Firing process for alumina yarn

Details Firing process for alumina yarn Firing process for alumina yarn

1975-02-19

1976-04-27

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

106 62, 106 65, 264 56, 264 63, 264 64, 264DIG19, F27B 914

Patent

active

039535614

ABSTRACT:
Process for producing continuous alumina multifilament yarns which comprises preparing an aqueous spinning mix containing selected alumina particles and water-soluble precursors of alumina in selected amounts, spinning filaments from the mix, forming a continuous filament package on a collapsible, refractory bobbin at a windup speed which attenuates the filaments, firing the package in a furnace at selected temperatures in either one or two steps, and then firing the yarn while backwinding it. A bobbin is obtained which is wound with strong substantially straight yarn of at least five aligned polycrystalline .alpha.-alumina continuous filaments, which yarn can be backwound from the bobbin.

REFERENCES:
patent: 3108888 (1963-10-01), Bugash
patent: 3180741 (1963-10-01), Wainer
patent: 3271173 (1966-09-01), Lockhart et al.
patent: 3311481 (1967-03-01), Sterry
patent: 3311689 (1967-03-01), Kelsey
patent: 3560408 (1971-02-01), Kiehl et al.
patent: 3595946 (1971-07-01), Joo et al.
patent: 3705223 (1972-12-01), Pearson et al.

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