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Article #2363Re: old thread Re: DIY Soldering iron tips
From: Eric Y. Chang
Date: Wed, 30 Oct 2002 18:25
Date: Wed, 30 Oct 2002 18:25
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N. Thornton (bigcat@meeow.co.uk) wrote: ... : maybe I'm mistaken, but it at least sounds quite straightforward. Put : the copper bit in a glass tube, held up on glass, put scraps of iron : in the tube, pass flammable gas thru the tube, and heat the iron : pieces. The iron evaporates and lands on the copper bit, while the gas : prevents it oxidising. Does this really work? What is the vapor pressure of iron at comfortable temperatures for glass? What is the driving force causing the iron vapor to preferentially condense on the copper? Have you tried this or seen it done? The flux of iron vapor will be an axial diffusion across the stream of gas. It will be driven by the differing vapor pressures of iron at the supposedly cooler copper tip vs the iron pieces. This diffusion flux will be substantially smaller than the flow rate. So the deposition will be attenuated by the ratio of the characteristic times for convection to diffusion. The latter will be on the order of seconds, while the former will be on the order of days. Most of the iron (small amount anyway) should leave the tube. Have you tried this? It seems like a very interesting process.
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,c54d4710fc9f0faf X-Google-Attributes: gid112d1e,public X-Google-Thread: 103407,c54d4710fc9f0faf X-Google-Attributes: gid103407,public X-Google-ArrivalTime: 2002-10-30 10:25:29 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!logbridge.uoregon.edu!nntp-server.caltech.edu!ericc From: ericc@nntp-server.caltech.edu (Eric Y. Chang) Newsgroups: sci.electronics.design,aus.electronics Subject: Re: old thread Re: DIY Soldering iron tips Followup-To: sci.electronics.design,aus.electronics Date: Wed, 30 Oct 2002 18:25:28 +0000 (UTC) Organization: California Institute of Technology, Pasadena Lines: 22 Message-ID: <app86o$kjm$2@naig.caltech.edu> References: <811bdbb6.0210261339.46e72904@posting.google.com> <a7076635.0210281346.5bcd7bbc@posting.google.com> <3dbe394e$0$22477$8eec23a@newsreader.tycho.net> <C3ZlrNAMHlv9EwHc@jmwa.demon.co.uk> <a7076635.0210300546.28afc949@posting.google.com> Reply-To: ericc@alumni.caltech.edu NNTP-Posting-Host: alumnus.caltech.edu X-Trace: naig.caltech.edu 1036002328 21110 131.215.49.51 (30 Oct 2002 18:25:28 GMT) X-Complaints-To: abuse@caltech.edu NNTP-Posting-Date: Wed, 30 Oct 2002 18:25:28 +0000 (UTC) X-Newsreader: TIN [version 1.2 PL2]