Protective coating
AssigneePraxair S.T. Technology, Inc.
InventorJohn Foster
Life of this patent
Estimating the term…
Abstract
A method of producing a coating on a substrate by electrolytically co-depositing a metal matrix M.sub.1 and particles of CrAlM.sub.2, where M.sub.1 is Ni, Co or Fe or two or all of these elements and M.sub.2 is Y, Si, Ti, Hf, Ga, Nb, Mn, Pt, a rare earth element or two or more of these elements. The co-deposition is carried out at a current density of less than 5mA per square centimeter. Preferably, the co-deposition forms a layer less than 50 microns thick, and occurs at a bath loading of less than 40 grams per liter of the particles. In a preferred embodiment, the particle size distribution in the plating bath is 25 percent between 15 and 12 microns, 45 percent between 12 and 10 microns and 30 percent less than 10 microns. The method is particularly useful for coating a gas turbine part.
Claims10
A method of producing a coating on a substrate which comprises depositing by electrolytic deposition a metal matrix M.sub.1 from a bath containing particles of CrAlM.sub.2, said bath having a particle distribution of 25 percent between 15 and 12 microns, 45 percent between 12 and 10 microns and 30 percent of less than 10 microns, to co-deposit the particles with the matrix in the form of a layer wherein M.sub.1 is at least one element selected from the group consisting of Ni, Co, and Fe and M.sub.2 is at least one element selected from the group consisting of Y, Si, Ti, Hf, Ta Nb, Mn, Pt and rare earth elements, said deposition being carried out at a current density of less than 5 mA per square centimeter, the layer being less than 50 microns thick.
A method of producing a coating on a substrate to be subjected to a high temperature environment, which comprises depositing by electrolytic deposition a metal matrix M.sub.1 from a bath containing particles of CrAlM.sub.2, said bath having a particle distribution of 25 percent between 15 and 12 microns, 45 percent between 12 and 10 microns and 30 percent of less than 10 microns, to co-deposit the particles with the matrix in the form of a layer wherein M.sub.1 is at least one element selected from the group consisting of Ni, Co, and Fe and M.sub.2 is at least one element selected from the group consisting of Y, Si, Ti, Hf, Ta, Nb, Mn, Pt and rare earth elements, said deposition being carried out at a current density of less than 5 mA per square centimeter and at a bath loading of less than 40 g/l of the particles, the layer being less than 25 microns thick.
Dependencies are inferred from the claim text.