Optical moldings made from silicon nitride, and a process for th

Details Optical moldings made from silicon nitride, and a process for th Optical moldings made from silicon nitride, and a process for th

1993-09-27

1994-10-25

Bell, Mark L.

Coating processes

With post-treatment of coating or coating material

Heating or drying

B05D 302

Patent

active

053587464

ABSTRACT:
A process for the preparation of optical materials from silicon nitride by pyrolysis of polymeric silazanes, by pressing the pulverulent polymeric silazanes to give moldings before the pyrolysis or first dissolving the polymeric silazanes in an organic solvent, drawing fibers from this solution and pyrolyzing these fibers after evaporation of the solvent, or by melting polymeric silazanes, casting, injection-molding or extruding this melt to give moldings and subsequently pyrolyzing the moldings. An oxidic coating is produced on the silicon nitride molding in an oxygen-containing atmosphere during or after the pyrolysis. The pyrolysis can be carried out at 800.degree.-1000.degree. C. in an atmosphere containing ammonia or an ammonia/inert gas mixture.

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