DFliyerz - 18-2-2017 at 12:05
I'm planning to make an electrical resistance furnace using firebrick and resistance wire hooked up to a Variac, and I was wondering; do firebricks
provide enough resistance to leaks to make it viable to install an inert gas port so I could pump argon or nitrogen in, and maintain a reasonable
positive pressure without wasting a ton of gas?
elementcollector1 - 18-2-2017 at 13:04
Not at all, no. Gas-tight chambers are generally not constructed with loosely-placed components. Now, if you had an inner chamber that was made of
welded steel, that would be a lot better.
Alternatively, you can use steel plumbing pipes and nickel-graphite anti-seize compound to get a vacuum seal at very high temperatures.
yobbo II - 18-2-2017 at 13:26
You could put the welded steel box on the outside either.
Sulaiman - 17-8-2025 at 18:36
I GUESS that making a gas-tight oven is expensive
but if there are only small leaks then accepting a little gas loss
may be significantly cheaper,
unless you plan to go into significant repeated production.