Neil:
Most of these coatings are applied at high heat and
sometimes referred to as plasma spray. Conversations
with various suppliers of this process are quick to
point out how proprietary the application and applied
material is. As you state, it is a great wear surface
and very durable. Only one other material I like as
well an that is the family of high silica aluminum
alloys (hypereutectics).
john
--- "Albaugh, Neil" <albaugh_neil@ti.com> wrote:
> John;
>
> I've always wondered about using electroless nickel
> plating on cylinder
> walls. It is easy to apply, it is a low-friction
> coating, and it heat-treats
> to a high hardness, so wear should be minimal. Hard
> chrome plating has been
> used for years in cylinders and I've wondered if
> electroless nickel could be
> a "poor man's hard chrome".
>
> Since electroless nickel plating deposits are pretty
> uniform thickness,
> perhaps grinding wouldn't be necessary like it is
> with hard chrome.
>
> Has anyone tried this or heard about it's being
> tried?
>
> Regards, Neil Tucson, AZ
>
>
>
> -----Original Message-----
> From: John Goodman [mailto:ggl205@yahoo.com]
> Sent: Sunday, May 04, 2003 5:40 AM
> To: land-speed@autox.team.net
> Subject: Addendum to Nikasil coated bores
>
>
> List:
>
> One or two motorcycle racers inquired about honing
> coated cylinder bores. I responded by saying that
> the
> procedure was very much like honing cast iron.
> Although the honing process is very similar to cast
> iron, these coatings are not very thick. Caution
> should be exercised when using various grit sizes to
> remove stock and generate a load bearing surface.
> With
> cast iron, the 80-100 grit abrasive is used to
> remove
> stock and set the ultimate valley depth. Nikasil
> type
> coatings will not tolerate such a course grit, nor
> is
> it needed. Whatever surface you wish to put on a
> coated bore, stock removal should be restricted to a
> safe ratio of coating thickness available. My
> experience points to removing no more that .002" of
> the coating. This is still enough to create most
> plateau and peak surfaces.
>
> Anybody racing the old Vega engine (or one like it)?
> Are you using the original high-silica alloy as the
> wear surface? Contact me if you are.
> John
>
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