Effects of the Chemical Compositions of KF-CsF-AlF₃ Middle Temperature Aluminum Flux on Melting Characteristics

Abstract:

According to the KF-CsF-AlF₃ ternary phase diagram, 25 samples (named group A) near the region around the E₄ and E₅ (ternary eutectics points), and 22 samples (named group B) near another region around the e₅ (binary eutectic point) and m₂ (ternary eutectics point) were prepared by the wet synthesis method. The melting curves of these samples were measured by differential scanning calorimetry (DSC). Based on the DSC data, the effects of the fluxs compositions on the melting characteristics were analyzed and summarized. The results indicated that the lowest solidus of group A samples was about 480°C, meanwhile, their liquidus was about 520~530°C, and the melting range was approximately 40°C. Furthermore, when the content of CsF was lower than 18mol%, the solidus of group A samples apparently rose to about 510°C, but the liquidus did not change greatly. The lowest solidus of group B samples was about 420°C, meanwhile, their liquidus was below 450°C, and the melting range was approximately 20~30°C. So, with this profile of melting characteristics, some of the samples of group B flux would be good substrates for aluminum alloy middle temperature brazing, with good prospects for application.

• Periodical: Advanced Materials Research (Volume 716)
• Pages: 191-198
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.716.191
• Online since: July 2013
• Authors: Fang Jie Cheng, Jun Feng Yao, Ying Wang, Jun Xiang Yang, Guan Xing Zhang, Wei Min Long
• Keywords: KF-CsF-AlF₃ Flux, Melting Characteristics, Middle Temperature Aluminum Flux, Wet Synthesis Process

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