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Whatever material you use to attempt to seal a CRT must have three propoerties:
1. It must survive the 600F oven temperatures during processing
2. It must have a thermal coefficient of expansion which matches very closely the glass/metal of the CRT
3. It must be impervious ie vacuum tight over a very long period of time.
It is not easy to find a material which has all three of these properties. The most likely candidates are:
1. Nickel metal plating to seal the leaks
2. Frit glass to seal the leaks
Bob and I have tested a high temperature epoxy with some success, but it has some TCE issues which may make it unsuitable. We continue to work the nickel plating and frit glass options.
If anyone has any other suggestions, Bob and I would be interested in hearing them.
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John Folsom
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