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Reduced mass materials are critical to the success of aerospace systems. Thus, large air and space structures can benefit from lightweight composite materials. However, their adoption is impaired by the lack of a robust, cost-effective fabrication process, principally because the autoclaves used to consolidate composite laminates are so expensive for large parts. This program develops for US aeros ...

HIGHER THRUST/WEIGHT ENGINES AND HYPERSONIC VEHICLES REQUIREHIGH TEMPERATURE STRUCTURAL MATERIALS THAT DO NOT EXIST TODAY. ADVANCES IN STATE OF THE ART MATERIALS, PARTICULARLYFIBER REINFORCEMENTS, ARE REQUIRED TO MEET THE NEEDS OF THESE APPLICATIONS. COMMERCIALLY AVAILABLE CVD SIC FIBERS SUFFER FROM POOR CREEP RESISTANCE, A RESULT OF FREE SILICON FOUND AT THE GRAIN BOUNDARIES. THIS PROBLEM, A DIRE ...

MERCURY CADMIUM TELLURIDE (MCT) ALLOYS ARE OF MAJOR IMPORTANCE FOR NONCRYOGENICALLY COOLED 1.0 TO 16.0 MU M (IR)DETECTOR ARRAYS. WIDESPREAD DEPLOYMENT OF MCT ARRAYS BASED ON HIGH SENSITIVITY PHOTODIODES HAS BEEN SLOWED BY THE DEARTH OF REPEATABLE GROWTH PROCESSES CAPABLE OF PRODUCING HIGH QUALITY FILMS AND DEVICES WITH ABRUPT OR CONTROLLED JUNCTIONS. A NEW UNASSISTED PYROLYTIC METAL ORGANIC CHEMIC ...

Future aeropropulsion systems require high temperature electronics and integrated sensors to meet desired performance levels. The wide bandgap of silicon carbide (SiC) makes it ideally suited for high temperature operation. To date, virtually all SiC-based devices have been fabricated using 6H-SiC. Device performance would significantly increase if 3C-SiC, the cubic form, were available. 3C-SiC ha ...

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