Metallic protective coatings and method of making
OwnerJohn Foster, Eric C. Kedward +2inventors
InventorsJohn Foster, Eric C. Kedward, Francis J. Honey, James E. Restall
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Abstract
A substrate such as a single crystal gas turbine blade is given a protective coating by composite electrodeposition of a metal matrix M.sub.1 containing particles of CrAlM.sub.2, where M.sub.1 is Ni or Co or Fe and M.sub.2 is Y, Si, Ti, or a rare earth element. The preferred matrix is Ni or Co or NiCo and the preferred particles are CrAlY. The particle size is important and preferably 75% by weight are between 3.9 and 10.5 .mu.m. The coating is heat treated to produce interdiffusion between the constituents of the matrix and the particles.
Claims23
A coated substrate produced by composite electrolytic deposition, on a substrate of a coating, consisting of a metal matrix M.sub.1 containing particles comprising CrAlM.sub.2, where M.sub.1 is Ni or Co or Fe or two or all of these metals and M.sub.2 is Y, Si, Ti, a rare earth element or two or more of these elements.
A method of producing a coating on a substrate which comprises electrolytic deposition of a metal matrix M.sub.1 from a bath containing particles of CrAlM.sub.2 so as to codeposit the particles with the matrix, M.sub.1 being Ni or Co or Fe or two or all of these metals and M.sub.2 being Y, Si, Ti, a rare earth element or two or more of these elements.
A substrate carrying an overlay coating of M.sub.1 CrAlM.sub.2, where M.sub.1 is Co, Ni or NiCo and M.sub.2 is Y, Si, Ti or two or all of Y, Si and Ti, the coating having been applied by electrolytic deposition of a matrix of M.sub.1 from a bath containing particles of CrAlM.sub.2 so as to codeposit the particles with the matrix, the coating having in the as-deposited state more than 97% by weight of the deposited particles below 15 .mu.m, the coating having been heat treated to produce a minimum of 3 weight percent of Al in the matrix.
A coated substrate produced by composite electrolytic deposition, on a substrate of a coating comprising a metal matrix M.sub.1 containing particles of CrAlM.sub.2 having in the as-deposited state more than 97% by weight of the deposited particles below 15 .mu.m, where M.sub.1 is Ni or Co or Fe or two or all of these metals and M.sub.2 is Y, Si, Ti, a rare earth element or two or more of these elements.
Dependencies are inferred from the claim text.