High temperature alloy article with a discrete protective coatin

Details High temperature alloy article with a discrete protective coatin High temperature alloy article with a discrete protective coatin

1996-02-26

1999-04-27

Thibodeau, Paul

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428668, 428670, 428680, 148535, B32B 1510, C22F 109

Patent

active

058979662

ABSTRACT:
An environmental resistant spot type coating is provided on a selected, discrete surface area of a high temperature operating article, by applying to the area a layer of at least one of the elements selected from Pt, Rh and Pd, and preferably Pt, to a thickness of about 0.0002" to less than 0.0006" and an average distribution of at least about 0.07 grams per square inch. The layer is heated at about 1800-2050.degree. F. for about 1/2-4 hours to diffuse the element with the surface area. Then the layer is aluminided to provide an average total coating thickness of about 0.001-0.005". The article provided includes an environmental resistant additive coating diffused with the selected discrete area. The coating comprises an outer portion of at least about 17 wt. % of the selected element, and an aluminide of the surface area or substrate. In one form, the outer portion is a two phase outer portion: a first phase of an aluminide of the selected element at a content of at least about 40 wt. % interspersed with a second phase comprising an aluminide in which Al is at least about 20 wt. %. Between the outer portion and the surface area is an inner portion which is a diffusion zone comprising diffused selected element along with an aluminide and/or elements diffused from the surface area.

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Abstract--Derwent Publications database--Samsung Aerospace Ind Co "Coating Platinum Aluminide Film Nickel Base Superalloy Polish Clean Surface Electroplating Platinum Film Diffusion Nickel Platinum Layer Heat Treat" Inventor: W Kang XP 002050840.
Article entitled "High Temperature Stability of Pack Aluminide Coatings on IN738LC" by SP Cooper and A Strang, Central Meallurgical Laboratories pp. -250-260.

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