C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
49/57
C03B 37/014 (2006.01) C03B 20/00 (2006.01) F27B 5/10 (2006.01) F27B 17/00 (2006.01) F27D 1/00 (2006.01)
Patent
CA 1323193
- 1 - Abstract: A furnace for heating a porous preform of fine particles of quartz base glass for making an optical fiber in an atmosphere containing fluorine to add fluorine to the preform and to vitrify the preform to produce the glass preform. The furnace has a heater and a muffle tube positioned inside the heater to separate the heating atmosphere from the heater. The invention is characterized in that at least an inner layer of the muffle tube consists of highly pure carbon. As a result, the life of the muffle tube is significantly lengthened.
572413
Ishiguro Yoichi
Kyoto Michihisa
Tsuchiya Ichiro
Kirby Eades Gale Baker
Sumitomo Electric Industries Ltd.
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