Abstract: A nickel base repair alloy comprises a blend of about 40 to 60 wt % of a first nickel based braze alloy containing boron, about 15 to 35 wt % of a first nickel based filler material, and the remainder consisting of a blend of a second nickel based filler material and a low melting eutectic braze nickel based alloy.

Abstract: A nickel base repair alloy comprises a blend of about 40 to 60 wt % of a first nickel based braze alloy containing boron, about 15 to 35 wt % of a first nickel based filler material, and the remainder consisting of a blend of a second nickel based filler material and a low melting eutectic braze nickel based alloy.

Abstract: The present invention is directed to a process for repairing cracks in a turbine engine component. The process comprises the steps of providing a component, preferably formed from a single crystal nickel based material, with at least one crack, applying a repair alloy composition containing a single crystal nickel based alloy, a first nickel based braze alloy and a second nickel based braze alloy to the crack(s), and subjecting the component with the applied repair alloy composition to a thermal cycle to diffuse the repair alloy composition into the crack(s).

Abstract: The present invention relates to a maskant system for use with a fluoride cleaning system. The maskant system comprises a parting compound applied to a surface which requires protection and a chromium rich maskant for substantially preventing intergranular attack and which reduces a depletion zone. The parting compound contains colloidal silica, de-ionized water, fused alumina grains, and alumina powder. The maskant is comprised of chromium powder mixed with a binder, a wetting agent, a thickening agent, and water. The maskant system may be used to clean components formed from nickel-based or cobalt-based alloys using a fluoride cleaning system and has particular utility when components formed from single crystal nickel based alloys are cleaned using a fluoride cleaning system.

Abstract: The present invention relates to a maskant system for use with a fluoride cleaning system. The maskant system comprises a parting compound applied to a surface which requires protection and a chromium rich maskant for substantially preventing intergranular attack and which reduces a depletion zone. The parting compound contains colloidal silica, de-ionized water, fused alumina grains, and alumina powder. The maskant is comprised of chromium powder mixed with a binder, a wetting agent, a thickening agent, and water. The maskant system may be used to clean components formed from nickel-based or cobalt-based alloys using a fluoride cleaning system and has particular utility when components formed from single crystal nickel based alloys are cleaned using a fluoride cleaning system.

Abstract: The present invention relates to a self cleaning braze paste which is used in the repair of gas turbine engines. The braze paste comprises lithium fluoride in an amount sufficient to act as a flux which allows the braze material to flow into a crack or void in a part to be repaired up to an amount where there is no residual lithium or fluoride in the crack or void, preferably up to about 20% by volume, a gel binder in an amount up to about 15% by volume, and the balance comprising at least one of a nickel braze alloy and a cobalt braze alloy. In a preferred embodiment, the lithium fluoride is present in an amount from about 10% to about 15% by volume. The braze material of the present invention may be applied in a paste form or, alternatively, in a paint or tape form. A method for cleaning and repairing a braze joint is also disclosed.

Abstract: A method and assembly useful in metal joining processes is disclosed which blocks the deposition of molten metal in openings. The method and assembly employs mica material with a binder to block the flow of molten metal. In one detailed embodiment, the mica material supports elements of the articles being brazed.