Method for producing ultra-high purity, optical quality, glass a

Details Method for producing ultra-high purity, optical quality, glass a Method for producing ultra-high purity, optical quality, glass a

1989-06-29

1990-10-09

Lindsay, Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 311, 65 181, 65 183, 65 17, 264 12, 264 15, 264 27, 501 12, C03B 37023, C03B 37016, C03B 1906

Patent

active

049617672

ABSTRACT:
A method for consolidating a green body is disclosed which involves: (1) drying and partially sintering the green body at a temperature above about 1000.degree. C. and in an atmosphere containing chlorine; (2) fully sintering the green body under vacuum at a temperature above about 1720.degree. C.; and (3) hot isostatic pressing ("hipping") the green body at a temperature above about 1150.degree. C. and at a pressure above about 100 psig. The process produces glass articles which have a low water content and are essentially bubble free.

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