Method for decreasing radial temperature gradients of crystal gr

Details Method for decreasing radial temperature gradients of crystal gr Method for decreasing radial temperature gradients of crystal gr

1982-09-07

1984-10-23

Lacey, David L.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156617SP, 156DIG73, 156DIG83, 422248, 422249, 432 10, 432264, 373155, C30B 1502

Patent

active

044786760

ABSTRACT:
A method for reducing the radial temperature gradient of a radiant energy emitting heated body is described. The method comprises insulating such heated body with a refractory insulating material containing an efficient absorber of the radiant energy emitted by said heated body. Specifically, materials containing trivalent dysprosium are disclosed as suitable thermal insulation for use where the heated body is at a temperature in the 1800.degree. C.-2500.degree. C. range. Also described is a crystal growth chamber for pulling unicrystalline compositions from a melt utilizing the Czochralski technique. The chamber is characterized by the placement of a refractory insulating material containing an efficient absorber of near infrared radiation around a crucible which contains the melt. Dysprosium is specifically disclosed as an efficient absorber of the near infrared radiation which is emitted by melt and crucible at the elevated temperatures employed for boule formation utilizing the Czochralski technique.

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patent: 4249988 (1981-02-01), Lavigna et al.
patent: 4315832 (1982-02-01), Pastor et al.
patent: 4378269 (1983-03-01), Matsushita et al.

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