making silver grease? - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: November 12, 2021, 07:04:58 pm
content: So I have silver powder that I wanted to use for making ceramic PCB but I also thought to try to make some silver laiden grease. I could make a gram or so to apply with a micro applicator, maybe to some IGBT pads. My silver is between 2000 to 4000 mesh.I moreso then anything wanted to create a sample before buying MG Chemicals 8463. I see they use a silane. I have seen other conductive silver grease made with mineral oil. I thought to mix it with CRC Silicone grease in a little cup by weight, 2/3 silver to 1/3 grease. Do you think that will make a OK grease?Does the silver need to be like fumed or mixed with carbon, akin to carbon-coated-aluminum (german dark) for it to work in such a grease mixture? I see its added into the mix, but I suspect it maybe has to do with improving silver flow and protecting it from oxidation as a coating more so then a filler/cut.My goal is to do contact resistance tests on crimps at high currents with precise equipment.

author: wraper
author_rank: Unknown
timestamp: November 12, 2021, 07:15:30 pm
content: QuoteI don't see a point. Best thermal pastes don't use any silver, are cheaper and are not conductive. They is no point in silver paste other than bragging about its price or if you really need it to be electrically conductive.QuoteHow is it supposed to help?

author: coppercone2
author_rank: Super Contributor
timestamp: November 12, 2021, 07:20:20 pm
content: Because I want to study it, its for the contact pads not the thermal pads, the spring contacts. I am also curious how much connection losses are reduced by such expensive additives.This is meant to be a electrical contact improver.https://www.mgchemicals.com/products/grease-for-electronics/electrically-conductive-grease/contact-grease/https://www.cool-amp.com/conducto-lubeI have miliohm LCR meter and other tools needed to do a high current test. I also had to refinish the pads so 'pitted' might be an issue there. Seems like the 'proper' choice.I am sure you can see my interest in making a sample of something similar when I already have spare silver and materials on hand?

author: floobydust
author_rank: Super Contributor
timestamp: November 12, 2021, 07:46:02 pm
content: Also consider lifetime, what happens a year from now. Silver oxidizes and that could be the worst aging mechanism. I think the base grease is critical, that it lasts.In the electrical industry, there is:Sanchem electrical contact grease NO-OX-IDKOPR-SHIELD, contains colloidal copper.For aluminum conductors, NOOXAL or NO-OX-ID-A, contains fine zinc particles which break through the Al oxide film.When I looked atthermalcompounds they are mainly zinc oxide in silicone oil.In the PC industry, they have very little silver, just enough to add that to the product name.Arctic Silver 5?% Silver5% Boron Nitride (aka white graphite, a ceramic powder)30-40% Zinc Oxide5% Aluminum OxideBase DiPhenylamine as "Synthetic polymer" Polyol EsterCoolermaster HTK-002-U130% Aluminum Oxide20% Zinc Oxide14% Silicon dioxide3% Titanium Dioxide1.2% Calcium carbonate3% Magnesium OxideBase steric acid, palmitic acidThermal Grizzly Kryonaut65% Aluminum Powder25% Zinc Oxide10% SiliconesMG Chemicals 860 Silicon Heat Transfer Compound70% Zinc Oxide3% Silica PowderBase silicone oil?

author: coppercone2
author_rank: Super Contributor
timestamp: November 12, 2021, 07:49:13 pm
content: http://images.salsify.com/image/upload/s--s1s21HSB--/tjpydfunckf8xbzzsubh.pdfThat grease is 90% the same ingredient as the MG-CHEMICALS silver grease. I thought if I mixed that with silver powder it would be good.The silver powder is shiny and reacts with bleach to clump up and turn black when exposed. Will amorphous fumed silica interfere with anything?

author: TimFox
author_rank: Super Contributor
timestamp: November 12, 2021, 08:31:27 pm
content: A little pedantry:Silver does not oxidize under normal conditions: silver tarnish is asulfide, Ag2S, from reaction with sulfur compounds in the atmosphere (from various industrial processes, etc.).Seehttps://byjus.com/questions/what-is-the-chemical-formula-for-corrosion-in-copper-and-silver/

author: jpanhalt
author_rank: Super Contributor
timestamp: November 12, 2021, 09:23:04 pm
content: Like wraper said, it is completely unclear what you want to accomplish.If you want a highly thermally conductive and electrically non-conductive "grease" there are products on the market or DIY with BN (boron nitride). It is cheap and readily available (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6723785/). Many other citations are easily found.If you want something that does both (i.e., is electrically conductive) use a solder.

author: coppercone2
author_rank: Super Contributor
timestamp: November 12, 2021, 09:54:30 pm
content: Quote from: coppercone2 on November 12, 2021, 07:20:20 pmi don't know why this is unclear. i linked the products I want to mimic in the beginning of the thread.

author: coppercone2
author_rank: Super Contributor
timestamp: November 14, 2021, 07:03:31 pm
content: I will make 2g of 30% silver mineral oil mix and attempt to make 2g of 30% silver CRC-Silicone mix, when I find some vialsDoes anyone know if mineral oil is compatible with a resin 3d printed SLA container? I thought to make a micro lip-balm style container for it. Or maybe I will just keep it in syringes