Method of producing quartz glass body

Details Method of producing quartz glass body Method of producing quartz glass body

1996-05-30

1998-06-23

Hoffmann, John

Glass manufacturing

Processes of manufacturing fibers, filaments, or preforms

Process of manufacturing optical fibers, waveguides, or...

65421, 65427, C03B 804

Patent

active

057699216

ABSTRACT:
A solid or hollow cylindrical heat-resistant substrate having a tapered shape is rotated about its axis, the degree of tapering being essentially constant along the entire length. The substrate has an outer diameter in the range of 20 mm to 500 mm and a length in the range of 500 mm to 5,000 mm. A mother material body made of porous quartz glass is formed on the outer surface of the substrate by chemical deposition, and vitrified by heating while holding it vertically with the larger outer-diameter side of the heat-resistant substrate positioned downward. Alternatively the heat-resistant substrate is extracted from the mother material body and a heat-resistant tapered body with a taper similar to that of the substrate is inserted into the hole left after extraction in the central region of the mother material body. The mother material body is vitrified starting at the lower end with the larger outer-diameter side positioned downwardly. A large-sized quartz glass rod or a large-sized quartz glass tube can be provided any of which has originally an orderly shape and which therefore can be easily machined.

REFERENCES:
patent: 4233052 (1980-11-01), Dominick
patent: 4289517 (1981-09-01), Bailey
patent: 4388094 (1983-06-01), Carpenter
patent: 4941905 (1990-07-01), Narasimham
patent: 5221308 (1993-06-01), Krohn
patent: 5352259 (1994-10-01), Oku
patent: 5658363 (1997-08-01), Ince
patent: 5665132 (1997-09-01), Ruppert

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