Process for producing silicon nitride

Details Process for producing silicon nitride Process for producing silicon nitride

1988-10-26

1991-02-05

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501 98, 423344, 423406, C04B 3558

Patent

active

049904710

ABSTRACT:
A process for forming silicon nitride containing little or no silicon carbide. The process involves producing a uniform dispersion of finely divided silica particles in a polymer, heating the polymer/silica dispersion in a non-oxidizing atmosphere to carbonize the polymer, and heating the resulting carbonized product to a temperature in the range of 1300.degree.-1800.degree. C. in a non-oxidizing nitrogen-containing atmosphere. This latter heating step is carried out in the presence of a metal oxide (preferably alumina which is capable, in the reaction conditions, of reducing the amount of silicon carbide formed as an undesired by-product.

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