X-Ray Radiography of Alumina to Kovar Joining
Engineering and Technology Journal,
2008, Volume 26, Issue 5, Pages 520-527
AbstractIn this work alumina samples were used to be joined with kovar alloy by using
different filler types . Fillers were formed with different concentrations of Silver ,
Copper , and Titanium powdered metals . These fillers where by mixing powders
and compacting by hydraulic press , and sintering by tube furnace with argon
atmosphere of 1100 oC and time of 60 min. Alumina/Kovar assemblies were joined
in vacuum furnace of pressure of 2x10-4 torr at temperature of 850 oC and time of
20 min. .X-ray radiography was used evaluates and detect the defect in contact area
Thrtee types of defects were detected namely craqcks , voids and Non uniformity .
Shear test was achieved to determine joint strength . Correlation between shear test
(destructive test) and X- ray radiography (Non destructive test) was found .
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