Abstract: Disclosed is a method and apparatus of fabricating three-dimensional heat transfer enhancing features on a surface of a substrate, the three-dimensional heat transfer enhancing features having a predetermined desired shape on a surface of a substrate. A mask is supplied, the mask having a pattern formed therein. The pattern is selected based on the predetermined desired shape of the three-dimensional heat transfer enhancing features to be fabricated. A jet of impinging coating particles is sprayed through the mask towards the substrate. A portion of the jet is selectively blocked with the pattern in the mask to fabricate the three-dimensional heat transfer enhancing features on the substrate.

Abstract: An apparatus and method are described for deposition of materials such as particulate materials onto a surface. The methods employ the use of shockwaves or compression waves to project the particulate material onto the surface as desired. This allows for the preparation of solid objects or coated surfaces that exhibit, for example, superior density and uniformity.

Abstract: A cold gas dynamic spray system is provided that includes a powder feeder for providing a metallic powder. A carrier gas source provides a carrier gas. A nozzle assembly includes multiple plates secured to one another. One of the plates provides a nozzle profile, such as a venturi, having a gas carrier inlet receiving the carrier gas. The nozzle profile also provides a powder injection region receiving the metallic powder In one example, a profile plate includes an aperture providing the venturi. The venturi includes converging and diverging portions joined by a throat. The carrier gas inlet is in communication with the converging portion upstream from the throat. The powder injection region is in communication with the diverging section downstream from the throat. The profile plate includes an end from which the intermixed metallic powder and carrier gas exit the nozzle assembly.

Abstract: An apparatus and method are described for deposition of materials such as particulate materials onto a surface. The methods employ the use of shockwaves or compression waves to project the particulate material onto the surface as desired. This allows for the preparation of solid objects or coated surfaces that exhibit, for example, superior density and uniformity.