Abstract: A heat exchanger and method of making same are disclosed. In another aspect, a method of making a heat exchanger includes sintering powder metal and hot isostatic pressing of the powder metal. Moreover, an aspect of the present heat exchanger apparatus employs plates in a stacked arrangement with supercritical-CO2 flowing between the plates and between adjacent fins. Still another aspect of a heat exchanger apparatus is made of a nickel-based alloy.

Abstract: Techniques for reactive deposition are disclosed herein. In one embodiment, a method includes providing laser energy into a deposition environment, the laser energy having a focal point and introducing a first precursor material and a second precursor material into the deposition environment at or near the focal point of the provided laser energy, thereby causing the first and second precursor materials to melt and react to form a composite material different than both the first and second precursor materials. The method also includes allowing the formed composite to solidify by moving the focal point of the provided laser energy away from the melted first and second precursor materials.