Preparation of boron-doped silicon carbide fibers

Details Preparation of boron-doped silicon carbide fibers Preparation of boron-doped silicon carbide fibers

1997-08-20

1998-12-22

Marcheschi, Michael

Compositions: ceramic

Ceramic compositions

Refractory

501 88, 423345, 264DIG19, C04B 35565, C04B 3552

Patent

active

058519424

ABSTRACT:
A method of preparing polymer derived silicon fibers comprising the steps of providing a spin dope solution comprising a silicon carbide forming organosilicon polymer, preferably polycarbosilane, a solvent, a soluble boron precursor, preferably solid boron hydride, and a nitrogen containing precursor, preferably polyvinylsilazane; spinning the solution to form high strength green fibers; and heat treating the green fibers to produce high strength, homogeneously doped, boron containing fibers. The fibers produced are high strength, homogeneously boron doped silicon carbide fibers with average tensile strength in the range of from about 2.0 to 4.0 GPa at room temperature.

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