On 4/6/13 6:55 AM, Bob Camp wrote:
Hi
On Apr 6, 2013, at 9:39 AM, Jim Lux <jim...@earthlink.net> wrote:
On 4/6/13 6:08 AM, Lester Veenstra wrote:
Any TimeNutter worth his/her salt can do that..right!
$100 Presto 23 qt canning style pressure cooker, electric heating elements,
thermocouple probes, some fiberglass insulation to reduce conductive losses.
Do it in your backyard and have a straw broom handy to detect hydrogen fires.
Be careful.. 400C is getting close to 660C aluminum melting point. I'm also
not sure the gasket in the pressure cooker can take that temperature.. you
might want to replace it with something else.
Here's the reaction vessel:
http://www.target.com/p/presto-23-quart-aluminum-pressure-cooker-canner/-/A-660065#prodSlot=medium_1_5
Now, if it's the 1000C+ that Magnus mentioned, that's a bit trickier.. Probably
need a ceramic container.
Gee, another use for the Big Green Egg…. I wonder how BBQ grease impacts the
annealing process :)
I suggest heading on down to the garden store for some clay pots..
I don't think I would want 1000+ C hydrogen running around in a lash up system.
There are just to many ways for things to go wrong.
John Strong's book has a picture of how to do it.. Shows small flames
(invisible, of course) coming from the lid of the ceramic crucible
wrapped in resistance wire and immersed in some sort of refractory sand.
I've seen hydrogen brazing being done at a TWT manufacturing plant, and
it's pretty low tech. One could definitely do it in your backyard,
maybe even your apartment balcony. I don't know that I'd be generating
the hydrogen by using aluminum foil in pool acid, but that's more out of
laziness than anything else: getting a tank from the local gas supplier
is pretty easy. The pressure of the H2 is basically slightly over
atmospheric. Heated to 1000C, it's going to ignite where it leaks out,
which is good, so you don't have a problem with hydrogen accumulation
(and even that isn't an issue in the backyard) Since the flames are
invisible, that's why you need that broom. (or the fancy IR viewing
goggles, I suppose)
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