织构化表面对异质金属润湿性及界面反应的影响

doi:10.7527/S1000-6893.2021.25166

Abstract

Abstract: Stainless steel and aluminum alloy are widely used in welding of tunnel tubes and compensators in rocket storage tanks.Fusion brazing has become the main connection method, but the joints obtained by fusion brazing suffers from low stress cracks, which can easily cause fuel leakage and other problems.To improve the reliability of the joint, this study used ultrafast laser processing to ablate the surface of stainless steel, and prepared two typical textured surfaces:micro-groove and micro-pit surfaces.Through the in-situ wetting test of aluminum alloy on the surface of stainless steel, the influence of two micro-textures on the wetting and spreading direction, contact angle and interface reaction products was studied.The results show that the aluminum alloy exhibits a tendency of wetting and spreading along the processing direction of the micro-grooves, while the spreading of the micro-pits is close to a circle.On the micro-grooves' surface shows a smaller contact angle.Based on the Wenzel equation, the contact angles on the two micro-textured surfaces are calculated numerically, and the calculated results are slightly larger than the actual results.Finally, the influence of the interfacial metallurgical reaction on the wetting and spreading of the material's surface is analyzed.The results show that the interfacial reaction can accelerate the wetting and spreading processes and promote the wettability to a certain extent, but excessively coarse interface reaction products will hinder the wetting and spreading process.The laser texturing method can be used not only for stainless steel and aluminum alloy systems, but also for connections between other metals, and between metals and non-metals in the aerospace field.

Key words: ultrafast laser processing, surface micro-texture, Wenzel equation, contact angle, wetting and spreading

CLC Number:

YANG Jin, LIU Zhiyang, ZHAO Yixuan, LIU Hongbing, YU Zhishui. Effect of textured surface on wettability and interfacial reaction of heterogeneous metals[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(3): 425166-425166.

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Effect of textured surface on wettability and interfacial reaction of heterogeneous metals

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