Method of applying braze materials to a substrate
AssigneeHickman Industries, Inc.
InventorHans Van Esch
Life of this patent
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Abstract
A HVOF process is used for applying brazing materials to repair surfaces of a substrate such as a turbine blade. The brazing material is applied in powdered form and is free of binders and adhesives. The brazing materials may be any one or more of a nickel based, cobalt based or ferrous based high temperature brazing material. Alloys of these elements may be used together with a temperature depressing melting point element such as boron or silicon.
Claims23
A method of applying braze materials to a substrate, said method comprising the steps of
- obtaining a substrate requiring repair;
- generating a high velocity combustion gas stream;
- passing binder-free high temperature brazing material into said gas stream to entrain and melt the brazing material therein;
- directing the brazing material entrained gas stream against and along at least one portion of the substrate requiring repair to form a deposit of brazing material thereon;
- and
- thereafter heat treating the substrate.
A method of repairing a turbine blade having at least one surface crack therein, said method comprising the steps of
- generating a high velocity combustion gas stream;
- passing binder-free high temperature brazing material into said gas stream to entrain and melt the brazing material therein;
- directing the brazing material entrained gas stream against and along the crack in the turbine blade to form a deposit of brazing material thereon;
- and
- thereafter heat treating the turbine blade.
A repair deposit on a substrate comprised of a brazing material characterized in being binder-free and carbon-free and having a porosity of less than 2%.
A substrate having at least one repair deposit thereon, said repair deposit characterized in being binder-free and carbon-free and having a porosity of less than 2%.
A turbine blade having at least one repair deposit thereon, said repair deposit characterized in being binder-free and carbon-free, in having a porosity of less than 2% and in being selected from the group consisting of at least one of nickel-based, cobalt-based and ferrous-based brazing material.
Dependencies are inferred from the claim text.