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Subject: Re: [Homebrew_PCBs] Inkjet printing to make powdered copper

From: Stefan Trethan <stefan_trethan@...>
Date: 2004-01-20

;-) good luck ;-)

(sorry steve, couldn't shut it.. useless post i know)

On Sat, 20 Mar 2004 13:06:51 -0800, Richard Mustakos <rmustakos@...>
wrote:

> Brewers,
> I want to try using an inkjet to moisten a mix of Cu, Sn/Pb and flux
> powders to make them stick together and to a substrate. Then I can dump
> or blow the remaining dry powders off and reflow the solder to hold the
> copper to the substrate. I've been looking for powdered copper, solder
> and flux. I've had some success with finding copper (10g/$, 0.5 kg
> min). So far, no joy on powdered (dry) flux. Powdered solder exists,
> and I have even seen references to flux coated solder (reduces
> oxidation), but so far, I have not found a company that sells powdered
> solder. They only seem to produce it for use in solder paste. Do any
> of you know of an electronics friendly, dry flux powder? Water soluble
> is even better. I've found a number of flux powders, but they all seem
> to be for brazing. One that I don't know what it's used for is Ammonium
> Chloride: UnitedNuclear.com says: "Ammonium Chloride is a common
> soldering flux used for joining metals together." Does anyone know if
> NH4Cl is suitable for electronics? If so, I can get 2 oz for $2 there.
> Any ideas on solder powder supplies?
> Do any of you live in Southern California? I don't have a laser printer
> yet, and would like to try a couple of things. I'm in the Thousand Oaks
> area. Now that you know, please don't stalk me ;-)
> RM
>
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