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Quality Control of Thermal Spray Coatings in Diesel Engines

Abstract Thermal spraying is a method, which is suitable for coating of large components. The coatings can e. g. improve the wear, friction and/or corrosion properties of components so that they can withstand the increased loads. The quality of the coatings is essential to ensure reliable operation of the components. However, quality control of thermally sprayed coatings is indeed nontrivial and sample preparation is a key issue. This paper shows examples of thermal spray coated components in large diesel engines and provides insight into the methods used in preparing samples for quality control.