<davidc__>
looks like melting temp for that is ~1600
<whitequark>
davidc__: how I'm going to ensure it is always under argon?
<SpeedEvil>
Calcium silicate seems pretty inert
<davidc__>
whitequark: Oh, just build a box around the works and run argon into it
<whitequark>
You could probably do that
<davidc__>
I mean, my giant tank of Argon for .al welding was like $50 to fill
<davidc__>
and that'll displace a hell of a lot more than you need!
<whitequark>
here, Ar is $3 per 150L STP
<davidc__>
150L is a _lot_
<whitequark>
It costs $30 to get a taxi to the station :p
<whitequark>
well, no, more like $15
<whitequark>
still, five times
<whitequark>
davidc__: I just don't want to bother doing this in atmosphere. I already am making a vacuum induction furnace
<davidc__>
fair enough
<whitequark>
It's just as simple at that point, and superior in every respect
<davidc__>
what are you using for pumping?
<whitequark>
I bought the cheapest 1stage rotary vane pump I could find. it has no words on it except "2CFM"
<whitequark>
Ostensibly for A/C but it totally works in continuous for extended intervals
<whitequark>
as in, days.
<davidc__>
Are you going to try and do a cold trap / etc?
<davidc__>
(as in, so you don't deposit metal inside the pump)
<SpeedEvil>
A sublimation pump is quite decent to get reasonable removal of oil backstreaming
<whitequark>
I am going to get a cold trap in dry ice/acetone bath (prefer to carry it around over LN2 in a thermos flask; I'm too cheap for a dewar) but not sure if I will use it for this
<SpeedEvil>
Ti film
<whitequark>
I have a ~1m bellows connecting the chamber to the pump
<whitequark>
the desc suggests putting it in a microwave
<whitequark>
I love how the dude posts something like an alumina plate and then adds to every single description "Your imagination is the only limiting factor in the spectrum of possible applications for this component."
<SpeedEvil>
There are _lots_ of venfors on alibaba
<SpeedEvil>
Take lead/antimony, float the lithium on it with LiCl between
<SpeedEvil>
(under argon at 400C)
<SpeedEvil>
Voila, battery.
<whitequark>
local shop quotes me $150/kg at MOQ
<SpeedEvil>
For lithium?
<whitequark>
yeah
<SpeedEvil>
I want that local shop
<whitequark>
assuming you figure out how you ship HAZMAT out of RU, I will send it to you
<SpeedEvil>
I stalled on that project when I realised that my naive implementation was potentially vulnerable if it got knocked to spontaneous discharge.
<whitequark>
they also have very interesting things
<whitequark>
they mail-order hydrazine (!!!)
<SpeedEvil>
Which involves ~15 bar of lead/antimony/lithium/fluorine/chlorine at 2200C
<SpeedEvil>
If it goes all the way
<whitequark>
Ohhh yeah that high-temperature battery. IIRC there was also a design based on Fe?
<SpeedEvil>
whitequark: Is actual Li hazmat?
<whitequark>
it is hazmat.
<whitequark>
batteries have metallic Li, which is why they are also hazmat.
<SpeedEvil>
In metallic form?
<whitequark>
it reacts with water and gives off a lot of hydrogen
<whitequark>
no shit it is hazmat
<SpeedEvil>
I gues.
<whitequark>
oh I know this eastern european vendor on ebay, they ship calcium and sodium (in cans under argon) internationally
<whitequark>
they are fucking nuts
<whitequark>
lt's see if they have lithium for you
<SpeedEvil>
Interesting.
<SpeedEvil>
Unfortunately my 'I can do this' cell was basically large trays of the molten components with no seperators.
<SpeedEvil>
While this in principle works, it gets way more complex if I need to do it properly - once I realised that shorting is an actual concern
<SpeedEvil>
The metals can mix at a poorly limited very rapid rate
<SpeedEvil>
dumping all their heat
<whitequark>
Just stand a few meters back, upwind
<whitequark>
And don't forget to record it and put on Youtube
<SpeedEvil>
~80kg, ~15 bar and 2000C of heavy metals and fluorine/chlorine/... is more in the chemical weapons class than 'just stand upstream.
<whitequark>
Ok. Agreed. Put it on liveleak instead
<whitequark>
the difference of RU patent from US patent is that they pump the sampled gas inside the case and around the capillary that is permeable to helium, thus making the gradient larger and more easily detectable
<whitequark>
costs $6k new
<berndj>
SpeedEvil, what's the salt in that Li / Pb-Sb cell?
<_Sync_>
whitequark: I don't think that it works at the levels we need
<whitequark>
mm, I see
<whitequark>
I suppose the point is moot as my plan is to get an RGA anyway
<SpeedEvil>
berndj: Li*
<SpeedEvil>
berndj: Chloride, bromide, iodide and fluoride
<SpeedEvil>
I think maybe not bromide
<SpeedEvil>
You can leave some out, but the operating temperature then goes up
<whitequark>
SpeedEvil: well, at least those halogens are bound, and you aren't getting a metal-fluorine fire
<whitequark>
merely a metal-chlorine fire
<SpeedEvil>
whitequark: well, in the worst case that I can't exclude - what happens is you get a propagating metal-metal mixing, which then heats to ~2800C or so.
<SpeedEvil>
This then rapidly boils the electrolyte
<SpeedEvil>
(the salts)
<SpeedEvil>
It's perhaps technically not free Fluorine.
<SpeedEvil>
And explodes the container
<_Sync_>
fun!
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<_Sync_>
hmm the new scope is actually pretty usable
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