Metco 450/NiGr on Aluminum?
06-27-2011, 03:10 AM,
#1
Metco 450/NiGr on Aluminum?
I am struggling to figure out whether or not metco 450 bond coat / 75/25 NiGr is a good idea on the ID of a 3" aluminum bore (grade C355).

The part will operate at 325F with excursions over 400F.

Does anyone have experience with mismatched coefficients of expansion? We had a test part failure at the substrate / bond coat interface and are debating whether it debonded due to mechanical stress or never bonded due to an unknown spray or prep issue.

Any suggestions for a bond coat / abradeable top coating on aluminum at sporty temperatures?

Is Metco 480 a safer bet than 450?

Thanks in advance! This board is a fantastic resource.
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06-27-2011, 04:44 AM, (This post was last modified: 06-27-2011, 04:45 AM by kschewe.)
#2
RE: Metco 450/NiGr on Aluminum?
450 or 480 is fine on aluminum at that temp. Many oems use that. Sometimes i also use moly on aluminum as a bond coat. Don't preheat the aluminum and make sure its gritblasted with coarse grit. Don't overheat the substrate, 300F max
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07-01-2011, 12:06 AM,
#3
RE: Metco 450/NiGr on Aluminum?
AL Bronze is the best bond coat for Aluminium substrates.
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