Characterization of coating processes and coatings for steam turbine blades

Abstract
The exfoliated scale from boiler tubing results in hard particles that erode steam turbine components, particularly stationary and rotating blading. To select an erosion resistant protective coating for steam turbine blades, six promising coating processes comprising ten different coatings were selected for evaluation by erosiontesting, metallography, and mechanical tests of coated blade materials. This paper describes the results of the erosion tests and metallographical studies and discusses how erosion resistance is related to coating morphology.

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