Method of producing nickel base alloy structure with NiAl coatin

Details Method of producing nickel base alloy structure with NiAl coatin Method of producing nickel base alloy structure with NiAl coatin

1981-04-29

1984-12-04

Dean, R.

Metal treatment

Compositions

Heat treating

148162, C22F 110

Patent

active

044862458

ABSTRACT:
A structure comprising a main body formed of a nickel base alloy, and a NiAl coating applied to the main body, wherein the NiAl coating includes a nickel rich NiAl layer and an aluminum rich NiAl layer and the thickness ratio of the nickel rich NiAl layer to the whole NiAl coating is in a range between 20 and 40%. A method of applying an aluminum coating to a nickel base alloy comprising the steps of forming an aluminide layer of Ni.sub.2 Al.sub.3 on the surface portion of the nickel base alloy by the diffusion and penetration of aluminum, and subjecting the alumide layer to heat treatment to change the aluminide layer to a monoaluminide layer and making the thickness ratio of a nickel rich NiAl layer to the whole monoaluminide layer be in the range between 20 and 40%.

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