Monocrystalline ceramic fibers and method of preparing same

Details Monocrystalline ceramic fibers and method of preparing same Monocrystalline ceramic fibers and method of preparing same

1990-11-16

1993-04-06

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

1566161, 1566162, 156DIG112, 427 62, 4271262, 4271265, 427255, 505704, 505740, 505 1, C04B 3502, H01B 1200, C30B 1300

Patent

active

052003701

ABSTRACT:
Monocrystalline ceramic fibers are disclosed together with a process for preparing such fibers. Polycrystalline ceramic fibers in a tow are coated with a coating that is chemically substantially non-reactive with the ceramic (e.g. alumina fibers coated with molybdenum), and the coated fibers are drawn through a heating zone maintained at a temperature high enough to melt the fibers without melting the coating. The coated fibers are withdrawn from the heating zone and cooled rapidly enough to form a substantially monocrystalline ceramic. The protective coating may thereafter be removed to leave a tow of substantially single-crystal ceramic fibers. Monocrystalline ceramic fibers about 8-20 microns in diameter are prepared by the disclosed process.

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