Schott Glaswerke

Ewald Mo/ Rsen

Johannes Segner

Helge Vogt

A process for coating the inner surface of a greatly arched, essentially dome-shaped substrate by CVD is described wherein reaction gases, which contain layer-former molecules, are conveyed into a reaction chamber containing the substrate(s) to be coated. The reaction gases are conveyed through at least one gas inlet, placed facing the vertex of the dome at a distance from the surface to be coated. Deposition of the layer material on the substrate is brought about by producing a reaction zone on the inner surface of the substrate to be coated. The reaction gases do not, as is usual for known processes, flow slowly into the reaction chamber. Instead, for production of a uniform coating, the reaction gases are introduced at a high speed such that the product of Reynolds number, R, of the gas jet in or in the immediate vicinity of the gas inlet and the distance, h, between the gas inlet and the dome vertex is 400&lt;R.times.h[mm]&lt;4000.

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Morfelden, Germany

Ewald Mo/ Rsen