Abstract
Commercially available boron fiber was heated in ammonia with hydrogen, nitrogen with argon, and in a mixture of hydrogen, nitrogen and boron trichloride gases in an attempt to produce a nitride coating. It was found that heating the boron fiber in a mixture of ammonia and hydrogen resulted in the formation of a boron nitride coating which offers protection for boron in air and in 2024 aluminum powder in at 600°C for 1 hour. Under these same conditions untreated boron fiber is severely degraded. The results of this study indicate that the nitrided boron fibers might be used in place of boron fibers as the reinforcement in metal matrix composites where high temperature is required in the fabrication process, but long-time elevated temperature exposure is not expected.
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