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The Apparent Contact Angle and Wetted Area of Active Alloys on Silicon Carbide as a Function of the Temperature and the Surface Roughness: A Multivariate Approach

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Abstract

Despite the broad field of applications for active filler alloys for brazing ceramics, as well as intense research work on the wetting and spreading behavior of these alloys on ceramic surfaces within the last decades, the manufactured joints still exhibit significant variations in their properties due to the high sensitivity of the alloys to changing brazing conditions. This increases the need for investigations of the wetting and spreading behavior of filler alloys with regard to the dominating influences combined with their interdependencies, instead of solely focusing on single parameter investigations. In this regard, measurements of the wetting angle and area were conducted at solidified AgCuTi and CuSnTi alloys on SiC substrates. Based on these measurements, a regression model was generated, illustrating the influence of the brazing temperature, the roughness of the faying surfaces, the furnace atmosphere, and their interdependencies on the wetting and spreading behavior of the filler alloys. It was revealed that the behavior of the melts was significantly influenced by the varied brazing parameters, as well as by their interdependencies. This result was also predicted by the developed model and showed a high accuracy.

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Acknowledgments

This research was supported by the German Research Foundation (DFG Grant No.: TI-343/52-1, “In-Situ” Untersuchungen des Einflusses der Oberflächengüte und Interface-Reaktionen auf das Benetzungsverhalten verschiedener Lotsysteme auf Siliziumkarbid am GK-REM), Germany.

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Authors and Affiliations

  1. Institute of Materials Engineering, TU Dortmund University, Dortmund, Germany

    Wolfgang Tillmann (Head), Jan Pfeiffer (Research Associate) & Lukas Wojarski (Research Associate)

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  1. Wolfgang Tillmann
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  2. Jan Pfeiffer
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  3. Lukas Wojarski
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Correspondence to Jan Pfeiffer.

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Manuscript submitted October 21, 2014.

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Tillmann, W., Pfeiffer, J. & Wojarski, L. The Apparent Contact Angle and Wetted Area of Active Alloys on Silicon Carbide as a Function of the Temperature and the Surface Roughness: A Multivariate Approach. Metall Mater Trans A 46, 3592–3600 (2015). https://doi.org/10.1007/s11661-015-2938-9

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