Fabrication of refractory insulating materials consisting essent

Details Fabrication of refractory insulating materials consisting essent Fabrication of refractory insulating materials consisting essent

1986-07-28

1988-09-06

Capella, Steven

Compositions: ceramic

Ceramic compositions

Pore-forming

501 90, 501 97, 501 99, 4283139, 4283155, 428404, 428406, 523325, 523218, 264 60, 264DIG6, 264 291, 264 293, C04B 3800, C04B 3554, C04B 3556, C04B 3558

Patent

active

047693487

ABSTRACT:
A process for fabrication of refractory insulating materials wherein essentially pure silica shells are mixed with a polymeric graphite precursor dissolved in a solvent. The resulting slurry is placed in a forming mold, and the solvent is evaporated to form a polymeric matrix containing the shells as a dispersion. This matrix is pyrolized under an inert or reducing atmosphere to decompose the polymer and form a first product consisting essentially of a carbon matrix containing a dispersion of silica shells. To enhance refractory characteristics, such first product is fired at high temperature in an inert or reducing atmosphere to form a second product consisting of a carbon matrix containing a dispersion of SiC-lined voids, or in a nitrogen atmosphere to form a third product consisting of the carbon matrix containing a dispersion of Si.sub.3 N.sub.4 -lined voids.

REFERENCES:
patent: H200 (1987-01-01), Chen
patent: 3256105 (1966-06-01), Alford
patent: 3810963 (1974-05-01), Benton et al.
patent: 3832426 (1974-08-01), Malthouse et al.
patent: 3969124 (1976-07-01), Stewart
patent: 4077921 (1978-03-01), Sharpe et al.
patent: 4481179 (1984-11-01), Wei
patent: 4619905 (1986-10-01), Natausohn et al.

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