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https://www.ias.ac.in/article/fulltext/boms/039/02/0587-0591

Joining; ceramics; interfaces; microhardness; brazing strength; Helium leak test.

Alumina was joined with alumina using microwave-assisted and conventional brazing methods at 960$^{\circ}$C for 15 min using TiCuSil (68.8Ag–26.7Cu–4.5Ti in wt.%) as the brazing alloy. The brazed joints were characterizedby X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, Vickers microhardness evaluation, brazing strength measurement and helium leak test. X-ray diffraction analysis confirmed the formationof Ti-based compounds at the substrate-filler alloy interfaces of the microwave and conventionally brazed joints. The elemental compositions at the joint cross-section were determined by energy dispersive X-ray analysis. Vickers microhardness measurement indicated reliable joint performance for the microwave-assisted brazed joints during actual application in an electron tube. Brazing strength measurement and helium leak test provided the evidence forgood alumina-alumina joint formation.

Published

15 April 2016

Manuscript received

12 August 2015

Accepted

6 November 2015