Abstract
Pure gold brazing of 96% alumina ceramic with CP titanium using electrical resistance heating has been analyzed. Wetting studies of gold with niobium and titanium were performed. HTCC alumina ceramic was metalized with a 500nm Nb layer yielding hermetic joints with Ti ferrule having leak rate of the order of 1.6×10 -8 atm-cc/ sec. Wetting studies of Ti with Au and EDX analysis at the Au- Ti interface revealed that all the four Ti-Au intermetallic compounds forms at the interface and to avoid the growth of these intermetallic compounds brazing time should be kept minimum. Nb also shows good wetting behavior towards molten gold. Adhesion strength of Nb thin film over polished alumina substrate was measured using nanoscratch testing using a nanoindentor on 100nm Nb thin film on alumina. Scratch testing revealed that strong and adherent thin films of Nb over polished alumina can be deposited using sputtering.
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