Re: electroless nickel for low rf attenuation?

Thanks for suggestions on other platings, but I am interested specifically
in electroless nickel.  What type of electroless nickel is best for low rf
attenuation?  --Grant


"Grant Kiehne" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> I am interested in coating some aluminum parts for an RF (~100 MHz)
> application.  Is electroless nickel boron the best choice for high
> electrical conductivity, over electroless nickel phosphorus?  I am
> interested in minimizing the RF attenuation.  What level of boron is best?
> Are there vendors who have expertise in electroless nickel boron?  It does
> not seem to be as common as electroless nickel phosphorus.  Why?  Any
> information would be helpful.
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> Cheers,
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> Grant
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> My 11/15/2003 posting to sci.chem.coatings, sci.materials,
> sci.physics.electromag:
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> What is the bulk electrical conductivity of a typical electroless nickel
> deposit as a function of phosphorus content?  Specifically:
>
> 1. Conductivity over the range 1% to 12.5% phosphorus by weight?  For
> example, is there a significant difference in conductivity between low-,
> mid- and high-phosphorus deposits?  Particularly, for 11-12.5% phosphorus
> (high-phosphorus), is the conductivity higher or lower than for lower
> phosphorus content?
> 2. DC (low frequency) and RF (up to 100 MHz)?  Is there a significant
> component to the resistivity attributed to the magnetic response of low-
and
> mid-phosphorus deposits?  What is the best type of electroless nickel for
> rf/microwave applications?
> 3. Does low temperature annealing (~135 deg. C) have any effect on the
> electrical conductivity?
>
> Grant
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