Electronics > Projects, Designs, and Technical Stuff
vapor phase soldering - alternate liquids
wraper:
--- Quote from: jonroger on October 09, 2019, 10:47:42 pm ---Or maybe I just need to put more effort into finding a US source of less than 7kg of Galden HT230. But evidently it too is a mixture (alternative spelling prevented me from finding this).
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It's not a mixture in a sense it gets mixed. It's specially separated perfluoropolyethers with varying molecular size but with similar boiling temperature. Consider it similar to oil rectification to get different fractions.
--- Quote from: ejeffrey on October 09, 2019, 10:56:17 pm ---I think you don't really care about the concentration in the vapor phase.
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It's the thing you should care about the most. Once separation occurs in vapor phase, soldering temperature is screwed.
wraper:
In EU you can buy 500ml/ 900g of Galden. Dunno about air shipping to US though. https://eleshop.eu/vapour-phase-galden-ls-230-liquid-500ml.html
Maybe just try making group buy.
jogri:
Less inert means that you will probably get some ungodly new metal-organic compounds (and those are usually rather toxic) when your glycol starts to react with your solder. If you are especially lucky, it will also start reacting with the various plastics.
The only "alternative" that comes to my mind would be Dowtherm A given that it is not as reactive as your glycol mixtures, but it could also react with with your solder.
Changing the pressure is a bad idea since you need special equipment for that: If you want to pressurize it, you need to have a good filtration (it will leak into your room) and if you want to decrease the pressure you need a chemical vacuum pump (usually a diaphragm pump) because it will probably react with the hot parts in the pump. Also, you still need an inert liquid (no glycol etc).
ejeffrey:
--- Quote from: wraper on October 10, 2019, 03:28:56 am ---
--- Quote from: ejeffrey on October 09, 2019, 10:56:17 pm ---I think you don't really care about the concentration in the vapor phase.
--- End quote ---
It's the thing you should care about the most. Once separation occurs in vapor phase, soldering temperature is screwed.
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I was thinking that since you are heating the liquid the temperature would be set by the boiling point of the liquid phase, and as long as you can keep that from changing too much the soldering temperature wouldn't change either. But I guess I am not clear what happens in the vapor phase.
coppercone2:
--- Quote from: wraper on October 09, 2019, 10:32:07 pm ---
--- Quote from: coppercone2 on October 09, 2019, 09:44:15 pm ---unless it makes a eutectic solution
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It does not apply to boiling point. Constant boiling point mixture is called azeotrope. But you cannot adjust mixture proportions to get right temperature, there is only one particular sweet spot with those.
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mis used my word
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