Patent ID: 8387245

Claim:
A method of fabricating a component, the method comprising: forming one or more grooves in a surface of a substrate, wherein the substrate has at least one hollow interior space, wherein each of the one or more grooves extends at least partially along the surface of the substrate and has a base and a top, wherein the base is wider than the top such that each of the one or more grooves comprises a re-entrant shaped groove; forming one or more access holes through the base of a respective one of the one or more grooves, to connect the groove in fluid communication with respective ones of the at least one hollow interior space; and disposing a coating over at least a portion of the surface of the substrate, wherein the one or more grooves and the coating define one or more re-entrant shaped channels for cooling the component; wherein the one or more re-entrant shaped grooves are formed by directing an abrasive liquid jet at the surface of the substrate; wherein the one or more re-entrant shaped grooves are formed by directing the abrasive liquid jet at a lateral angle relative to the surface of the substrate in a first pass of the abrasive liquid jet and then making a subsequent pass at an angle substantially opposite to that of the lateral angle.