Preparation of boron nitride fibers with the use of hydrated cellulose. I.Decomposition of hydrated cellulose impregnated with boron-containing compounds

The decomposition of hydrated cellulose impregnated with boric acid or ammo nium tetraborate was studied using differential thermal, mass spectroscopic X-ray diffraction, and chemical analysis, as well as electron microscopy. The temperature range of decomposition, compositions of the solid and gaseo us decomposition products, and structure of the carbon fibers produced were determined It was established that impregnation with boron-containing comp ounds shifts the decomposition of hydrated cellulose to higher temperatures but has no effect on the dehydration process.