Patent ID: 6103178
Filing Date: 2000-08-15
Classification: C03C,C04B,C08G,C08L,Y10S

Abstract:
A method for preparing ceramic fibers comprising:i) shaping into green fibers a blend comprising:a) 90 to 99.9 weight percent of a siloxane resin comprising units with a general formula R.sub.x R.sup.1.sub.y R.sup.2.sub.z SiO.sub.(4-x-y-z)/2, wherein each R is independently selected from unsaturated monovalent hydrocarbon groups, each R.sup.1 is independently selected from aryl groups of 6 to about 10 carbon atoms, and each R.sup.2 is independently selected from saturated monovalent hydrocarbon groups, x has a value of 1 or 2, y has a value of 0, 1, or 2, and z has a value of 0, 1, or 2 with the proviso that x+y+z=1, 2, or 3, andb) 0.1 to 10 weight percent of a carborane-siloxane oligomer having the formula ##STR6## where R.sup.3 is selected from the group consisting of a hydroxyl group, an alkyl group having from 1 to 4 carbon atoms, an alkenyl group having from 1 to 4 carbon atoms, and a vinyl carborane group having the formula ##STR7## x is has a value of 10, 7, or 5; and q has a value of 1 or 2; ii) curing the green fibers to cured fibers; andiii) pyrolyzing the cured fibers to ceramic fibers by heating to a temperature of 800 to 2,200.degree. C.