Preceramic compositions and ceramic products

Details Preceramic compositions and ceramic products Preceramic compositions and ceramic products

1989-09-18

1991-04-09

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 96, 264 63, 264 65, 264 59, C04B 3556, C04B 3558

Patent

active

050064924

ABSTRACT:
Low density silicon nitride ceramics having improved bending an specific strengths over known silicon nitride ceramics derived from silicon nitride powder and polysilazane precursors are prepared by (A) intimately mixing about 50-80% by weight of silicon nitride powder with about 15-50% by weight of perceramic polysilazane binder, (B) pulverizing the mixture to form particles having a particle size smaller than 105 micrometers, (C) separating from those particles any particles having a particle size larger than about 105 micrometers, (D) molding the resultant composition having a particle size not larger than about 105 micrometers, and (E) pyrolyzing the molded composition in an inert atmosphere to a temperature of about 1200.degree.-1450.degree. C.; said preceramic binder being at least one polysilazane prepared by reacting an organodihalosilane with ammonia, treating the ammonolysis product with a basic catalyst which is capable of deprotonating an NH group that is adjacent to an SiH group, and quenching the resultant product with an electrophilic quenching reagent.

REFERENCES:
patent: 4482669 (1984-11-01), Seyferth et al.
patent: 4543344 (1985-09-01), Cannady
patent: 4594330 (1986-06-01), Suzuki et al.
patent: 4612383 (1986-09-01), Laine et al.
patent: 4645807 (1987-02-01), Seyferth et al.
patent: 4650837 (1987-03-01), Seyferth et al.
patent: 4659850 (1987-04-01), Arai et al.
patent: 4891340 (1990-01-01), Semen et al.

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