Process for manufacturing boron nitride fiber mats using a needl

Details Process for manufacturing boron nitride fiber mats using a needl Process for manufacturing boron nitride fiber mats using a needl

1980-06-04

1982-10-19

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

Utilizing centrifugal force or rotating forming zone

264 57, 264 65, 264248, 264518, 264DIG19, 423290, B29C 600

Patent

active

043549861

ABSTRACT:
A process is disclosed for producing a non-woven, boron nitride fiber mat, 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 which are compacted at a controlled relative humidity into a mat. The mat of fibers passes through a needler, which repeatedly drives arrays of needles into the mat from either one or both sides, to reorient and intertwine the fibers, producing additional mechanical bonds thereamong. The needled mat then is heated in an anhydrous ammonia atmosphere to convert boron oxide in the fibers into boron nitride (BN). In an alternate embodiment the boron oxide fibers within the mat are converted into boron nitride before being passed through the needler.

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patent: 4032607 (1977-06-01), Schulz
patent: 4075276 (1978-02-01), Economy et al.
patent: 4130631 (1978-12-01), Hamilton

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