REINFORCEMENT OF NICKEL CHROMIUM ALLOYS WITH SAPPHIRE WHISKERS.
Final rept., 28 Sep 62-27 Sep 63,
HORIZONS INC CLEVELAND OHIO
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It was found that a strong bond between alphaalumina wool and iron may be formed by the addition of oxygen to the metal-fibril system in the form of naturally-occurring oxides of iron. Addition of oxygen through the furnace atmosphere was not found to be a practical method. Excess oxygen may be removed from the metalalumina wool composite by the addition of aluminum metal. Failure to remove excess oxygen results in degradation of the bond upon continued heating. The development of metal oxides on fiber surfaces and on sapphire plaques, followed by reduction in situ was not found to result in the wetting of sapphire by the subject metals. Nickel cladding of alumina fibers was not found to yield a strong bond. Evidences of wetting of alumina fibers with iron was seen when small amounts of iron oxide have been reacted with the fiber surfaces. Author