Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1977-06-07
1981-06-30
Smith, William F.
Glass manufacturing
Processes
Forming product or preform from molten glass
65157, 65169, 264 81, 427163, 427167, 427237, C03B 3701
Patent
active
042760720
ABSTRACT:
High purity glass preforms for optical fiber manufacture are provided by depositing, using chemical vapor deposition techniques, high purity materials upon a removable hollow tubular deposition substrate of a radio frequency energy susceptible material. The substrate is subjected to radio frequency energy for the purposes of heating the substrate and the high purity glass-forming materials in vapor form are passed through the hollow substrate so that the heated substrate causes a reaction resulting in the deposition of the high purity materials on the inner surface of the substrate. The hollow tubular substrate is subsequently removed from the high purity glass materials to provide a cylinder of high purity glass. During the processing, the hollow substrate functions as a substrate, radio frequency energy susceptor and reaction enclosure. One embodiment of the invention contemplates that the substrate and the high purity glass materials will have different coefficients of thermal expansion so that after deposition of the glass-forming materials, the materials and the substrate may be simultaneously cooled by an amount sufficient to cause the substrate to break and fall away from the deposited glass-forming materials, leaving a cylinder of high purity material.
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International Telephone and Telegraph Corporation
O'Halloran John T.
Smith William F.
Van Der Sluys Peter C.
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