Process of making amorphous silicon nitride powder

Details Process of making amorphous silicon nitride powder Process of making amorphous silicon nitride powder

1988-06-15

1989-08-22

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 40, 501 98, 423344, 423409, C04B 3558

Patent

active

048596396

ABSTRACT:
In amorphous silicon nitride powder, from 0.5 to 40 mol % of the silicon are replaced by one or more of the elements boron, aluminum, yttrium, lanthanum, titanium, zirconium, tungsten and molybdenum.
The powder is obtained by reacting the halides of the corresponding elements, which are dissolved in an inert organic solvent in the particular ratio desired, with ammonia. The solid reaction product formed is separated off from the liquid phase and treated at from 800.degree. to 100.degree. C.
The powder is particularly suitable as a starting material for the production of sintered articles.

REFERENCES:
patent: 4145224 (1979-03-01), Mehalchick et al.
patent: 4196178 (1980-04-01), Iwai et al.
patent: 4517168 (1985-05-01), Kawahito et al.
patent: 4734234 (1988-03-01), Sterzel

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