Extending the Service Life of Gas Turbine Hardware: (I) Laboratory Investigation

Abstract

The possibility of extending the service life of the high pressure hardware for gas turbine engines using a novel repair procedure was evaluated in a laboratory study. In the laboratory simulation, both high and low activity platinum aluminide overcoatings of a partially stripped platinum aluminide were evaluated and contrasted. The results indicate that a chemically homogenous, relatively uniform thickness, platinum modified coating can be formed by low activity aluminizing on a substrate with surface areas of both bare alloy and partially stripped platinum aluminide coating. Furthermore, the CVD low activity platinum aluminide overcoat considered had better oxidation resistance than the original coating. The experimental program is outlined, plus the results are presented and discussed.