Accession Number : AD0912407

Title :   Exploratory Development on Formation of High Strength, High Modulus Boron Nitride Continuous Filament Yarns.

Descriptive Note : Final technical management rept. 1 Mar 72-28 Feb 73,

Corporate Author : CARBORUNDUM CO NIAGARA FALLS NY

Personal Author(s) : Lin, Ruey Yuan ; Economy, James ; Murty, Hari N.

Report Date : JUL 1973

Pagination or Media Count : 61

Abstract : This report summarizes the second year's 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)

Descriptors :   (*BORON COMPOUNDS, SYNTHETIC FIBERS), (*SYNTHETIC FIBERS, NITRIDES), TENSILE PROPERTIES, MODULUS OF ELASTICITY, MANUFACTURING, PRODUCTION, OXIDES, CHEMICAL ANALYSIS, STRETCH FORMING, TEMPERATURE, VISUAL INSPECTION, X RAY DIFFRACTION, MECHANICAL PROPERTIES, ELECTRON DIFFRACTION.

Subject Categories : Inorganic Chemistry
      Textiles

Distribution Statement : APPROVED FOR PUBLIC RELEASE