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Article

Inducing the Effect of a Ga2O3 Nano-Particle on the CsF-RbF-AlF3 Flux for Brazing Aluminum to Carbon Steels

College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
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Author to whom correspondence should be addressed.
Crystals 2020, 10(3), 183; https://doi.org/10.3390/cryst10030183
Received: 15 January 2020 / Revised: 1 March 2020 / Accepted: 5 March 2020 / Published: 7 March 2020
(This article belongs to the Special Issue Intermetallic Compound)
In this study, a Ga2O3 nano-particle was added into CsF-RbF-AlF3 flux to develop a highly active flux for brazing aluminum alloy to steel, and the spreadability and wettability of Zn-Al filler metal that matched the CsF-RbF-AlF3 flux-doped Ga2O3 nano-particle on the steel were investigated. The results showed that the spreadability and wettability of the CsF-RbF-AlF3 flux-doped Ga2O3 nano-particle could be remarkably improved when matching Zn-Al filler metals on both aluminum and low-carbon steel, for which the optimal content is in the range of 0.001–0.003 wt.% of Ga2O3. An investigation and analysis on the mechanism of reactions among CsF-RbF-AlF3-doped Ga2O3 nano-particle flux and filler metal or base metals showed that the Ga2O3 nano-particle is selectively absorbed by the interface of molten Zn-2Al filler metal and base metal, which released the surface-active element Ga to enrich the molten Zn-2Al filler metal and decreased the interfacial tension, so as to promote the enlargement of its spreading area during the brazing process. It was concluded that adding a trace amount of Ga2O3 nano-particle into CsF-RbF-AlF3 flux is a meaningful way to improve the activity of flux for brazing aluminum to steel compared with adding ZnCl2, which poses the risk of corrosion on aluminum. View Full-Text
Keywords: Ga2O3; flux; Zn-Al filler metal; wettability; spreadability Ga2O3; flux; Zn-Al filler metal; wettability; spreadability
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MDPI and ACS Style

Yao, Z.; Xue, S.; Yang, J.; Zhang, J. Inducing the Effect of a Ga2O3 Nano-Particle on the CsF-RbF-AlF3 Flux for Brazing Aluminum to Carbon Steels. Crystals 2020, 10, 183. https://doi.org/10.3390/cryst10030183

AMA Style

Yao Z, Xue S, Yang J, Zhang J. Inducing the Effect of a Ga2O3 Nano-Particle on the CsF-RbF-AlF3 Flux for Brazing Aluminum to Carbon Steels. Crystals. 2020; 10(3):183. https://doi.org/10.3390/cryst10030183

Chicago/Turabian Style

Yao, Zhen, Songbai Xue, Jinlong Yang, and Junxiong Zhang. 2020. "Inducing the Effect of a Ga2O3 Nano-Particle on the CsF-RbF-AlF3 Flux for Brazing Aluminum to Carbon Steels" Crystals 10, no. 3: 183. https://doi.org/10.3390/cryst10030183

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