Pyrolytic boron nitride container, and manufacture thereof

Details Pyrolytic boron nitride container, and manufacture thereof Pyrolytic boron nitride container, and manufacture thereof

1997-07-28

1999-07-20

Nold, Charles

Stock material or miscellaneous articles

Hollow or container type article

Glass, ceramic, or sintered, fused, fired, or calcined metal...

428 344, 428698, 428704, 264 81, 4272552, B01L 304

Patent

active

059254297

ABSTRACT:
There is disclosed a pyrolytic boron nitride container used for a Boat method in which material melt is retained In the container, and a crystal is grown while a temperature gradient is imparted to the material melt. The transmissivity of the pyrolytic boron nitride container with respect to light at a wave number ranging from 3700 cm.sup.-1 to 6500 cm.sup.-1 has a profile such that the transmissivity monotonously changes in the longitudinal direction of the container. The transmissivity profile is produced by imparting a pressure profile during manufacture of the container through deposition of pyrolytic boron nitride, by roughing the outer surface of the container such that the surface roughness has a profile, or by compounding pyrolytic boron nitride with a different material. It becomes possible to facilitate generation of a temperature gradient in material melt within the container and to facilitate control of a temperature profile in the container.

REFERENCES:
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patent: 4913652 (1990-04-01), Tanji et al.
patent: 5239612 (1993-08-01), Morris
patent: 5607775 (1997-03-01), Kimura et al.
patent: 5759646 (1998-06-01), Kano et al.
"Research Report", Inorganic Material Research Laboratory, No. 27, p. 26.
"Electronic Materials," vol. 13, No. 1, pp. 32 to 37.
D.N. Bose and H.K. Henisch, (Journal of the American Ceramic Society) "Thermoluminescence in Boron Nitride Powders" vol. 53, pp. 281-282, May 1970.

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