Method and apparatus for producing sapphire tubes

Details Method and apparatus for producing sapphire tubes Method and apparatus for producing sapphire tubes

1980-11-12

1982-04-20

Sever, Frank

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Including specific material of construction

156608, 156617SP, B01J 1718

Patent

active

043259170

ABSTRACT:
During the process of pulling sapphire tubes from a melt with the aid of a seed, the longitudinal temperature gradient in the zone between the solidified front and the region of pulling where the temperature is between 1850 and 1900 deg. C is maintained not in excess of 30 deg. C/cm. The tube so grown is annealed at a temperature between 1950 and 2000 deg. C by increasing the temperature at a rate of 30 to 40 deg. C/min and keeping the tube at said temperature during a period between 3 and 4 hours. After that the tube is cooled down to room temperature at a rate of 30-40 deg. C/min.
Disclosed is also an apparatus which enables said temperature gradient to be maintained while pulling the tube.

REFERENCES:
patent: 3026210 (1962-03-01), Coble
patent: 3868228 (1975-02-01), Mlavsky et al.
patent: 3953174 (1976-04-01), LaBelle
patent: 4184907 (1980-01-01), Yates

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