Bell of translucent fused silica for the precipitation of polysi

Details Bell of translucent fused silica for the precipitation of polysi Bell of translucent fused silica for the precipitation of polysi

1981-12-17

1983-08-09

Vertiz, O. R.

Stock material or miscellaneous articles

Hollow or container type article

Cellular material derived from plant or animal source

428156, 428428, 4285428, 422102, 422240, B65D 100

Patent

active

043978975

ABSTRACT:
Bell of translucent fused silica having an inner layer of transparent fused silica for the precipitation of polysilicon. The thickness of the transparent fused silica layer increases continuously towards the open end of the bell while the total wall thickness of the bell is kept constant. The thickness increase of the transparent fused silica layer begins preferably beyond the center of the total length of the bell. The thickness of the transparent fused silica layer increases by at least half of the thickness which it has in the top part of the bell.

REFERENCES:
patent: 3882901 (1975-05-01), Seller et al.
patent: 3927697 (1975-12-01), Baumler et al.
patent: 3962515 (1976-06-01), Dumbaugh, Jr. et al.
Technical Bulletin Q-B 3/113, "Quartz glass for the Semi-Conductor Technology", published by Heraeus Quartzschmelze GmbH, Hanau, West Germany, Sep. 1979.

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