ROUGHENED COATINGS FOR GAS TURBINE ENGINE COMPONENTS

摘要

A gas turbine engine component with an aluminide coating on at least a portion of an airflow surface that includes a roughening agent effective to provide a desired surface roughness and a deposition process for forming such aluminide coatings. A layer including a binder and the roughening agent may be applied to the superalloy substrate of the component and the aluminide coating formed on the airflow surface portion by exposing the component and layer to an appropriate deposition environment. Suitable roughening agents include metal and ceramic particles that are dispersed on the airflow surface portion before exposure to the deposition environment. The particles, which are substantially intact after the aluminide coating is formed, are dispersed in an effective number to supply the desired surface roughness.