Extruding reduced viscosity silica into green body,...

Details Extruding reduced viscosity silica into green body,... Extruding reduced viscosity silica into green body,...

C - Chemistry, Metallurgy

03

B

204/91, 49/78.1

C03B 8/00 (2006.01) C03B 17/04 (2006.01) C03B 19/12 (2006.01) C03B 20/00 (2006.01) C03B 37/012 (2006.01) C03B 37/016 (2006.01)

Patent

CA 1279289

ABSTRACT A method for manufacturing a glass body is described. A mechanical force is applied to a gel formed from a thixotropic suspension of SiO2 particles to reduce the viscosity of the gel. The gel is forced while it is in this reduced viscosity state through a die to form an extruded green body. The green body is then purified and sintered to form a glass body. The apparatus preferably includes an extruding press provided with a ram in the form of a sonotrode of a sonic or ultrasonic generator with a pressure p in the range from 1 to 7.105 Pa and with an oscillation amplitude of the sonotrode in the range from 0 to 60 µm.

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