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Method and device for reducing internal stress of single crystal rod

A single crystal rod, internal stress technology, applied in the direction of chemical instruments and methods, crystal growth, post-processing details, etc., can solve the problems of slice loss, waste of production time, etc., to reduce internal stress, reduce operating time, and reduce thermal stress The effect produced

Inactive Publication Date: 2010-05-26
NAN AN SANJING SOLAR POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the single crystal ingot is out of the furnace, if it is taken out when the temperature is high, due to the large temperature difference between the inside of the crystal and the outside air, internal stress is likely to occur, resulting in loss of slices; but if it is taken out when the temperature is low, it will waste production time

Method used

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  • Method and device for reducing internal stress of single crystal rod
  • Method and device for reducing internal stress of single crystal rod
  • Method and device for reducing internal stress of single crystal rod

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Embodiment Construction

[0022] refer to Figure 1 to Figure 3 , a thermal insulation device for reducing the internal stress of a single crystal ingot, including a cylinder 1 and a handcart 2, wherein the cylinder 1 includes a left half cylinder and a right half cylinder 11, and the left half cylinder consists of a left upper half cylinder 12 and a left lower half cylinder 13, the upper left half cylinder 12 and the lower left half cylinder 13 can rotate with the right half cylinder 11 through the rotating shaft 14 respectively. Figure 1 to Figure 3 Among them, the left upper half-cylinder 12 and the right half-cylinder 11 are in a half-open position with each other, and the left lower half-cylinder 13 and the right half-cylinder 11 are in a slightly open position with each other.

[0023] The cylinder is made of ordinary tinned steel pipe with a thick graphite carbon felt layer on the inner surface.

[0024] Handcart 2 comprises a flat plate 21, four rollers 22 are installed on the bottom of flat ...

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PUM

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Abstract

The invention relates to a method and a device for reducing internal stress of a single crystal rod. The method comprises the following steps of taking the single crystal rod between 200 and 300DEG C out of an oven chamber; and immediately putting the single crystal rod into a heat insulation device and naturally cooling the single crystal rod to room temperature. The device comprises a cylinder and a handcart; and the inner surface of the cylinder is provided with an insulation layer. By means of the heat insulation effect, the residual internal stress of the single crystal rod can be well removed through heat aging so as to reduce loss caused by fragments in wafering.

Description

technical field [0001] The invention relates to a method and a device for reducing the internal stress of a single crystal rod. Background technique [0002] When the single crystal is pulled, due to thermal stress, a large number of dislocations will be generated at the tail, and will extend upward along the single crystal, and the length of the extension is approximately equal to one diameter. Therefore, the ending length is required to be greater than 150 mm. After stopping the heating for 6-8 hours, the furnace can be inflated and the furnace can be lifted to lift the crystal. At this time, the temperature of the single crystal rod is 200-300°C. [0003] The so-called thermal stress refers to the relative contraction or expansion of the central part of the crystal to the edge part, and its size depends on the uniform distribution of temperature in the crystal. Can be compressive or tensile. When the single crystal ingot is out of the furnace, if it is taken out at a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B33/02
Inventor 郑智雄南毅张伟娜汪健林霞胡满根
Owner NAN AN SANJING SOLAR POWER