Ira and Matthew...
I had a browse of Kohl. Chpt 15 is Cathode Materials and Structures,
pages 519 - 573. There are seven pages of References.
If I knew which of the boggins of cathode materials are involved it would be
easier. Too much info :-(
Many cathodes start with a carbonate and cook it during evacuation to
produce the oxide.
An active oxide would react with water and CO2 in the atmosphere (at least).
Other cathodes end up with the active metal available through complicated
reactions.
That metal would definitely react with air - water, oxygen, CO2 and probably
Nitrogen (at least).
No idea if any of the above is reversible. The porous nature of the surface
is critical too - I can see humidity causing probs with structure.
I think I have an RCA Review [journal] that has specific details of a CRT
gun cathode. I was looking for all I could find on interface
resistance/impedance years ago and have a lot of cathode info packed away.
I am off to browse the info Ira pointed at...
John K.
Australia
----- Original Message -----
From: "Matthew Smith" <m...@smiffytech.com>
To: <neonixie-l@googlegroups.com>
Sent: Tuesday, April 29, 2014 12:56 PM
Subject: Re: [neonixie-l] Neon size limitations?
Quoth JohnK at 2014-04-29 11:37 ...
...
What is the chemical after later exposure to air?
And is oxygen the problem? (And does the problem apply to more recent
CRTs.)
Just pondering whether it might be possible to broach the vacuum under a
gas flood (like Ar/CO2) to mitigate damage.
--
Matthew Smith
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