| 摘要 |
<p>Process 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 (11) is centrifugally spun (13) into strands and attenuated by an annular gas stream into fibers which are compacted (35) at a controlled relative humidity into a batt and heated in an anhydrous ammonia atmosphere (14) 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 (38). The slurry is processed through a Fourdrinier machine (45) to form a felt; and, the felt is calendered by passing it through the nip of a pair of calender rolls (59) 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. </p> |
