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George Lendich wrote:
Dale,
What is it, what does it consist of?
George ( down under)
Aluminized Titanium Nitride
Titanium Nitride is the gold-tone stuff you see on a lot of the
"better" drill bits, of late.
Dale R.
Dale,
Very good but the substrate aluminum has to have high density, which is insufficient in most castings. Hence the steel liner.
George (down under)
That may be; but there is no particular reason, as yet, to believe
that they are doing it that way. They could make the end-walls
twice as thick, and they would still be less than two-thirds the
weight of the steel end housings.
The technology for applying a hard, anti-scuff coating such as
AlTiN/TiAlN is actually less problematic than trying to make
a steel liner stay attached.
Dale R.
Dale,
I agree entirely, a flat steel liner is problematic. I also agree the coating you suggest is excellent, probably fantastic.
However you have to understand that no matter how good the surface treatment if the substrate is insufficient the surface will fail as the substrate moves or compresses - no matter how thick the aluminum is, it will still move or compress. This has been the underlying problem with aluminium end housings. A flat steel liner would have to be 5mm thick to avoid moving/ drumming under these side loads.
I gave up trying to make aluminum housings with a steel wear plate, when I came to the realization that there was little weight advantage.
The det gun coatings penetrate deep into the aluminum surface and at the same time compress the surrounding aluminum, making it much denser. Another way is a composite aluminum, I suggested steel grains in the aluminum matrix, but this poses other problems - another suggestion might be ceramic grains/ powder mix with the aluminum prior to injection molding. Mixed components have to be compatible or it poses a whole host of problems. Mistral may have found such a composite as there latest endeavour is a much denser material. But remember denser may mean heavier as well.
You have to remember that these engine manufacturers such as Mistral, Powersport tried every process known to man, within budgetary restraints and within their own expertise AND THEY ALL FAILED, except the det gun process thus far.
George (down under)
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