Monolithic Approach to Oxide Dispersion Strengthened Aluminum, Phase I

Nassau Stern Company is investigating an approach for manufacturing oxide dispersion strengthened (ODS) aluminum in bulk rather than powder form. The approach combines novel ceramic injection molding technology to produce preforms for subsequent pressure infiltration casting with aluminum. The preforms contain between 30 and 40 volume percent sub-micron aluminum oxide and 60 to 70 volume percent nano-porosity. The resulting ODS aluminum could be near net-shape or as a billet ready for secondary processing. If successful, this approach will eliminate defects associated with consolidating powders into bulk form, such as contamination, adsorbed gas and non-uniform packing. Elimination of these defects will allow the ODS aluminum to perform closer to theoretical tensile strength, especially at elevated temperatures. ODS aluminum is also expected to possess exceptional elevated temperature fatigue behavior, vital for aerospace propulsion components and structures. The high level of aluminum oxide will also improve thermal expansion and stiffness behavior of the ODS aluminum. The envisioned elevated temperature performance of ODS aluminum will open up a wide range of space and aviation applications not feasible for conventional aluminum alloys.

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