Precoating alumina fibers may reduce damage in MMCs.

Advanced Materials & Processes,  February, 2000  

Tags: fiber, GPa, NASA

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Coating alumina fibers with sputtered metal has been proposed as a means to enable the fibers to retain more strength when they are incorporated into metal-matrix composites, reports NASA Glenn Research Center (formerly NASA Lewis Research Center), Cleveland, Ohio. Strength of uncoated alumina fibers in iron and iron-nickel alloy matrices is typically reduced from a strength of about 2.9 GPa (425 ksi) to 1 GPa (150 ksi).

If the fibers were stronger, then higher volumes could be incorporated into composites, making them suitable for high-temperature applications such as nozzles in the ...

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