Process for manufacturing boron nitride fiber batts using a spin

Details Process for manufacturing boron nitride fiber batts using a spin Process for manufacturing boron nitride fiber batts using a spin

1980-03-28

1982-01-05

Lindsay, Jr., Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 2, 65 8, 65 32, 264 8, 423490, 428366, 65 301, 65 43, C03B 3704

Patent

active

043092039

ABSTRACT:
A process is disclosed for producing non-woven, yet internally cohesive, boron nitride fiber batts, suitable for use as an electric cell separator in a lithium-sulfide battery. Molten boron oxide is centrifugally spun into strands and attenuated by an annular gas stream into fibers at a controlled relative humidity. The fibers are funnelled into a chamber and subjected to a turbulent air flow, which causes random orientation and intertwining of the fibers, resulting in multiple mechanical bonds thereamong. The compacted boron oxide fiber bundle thus produced is heated in an anhydrous ammonia atmosphere to convert boron oxide in the fibers into boron nitride (BN).

REFERENCES:
patent: 3429722 (1969-02-01), Economy et al.
patent: 3668059 (1972-06-01), Economy et al.
patent: 4058386 (1977-11-01), Faulkner et al.

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