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| Vapour phase Soldering |
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| mrpackethead:
That wenesco machine seems to have a two zone system. I'm wondering, if they use two different fluids.. If you stuck two different fluids in the same container, and heated them, would you get two different vapour zones? one one top of the other? |
| jeremy:
--- Quote from: mrpackethead on January 23, 2015, 08:51:48 am ---That wenesco machine seems to have a two zone system. I'm wondering, if they use two different fluids.. If you stuck two different fluids in the same container, and heated them, would you get two different vapour zones? one one top of the other? --- End quote --- In my research I found that people used to use two layers to increase the vapour retention and decrease the thermal gradient for the board. Galden SVP is the second fluid name, where svp stands for Soft Vapour Phase. See: http://amtest.bg/products/Asscon/Galden%20PFPE%20Fluids%20Data%20Sheet.pdf I also found that this has been somewhat phased out. Not sure why though. |
| Kjelt:
Thinking about the heating element/system. If you look at pro kitchen equipment, they only place a heater under the stainless steel container for temperatures up to 90 degrees C (like warmwater baths, bain marie). Above those temperatures like in frying equipment (180 to 200 degrees C typically) they place the heating element inside the stainless steel container making contact with the fluid. So would it be allowed for this vapour chemical to be in direct contact with the heating element or would that not be advised? |
| jeremy:
--- Quote from: Kjelt on January 23, 2015, 09:00:44 am ---Thinking about the heating element/system. If you look at pro kitchen equipment, they only place a heater under the stainless steel container for temperatures up to 90 degrees C (like warmwater baths, bain marie). Above those temperatures like in frying equipment (180 to 200 degrees C typically) they place the heating element inside the stainless steel container making contact with the fluid. So would it be allowed for this vapour chemical to be in direct contact with the heating element or would that not be advised? --- End quote --- Perfluorocarbons decompose into fluorine gas and HF, and the MSDS for galden lists >290 as the decomposition temp. However, before that temp, this class of chemicals are one of the most inert chemicals know to mankind (http://www.epa.gov/chemrtk/pubs/summaries/perfluro/c13244rt3.pdf). So I don't think there is any problem having direct contact, as long as your element doesn't go over 290C. I was thinking of just using some sort of iron core element and putting a thermocouple in there. Also, this: http://www.ebay.com.au/itm/MULTICORE-SOLDERS-VAPORETTE-/111436980268 which was an early commercial system, used external heating. But no temp control? I am not a chemist though, ymmv, etc. |
| mrpackethead:
--- Quote ---In my research I found that people used to use two layers to increase the vapour retention and decrease the thermal gradient for the board. Galden SVP is the second fluid name, where svp stands for Soft Vapour Phase. See: http://amtest.bg/products/Asscon/Galden%20PFPE%20Fluids%20Data%20Sheet.pdf I also found that this has been somewhat phased out. Not sure why though. --- End quote --- I found that link as well, but it seems its disappeared as well. It would be interesting to know why they don't use it. |
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