Hi Dalibor,
for now I use this cement here:
http://www.zircarceramics.com/pages/cem-rig/specs/al-cem.htm
I think David from this group here pointed me to that site.
You can order samples very easily; this substance is a little brittle
;-), though. It does not require a bakeout for hardening, room
temperature is just fine, it will only take a few minutes.
But I am also interested in a more professional solution. Any ideas?
Jens
Hello guys,
I am looking for any information about how the alumina compound for
vacuum tubes is prepared.. It is used to insulate electrodes (what
should not glow) and also support some joints inside the tubes. It
look like a white ceramics..
Alumina is not soluble in water/ethanol etc.. so some binder must take
place.. I found, that binder consists of water, methanol and aluminum
nitrate. I prepared a compound according to one patent (60% alumina,
40% binder made from aluminum nitrate water and ethanol), but it
didn't make hard compound (even when baked).. It just flaked of the wire..
Is there anyone who have some closer info about that or could point me
somewhere?
I used Dieter's picture (thanks), You can see two white drops of
alumina here..
Thanks, Dalibor
--
Dalibor Farny
http://dalibor.farny.cz
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