Exploratory Development on Formation of High Strength, High Modulus Boron Nitride Continuous Filament Yarns.
Final technical management rept. 1 Mar 72-28 Feb 73,
CARBORUNDUM CO NIAGARA FALLS NY
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This report summarizes the second years effort on Exploratory Develop-ment on Formation of High Strength, High Modulus Boron Nitride Continuous Filament Yarns. Major efforts were concentrated on developing facilities needed for larger scale production. These in-cluded construction of a 1000 tip bushing, installation of continuous nitriding furnace and acquisition of an improved tension device. A large amount of effort was devoted to installing and putting into operation the 1000 tip bushing. The possibility of continuously nitriding the boric oxide filament yarn to a proper degree of nitriding was demonstrated. In addition, the feasibility of producing continuous boron nitride filament with an average tensile strength and modulus of 236,000 psi max. 341,000 psi and 33,800,000 psi max. 44,600,000 psi was also demonstrated. These values represent the highest average tensile strength ever observed for boron nitride fibers. Author-PL
- Inorganic Chemistry