Manufacture of quartz glass crucible for use in the manufacture

Details Manufacture of quartz glass crucible for use in the manufacture Manufacture of quartz glass crucible for use in the manufacture

1991-06-19

1992-12-29

Lindsay, Robert L.

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

65 608, 65 71, 65144, 65900, C03C 2504, C03B 1909, C03B 2000

Patent

active

051748010

ABSTRACT:
A quartz glass crucible for use in a process for pulling a single crystal silicon and having an outer layer and an inner layer. The outer layer contains less than 0.3 ppm each of Na, K and Li and more thant 5 ppm of Al. The outer layer further contains bubbles to present an opaque appearance. The inner layer is made by melting powders of high purity non-crystalline synthetic silica and contains less then 200 ppm of OH group. There is also disclosed a method for producing the crucible.

REFERENCES:
patent: 4528163 (1985-07-01), Albrecht
patent: 4632686 (1986-12-01), Brown
patent: 4713104 (1987-12-01), Brown
patent: 4935046 (1990-06-01), Uchikawa
patent: 4956208 (1990-09-01), Uchikawa et al.

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