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RE: [TCML] keeping primary copper tubing nice and shiny
Then nickel plating followed by gold plating sounds like the best option...
Copper is soluble in gold, so it would slowly diffuse to the gold plating -
hence the need for a nickel layer first.
... I'll try car wax in the meantime. I tried the RS spray sold to protect
pcb plates from oxidizing (I think it is cellulose-based). It works well for
plates but it did not protect the primary very well.
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of nancylavoie@xxxxxxxxxxx
Sent: 17 January 2010 16:55
To: Tesla Coil Mailing List
Subject: Re: [TCML] keeping primary copper tubing nice and shiny
Aside from asthetics,this really seems to be more of a drawback in cost than
anything.Silver,as stated,will tarnish and look worse perhaps than untreated
copper.Nickel I would think would have the tendency to flake off as you are
trying to secure it to your primary coil frame (or former) as it isn't as
soft as copper.Gold would overcome these issues but come on...Clearcoating
seems to be the obvious choice at the expense of the ability to make tuning
adjustments later.This reminds me of a saying I used to hear from one of
hotrodding friends in regards to aftermarket parts: "Chrome dosent get you
home!" Wyatt
Sent from my Verizon Wireless BlackBerry
-----Original Message-----
From: G Hunter <dogbrain_39560@xxxxxxxxx>
Date: Sun, 17 Jan 2010 08:01:07
To: Tesla Coil Mailing List<tesla@xxxxxxxxxx>
Subject: RE: [TCML] keeping primary copper tubing nice and shiny
Gary, you are correct. Pure silver is a much better conductor than silver
oxide according to this ham radio site:
http://hamwaves.com/antennas/coils.html
Quote:
"At a temperature of 20°C (293.15K), silver (Ag) has a resistivity of
1.58·10-8Om, which is the lowest of all metals, and a temperature
coefficient of 0.0038K-1. Silver[I] oxide (Ag2O) at this temperature has a
500 times higher resistivity of 8·10-6Om and a temperature coefficient of
0.004620K-1 [3]. Nonetheless it is still considered to be a conductor,
whereas both copper[I] oxide (Cu2O) and copper[II] oxide (CuO) are
semiconductors at room temperature."
Close quote.
Nuf said,
Greg
--- On Sat, 1/16/10, Lau, Gary <Gary.Lau@xxxxxx> wrote:
> From: Lau, Gary <Gary.Lau@xxxxxx>
> Subject: RE: [TCML] keeping primary copper tubing nice and shiny
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Saturday, January 16, 2010, 11:16 PM
> I don't think that's true.
> Please cite a reference?
>
> > Silver oxide is a better conductor than metallic
> silver.
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