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Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
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Posts: 615
A quick search suggests higher frequencies will be better as you can achieve higher shear at lower amplitudes. I think that will be important for filling tiny spaces - maybe even go ultrasonic. More power will always be better too. Do you have access to a sonar transducer? That would be capable of ~100W at 80kHz
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
I'm not convinced curing under pressure is a good idea. You might end up permanently embedding stress in your encapsulant, making it more prone to cracking in the future. Or worse, you trap a bubble at 50psi, which will break things when you let the pressure go.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
I too think that applying pressure during setting is not a good idea; . as above, high pressure bubbles could be trapped in the silicone . if the vacuum was adequate there should be no air pockets to form bubbles . pressure vessel design is more difficult
After mixing your silicone and catalyst de-gas it before introducing to the vacuumed object to be potted.
Calculate/estimate the heat generated by each potted component as silicone rubber is an incredibly poor conductor of heat and local hotspots can destroy the rubber. VERY frustrating to have your latest work of the art encapsulated in charred/bubbled silicone :(
This is the rubber that I bought for my diy solar panels, seems ok, no idea if still available,
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
ok ill consider that. i still need a pressure vessel for other purposes.
i mostly worry about these tiny windings packed together tightly, and the honey like viscosity of the silicone. iggies and flybacks obviously do it well.
i have 24 minutes of low viscosity then after 30 minutes it gets noticeably thicker.
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
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Posts: 615
Maybe try adding a thinner? Like It would not only lower viscosity, it also increases cure time - both of which would be an advantage for potting. It does reduce cured strength, but for potting I don't see that as a problem.
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Soft Encapsulants.
