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December 1999

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Subject:
From:
Paul Klasek <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 3 Dec 1999 09:31:34 +1100
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Why don't you try Ti Nitride coatings Ralph,
there are 3-4 different colours/formulations (apart from the oldest goldish
one);
they're relatively cheap, work superbly ;
it's basically a ceramic coat, with mildly different hardness ratios .
Metal finish is always inferior to ceramic coats ;
and those nowadays go even to engines = quite common .
Microcrystalline alumina is way out of any metal's reach ;
as you're moving just below diamond ceiling in carborundum strata .

You can also get the part sintered fully from ceramic compound,
if possible/necessary/affordable = pending application

Let me know if you get stuck or need more details,
with application

Paul Klasek (aka the carbon fan [as all of us])
ResMed

PS
The cer coats being hard are fragile = you still need a very good (hard)
base,
and treat the part as an egg .
Than the polish (lengthy, automated, as glass polish) = smooth surface, will
lengthen the life of the surface.
Still, keep in mind you're in 9.th (10.th diamond) scale with alumina,
don't expect infinite service .

PPS
The synthetic diamond has been formed in few labs,
but we'd be in straight vertical stratosphere on $'s .

NB
Just hook on search engines with "ceramic coats" and "ceramic tool bit (or
tip)" ;
should give you plenty options .
Cer. tip could be the one for you


-----Original Message-----
From: Vaughan, Ralph H [mailto:[log in to unmask]]
Sent: Friday, 3 December 1999 5:50
To: [log in to unmask]
Subject: [TN] anti-abrasion finish


Hi TN,

A follow-up query to a recent posting about sand-type abrasion for you
metalheads (Dave H., you there?); Is there a metal finish that will
withstand rubbing wear from aluminum oxide powder?  we have tried tungstun
carbide and stellite with 'no joy'.    Any light bulbs going on?

Thanks for thinking

Ralph Vaughan

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