Recent developments in the manufacture of metal matrix composite precursors by physical vapor deposition techniques have created an opportunity to fabricate high-quality, fine-gage composite wires having precise dimensions and fiber volume fractions. specially designed dies will be used to draw… More

The utilization of graphite/aluminum (gr/al) composites in engineeringstructures has been severely limited by low transverse tensile strength. however, recent developments in the manufacture of metal matrix composite by physical vapor deposition techniques have resultedin thin-sheet gr/al composites… More

Thin-walled tubular structures are extremely useful for struts and joints in lightweight trusses for space platforms, for antenna support systems, and, perhaps, even for waveguides. on the basis of mass-specific properties, graphite-fiber-reinforced magnesium (gr/mg) composites have the greatest… More

The national aero-space plane (nasp) program will develop manned hypersonic airplanes (mach 6-25) that will provide orbit-on-demand capability from conventional runways, thereby revolutionizing access to space. however, success will depend upon the development of new, light-weight structural… More

A new class of metal matrix composites (mmc's) based on polymeric reinforcements was recently shown to be feasible in our laboratories. properly designed, such composites would have low density in addition to high strength, toughness, and fatigue resistance. moreover, the acoustic damping capacity… More

Our recent efforts in fabricating thin-gauge graphite/magnesium composites have resulted in the first such material to have a zero coefficient of thermal expansion and no perceptible dimensional hysteresis during cycling over the entire orbital temperature range of -250 degrees fahrenheit, even… More

Successful development of hypersonic flight vehicles and engines will depend heavily upon rapid development of new, high-temperature metal matrix composite (mmc's). fiber reinforced titanium aluminide alloys have great potential to meet the engineering requirements of such structures. considerable… More

Reliability and circuit density of standard electronic modules (sem) can be increased significantly by tailoring thermophysical properties of the heat sink materials. newly developed techniques for manufacturing metal matrix composites (mmc) by vapor deposition methods will be used to demonstrate… More

Large, periodic temperature excursions cause significant dimensional changes in large orbiting space structures. similarly, large ground-based antennas and optical systems are subject to diurnal dimensional changes that diminish precision and sensitivity. our recently developed graphite/magnesium… More

Many current and planned defense aerospace programs depend critically upon rapid development of lightweight composite materials having unprecedented high-temperature properties. continuous fiber reinforced intermetallic matrix composites (imc's) have the potential to meet these performance… More

Advanced turbine engines and flight vehicles will depend upon new, high-temperature metal matrix composites (MMC's) to meet performance goals. Engineering characterization of such materials is difficult and costly, which accounts for the meager property database available to designers. Thin-walled… More

The extraordinary potential of high-temperature composite materials to meet the engineering design challenges presented by advanced turbine engines and hypersonic flight vehicle airframes is well known. However, their implementation has been seriously impeded by excessive variability in materials… More

Successful development of advanced turbine engines will depend heavily upon rapid development of new, reliable, lightweight metal matrix composites (MMC's) having unprecedented high temperature properties. Recent developments in the manufacture of MMC's by vapor deposition methods offer the… More

The extraordinary potential of high-temperature composite materials to meet the engineering design challenges presented by advanced turbine engines is well known. Implementation has been seriously impeded by high cost and fabrication difficulties. Recently, continuous microcomposite monofilaments… More