杆处产生集中,达到临界值时逐层坍塌,断裂方向呈45°角。PEEK/Ta、PEEK/Nb与PEEK/Ta/Nb的屈服强度较PEEK(1.19MPa)分别提升了23.5%、6.7%与44.5%。
Polyetheretherketone(PEEK)has high heat resistance and excellent mechanical properties,suitable for the applications in high temperature environment of aviation.Light lattice structures can be produced by additive manufacturing(AM)to replace the conventional solid structure and realize the lightweight of aviation parts.Therefore,in this paper,the PEEK/Ta/Nb composite powders are prepared,and the triply periodic minimal surface(TPMS)gyroid lattice structures of PEEK/Ta/Nb were fabricated by high temperature–selective laser sintering(HT–SLS)additive manufacturing technique.The compressive properties of composite lattice structures were studied and the fracture mechanism was clarified.The results show that gradient gyroid lattice structure allows smooth transition at the cell junctions,but the stress concentrates at the inclined bar of large porosity,which can lead to a layerwise collapses at a 45°fracture direction.The yield strength of PEEK/Ta,PEEK/Nb and PEEK/Ta/Nb is increased by 23.5%,6.7%and 44.5%respectively compared with that of PEEK(1.19 MPa).
作者
蔡昊松
陈鹏
苏瑾
王明哲
王浩则
闫春泽
王卫
史玉升
CAI Haosong;CHEN Peng;SU Jin;WANG Mingzhe;WANG Haoze;YAN Chunze;WANG Wei;SHI Yusheng(State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China;Huake 3D Science Technology Ltd.of Zhejiang Province,Wenzhou 325004,China;Rearch Institute of Huazhong University of Science and Technology in Shenzhen,Shenzhen 518000,China)
出处
《航空制造技术》
CSCD
北大核心
2021年第15期52-57,65,共7页
Aeronautical Manufacturing Technology
基金
2019年产业技术基础公共服务平台项目–智能制造标准试验验证平台建设(2019–00899–1–1)
2020年温州市重大科技专项(工业类)自创区专项(ZG2020048)
深圳市知识创新计划基础研究项目(JCYJ20180213102634650)。
关键词
增材制造
高温激光选区烧结
聚醚醚酮
点阵结构
复合材料
Additive manufacturing(AM)
High temperature–selective laser sintering(HT–SLS)
Polyetheretherketone
Lattice structure
Composite
