High-temperature resistant boron nitride-based coatings for specialty silica optical fibers
Résumé
h-BN is well known for its thermal stability. h-BN coated silica optical fibers were manufactured. The coating solution is compatible with optical fiber drawing process, which allows the preparation of tens of meter of h-BN coated fibers. In addition, it is possible to use this coating material for the preparation of short length fiber samples in a post-production approach. Bentonite acts as a binder and allows the adhesion of h-BN to the silica optical fiber. The thermal stability of this protected optical fiber has been demonstrated over a short period of time (several hours) up to 900°C and over a long period of time (1500 h) up to 800°C in air. Moreover, the coated optical fiber can resist up to 1000°C in neutral atmosphere (tested over 6 h).
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