Abstract
Boron-nitride (BN) fiber has been fabricated by utilizing the preceramic method. A melt-processable polymer precursor, poly(aminoborazinyl), was readily prepared by thermal condensation of B,B,B-tri(methylamino)borazine (MAB) in the presence of 10 wt% of 1-aminododecane (LA). It was melt-spun into thin fiber with an ordinary ram extruder. The spinnability of the fiber was excellent, in spite of the low molecular weight ( c. 570) of the precursor, because it has a structural similarity with melt-spinnable carbon pitch. On spinning the fiber surface was slightly hydrolyzed in atmosphere and the fiber became infusible. The fiber was then directly pyrolyzed up to 1000°C in an ammonia gas flow and was further sintered up to 1800°C in a nitrogen flow. The strength of the sintered BN fiber was found to increase above 1400°C and to reach 1 GPa at 1800°C. It was therefore confirmed that the BN fiber is free from the serious degradation above 1400°C in inert atmosphere where most of the common ceramic fibers are known to lose their original strength.
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