Repair process for coated articles

Abstract

A process for repairing a metal component includes sintering a mixture comprising particles of a coating composition and particles of a brazing alloy to form a composite preform; disposing the composite preform on an uncoated surface of the metal component; and heating the preform to a temperature effective to form a brazed joint between the composite preform and the metal component.

Description

technical field [0001] The present disclosure generally relates to methods of repairing damaged portions of coated metal components. More specifically, it relates to methods of repairing damaged portions of coatings on turbine engine components. Background technique [0002] Metal components are used in a wide variety of industrial applications under different operating conditions. In many cases, the components have coatings that impart various properties, such as corrosion resistance, heat resistance, oxidation resistance, and / or wear resistance. For example, various components of a turbine engine, typically capable of withstanding operating temperatures of about 1100 degrees Celsius (° C.) to about 1150° C., are often coated with a thermal barrier coating (TBC) to effectively increase the temperature at which they can operate. Typically, the TBC is applied over an intermediate bond coat (sometimes referred to as a "bond coat," "stick coat," or "bond coat") that is applie...

AI Technical Summary

Problems solved by technology

For example, there will be overspray at the edge of the part to be filled, the manipulator has limited vision and cannot reach certain areas, the seam between the original coating and the repair patch is difficult to fit closely, elements with complex geometries (such as propellers, blades and shrouds) are difficult to apply properly and / or time-consuming and costly to apply

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