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Open AccessArticle

Comparative Study on the Activity of GaF3 and Ga2O3 Nanoparticle-Doped CsF-AlF3 Flux for Brazing 6061 Al/Q235 Steel Joints

College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
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Crystals 2020, 10(6), 498; https://doi.org/10.3390/cryst10060498
Received: 6 May 2020 / Revised: 28 May 2020 / Accepted: 8 June 2020 / Published: 9 June 2020
(This article belongs to the Special Issue Intermetallic Compound)
The effect of trace amounts of GaF3 and Ga2O3 nanoparticles on the wettability and spreadability of CsF-AlF3 flux matched Zn-15Al filler metal were comparatively studied on 6061 aluminum alloy and Q235 low-carbon steel. The experimental results indicate that appropriate amounts of GaF3 and Ga2O3 added into the flux could significantly promote the Zn-15Al filler metal to wet and spread on the surface of 6061 aluminum alloy and Q235 low-carbon steel. The optimum ranges for GaF3 and Ga2O3 were 0.0075–0.01wt.% and 0.009–0.01 wt.%, respectively. Comparative analysis showed that the activity of CsF-AlF3 flux bearing GaF3 was higher than that bearing Ga2O3. The reason for this is that the former flux has a stronger ability to remove oxides of the base metal and reduce the interfacial tension of the molten filler metal and the base metal. View Full-Text
Keywords: spreadability; wettability; GaF3; Ga2O3; CsF-AlF3 flux spreadability; wettability; GaF3; Ga2O3; CsF-AlF3 flux
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Yao, Z.; Xue, S.; Zhang, J. Comparative Study on the Activity of GaF3 and Ga2O3 Nanoparticle-Doped CsF-AlF3 Flux for Brazing 6061 Al/Q235 Steel Joints. Crystals 2020, 10, 498.

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