Investigation of ultrasound-assisted soldering of SiC ceramics by Zn-Al-In high-temperature solder


This work deals with the study of ultrasonic soldering of SiC ceramics by use of Zn-Al-In solder destined for higher application temperatures. The structure and properties of this soldering alloy were assessed. The Zn5Al1In solder consists of βZn matrix, where the βZn + αAl a (In) eutectics in the form of oblong and spherical clusters are non-uniformly distributed. The tensile strength of soldering alloy attained the value of 52 MPa. The soldered joint of SiC/Zn5Al1In/SiC was fabricated at the temperature of 420 °C at simultaneous acting of ultrasonic vibrations. The bond was formed owing to the formation of two new thin layers of Al + Si and Zn + C on the surface of SiC substrate. The average shear strength of SiC/Zn5Al1In/SiC joint attained 49 MPa. The fracture has occurred not only in the solder bulk but also in a close vicinity of SiC substrate. In this zone, similarly as on the fractured surface in the solder zone, the presence of In was identified, in which a considerable measure affected the resultant strength values.

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The authors thank Assoc. Prof. Ing. Viliam Hrnčiar, CSc. for the EDX analysis.


This work was supported by the Slovak Research and Development Agency under the contract no. APVV-17-0025. The paper was prepared also with the support of the VEGA 1/0089/17 project: Research of new alloys for direct soldering of metallic and ceramic materials.

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Correspondence to Igor Kostolný.

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Recommended for publication by Commission XVII - Brazing, Soldering and Diffusion Bonding

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Kostolný, I., Koleňák, R., Hodúlová, E. et al. Investigation of ultrasound-assisted soldering of SiC ceramics by Zn-Al-In high-temperature solder. Weld World 63, 1449–1459 (2019).

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  • SiC ceramics
  • Ultrasound
  • Higher application temperatures
  • Shear strength