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Engineering
Materials and Chemical Engineering
Sodium Silicate dielectric? Vacuum Feedthrough
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[QUOTE="SupaVillain, post: 5445877, member: 531512"] After some in depth research I found through search of a sodium silicate based product (stixso rr from pqcorp) that it has about the same dielectric strength and specific resistivity in ohm centimeters as plate glass, a brochure stated. the reason this is important for feedthroughs is that stixso rr, which is basically entirely sodium silicate and water, after full dehydrated curing, is incredibly low outgassing, as NASA's outgassing database states. It is suitable for UHV feedthroughs where other adhesives, sealants, and epoxies are not. It expands as it cures so even if it is not truly adhesive to the chamber and the feedthrough, it will be pressing against them by its expansion, when I think of this it reminds me of how knife edge flanges seal just from pressing and biting into the gasket material. i wonder if knife edge flanges that are damaged could be used as molds for sodium silicate forms, if easily separated the could maybe make a perfect fit into knicks and dents on the knife edge seal, upon separating them one would place aluminum foil in between and put them back together for a possible seal. I've read a patent where aluminum foil (i think household foil rather than special purpose) was proven as a low cost gasket material. i would also think sodium silicate water glass could be used for sight glasses, especially smaller kinds just big enough for laser entry, or larger ones that could have had lead powder added safely to their mix before they were cured, for the purpose of radiation shielding. curing temp and time can be found not too difficultly but IIRC they say heat them slowly up to 200 F and hold that temp, i think about 40 minutes in it should be dehydrated/fully cured [/QUOTE]
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Sodium Silicate dielectric? Vacuum Feedthrough
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