圆柱面点阵自生Al2O3铝合金粉芯丝材开发及应用

doi:10.7527/S1000-6893.2022.26864

Abstract

Abstract:

Based on the metallurgical reaction of Al and NiO， an in-situ Al₂O₃ aluminum alloy powder core wire for cylindrical lattice wire arc additive manufacturing is designed， followed by its thermal analysis. The in-situ Al₂O₃aluminum 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 Al₂O₃are 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 1 038.9 ℃， 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 10.40 μm， and a large amount of close-packed hexagonal α-Al₂O₃ 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.

Key words: cylindrical lattice structure, wire arc additive manufacturing, in-situ Al₂O₃, aluminum alloy powder core wire, process performance

CLC Number:

V252.2

Lun TANG, Shengfu YU, Bo ZHENG, Yusheng SHI, Ying CHEN. Development and application of in⁃situ Al₂O₃ aluminum alloy powder core wire for cylindrical lattice[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(9): 626864-626864.

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References 22

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工艺序号	单元杆质量m₁/g	粉芯丝材堆积前质量m₂/g	粉芯丝材堆积后质量m₃/g	飞溅率γ/%
#1	1.34	200.11	198.76	0.74
#2	1.38	200.08	198.69	0.72
#3	1.45	200.12	198.66	0.68

测试项目	热导率/（W·m^-1·K^-1）	屈服强度/MPa	抗拉强度/MPa	延伸率/%
1.5%NiO	103.68	132	287.6	14.2
0%NiO	138.86	121	266.8	15.5

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Development and application of in⁃situ Al₂O₃ aluminum alloy powder core wire for cylindrical lattice

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Development and application of in⁃situ Al2O3 aluminum alloy powder core wire for cylindrical lattice

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Development and application of in⁃situ Al₂O₃ aluminum alloy powder core wire for cylindrical lattice