圆柱面点阵自生Al_(2)O_(3)铝合金粉芯丝材开发及应用  

Development and application of insitu Al_(2)O_(3)aluminum alloy powder core wire for cylindrical lattice

作　　者：唐论 余圣甫[1] 郑博 史玉升[1] 陈颖 TANG Lun;YU Shengfu;ZHENG Bo;SHI Yusheng;CHEN Ying(State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,武汉430074

出　　处：《航空学报》2023年第9期63-74,共12页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金重大项目(51790174)。

摘　　要：基于Al和NiO的冶金反应设计了圆柱面点阵电弧增材制造自生Al_(2)O_(3)铝合金粉芯丝材,进行了热分析;制备了直径1.2 mm的自生Al_(2)O_(3)铝合金粉芯丝材,研究了其工艺性能,分析了自生Al_(2)O_(3)的尺寸、形貌,并测试了单元杆的热导率和强度;利用该粉芯丝材在直径157 mm的圆柱面上成形了两层金字塔点阵结构。结果表明:Al和NiO冶金反应的最大反应速率温度为1038.9℃,能够在电弧增材制造条件下可靠进行;粉芯中含1.5%NiO的铝合金粉芯丝材在电弧增材制造中电弧稳定、熔滴呈均匀小颗粒过渡、过程平稳、飞溅率小于0.74%。研发的粉芯丝材成形点阵单元杆表面粗糙度小于10.40μm,自生成了大量的密排六方α-Al_(2)O_(3),尺寸在50~300 nm之间,与铝基体的界面结合良好;单元杆的热导率为103.68 W/(m·K),平均抗拉强度达到了288 MPa;成形的圆柱面点阵单元杆直径误差在±0.1 mm以内,倾角误差在±0.9°以内,具有较高的精度。在隔热实验中点阵测试件上下表面的温差超过400℃,具有良好的隔热性能。点阵测试件的抗压强度约65 MPa,压缩性能较稳定。Based on the metallurgical reaction of Al and NiO,an in-situ Al_(2)O_(3)aluminum alloy powder core wire for cylindrical lattice wire arc additive manufacturing is designed,followed by its thermal analysis.The in-situ Al_(2)O_(3)aluminum alloy powder core wire with a diameter of 1.2 mm is prepared,its process performance is studied,the size and morphology of the in-situ Al_(2)O_(3)are analyzed,and the thermal conductivity and strength of the unit rod are tested.The powder core wire is used to form a double-layer pyramid lattice structure on a cylindrical surface with a diameter of 157 mm.The results show that the maximum reaction rate temperature of the metallurgical reaction of Al and NiO is 1038.9℃,which can be carried out reliably under the conditions of wire arc additive manufacturing.The aluminum alloy powder core wire with 1.5%NiO has stable arc,uniform small particle transition,stable process,and spatter rate of less than 0.74%in wire arc additive manufacturing.The surface roughness of the unit rod formed by the powder core wire is less than 10.40μm,and a large amount of close-packed hexagonalα-Al_(2)O_(3)is generated in situ with the size between 50-300 nm,and the interface with the aluminum matrix is well bonded.The thermal conductivity of the unit rod is 103.68 W(/m·K),and the average tensile strength reaches 288 MPa.The diameter error of the formed cylindrical lattice unit rod is within±0.1 mm,and the inclination error is within±0.9°,which has high accuracy.In the heat insulation experiment,the temperature difference between the upper and lower surfaces of the lattice test piece is more than 400℃,which has good heat insulation performance.The compressive strength of the lattice test piece is about 65 MPa,and the compression performance is stable.

关 键 词：圆柱面点阵结构 电弧增材制造 自生Al_(2)O_(3) 铝合金粉芯丝材 工艺性能 

分 类 号：V252.2[一般工业技术—材料科学与工程] TG422.3[航空宇航科学与技术—航空宇航制造工程]