Apparatus having engineered surface feature and method to reduce wear and friction between cmc-to-metal attachment and interface

A method to reduce wear and friction between ceramic matrix composite (CMC)-to-metal attachment and interface of an apparatus, comprising:

• providing a CMC component having a surface;
• providing a metal component having a surface;
• arranging the surface of the CMC component in sliding contact with the surface of the metal component, the sliding contact resulting in formation of debris along the sliding contact surfaces;
• substantially preventing an accumulation of debris along the sliding contact surfaces of the CMC component relative to the contacting surface of the metal component during operation of the apparatus.