Process for manufacturing boron nitride fiber mats

Details Process for manufacturing boron nitride fiber mats Process for manufacturing boron nitride fiber mats

1980-03-28

1982-01-05

Chin, Peter

Paper making and fiber liberation

Processes and products

Utilizing non-aqueous suspending medium

65 6, 162152, 162157R, 162181R, 162201, 162206, 162207, D21H 518, D21H 526

Patent

active

043092446

ABSTRACT:
A process is disclosed for producing a non-woven, boron nitride-bonded 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 bundle and heated in an anhydrous ammonia atmosphere to convert boron oxide in the fibers to boron nitride (BN). The BN fibers are blended with a lesser amount of boron oxide fibers and a nonaqueous liquid medium to form a slurry. The slurry is processed through a Fourdrinier machine to form a felt; and, the felt is calendered by passing it through the nip of a pair of calender rolls at an appropriate temperature and pressure to soften the boron oxide binder to fuse the BN fibers together. The interstitial boron oxide then is converted to boron nitride.

REFERENCES:
patent: 2888325 (1959-05-01), Taylor
patent: 3429722 (1969-02-01), Economy et al.
patent: 3816242 (1974-06-01), Selover et al.
patent: 3837997 (1974-09-01), Economy et al.
patent: 4075276 (1978-02-01), Economy
patent: 4125450 (1978-11-01), DeGueldre et al.
patent: 4130631 (1978-12-01), Hamilton

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