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Insulation system for polycrystalline silicon ingot furnace

A polysilicon ingot furnace and heat preservation system technology, which is applied in the directions of polycrystalline material growth, crystal growth, single crystal growth, etc., can solve the problems of high cost and large ingot thermal stress, so as to improve product quality, save energy and increase productivity Effect

Inactive Publication Date: 2010-03-03
NAN AN SANJING SOLAR POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of high cost and easy thermal stress when used in large-scale ingots in the heat preservation system in the background technology, and provide a low-cost heat preservation system suitable for large-scale polysilicon ingot furnaces

Method used

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  • Insulation system for polycrystalline silicon ingot furnace

Examples

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Embodiment 1

[0018] Embodiment 1. A 275 kg polysilicon ingot was melted using a hard graphite carbon felt material. After 50 hours, the total power consumption was 4000 degrees. Using the heat preservation system of the present invention, smelting 275kg polysilicon ingots takes 70 hours and consumes 3000 degrees of electricity in total. No internal stress relief treatment is done before subsequent slicing. 8,000 qualified silicon wafers are cut with hard graphite carbon felt material, and 9,000 qualified silicon wafers can be cut with this thermal insulation system.

Embodiment 2

[0019] Embodiment 2. Using hard graphite carbon felt material, smelting 450kg polysilicon ingot, after 90 hours, a total power consumption of 8000 degrees. Using this heat preservation system, smelting 450kg polysilicon ingots took 120 hours and consumed a total of 5000 degrees of electricity. No internal stress relief treatment is done before the subsequent slicing. 16,000 qualified silicon wafers are cut with hard graphite carbon felt material, and 18,000 qualified silicon wafers can be cut with this heat preservation system.

Embodiment 3

[0020] Example 3. Using this heat preservation system, 800 kg of polysilicon ingots were melted for 240 hours, with a total power consumption of 6500 kWh.

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Abstract

The invention relates to an insulation system for a polycrystalline silicon ingot, comprising a furnace body. A metal frame is arranged on the periphery inside the furnace body; the lateral wall of the metal frame is provided with a lateral mullite fiber board; the top part of the metal frame is provided with a top mullite fiber board; the bottom of a graphite plate under a crucible is provided with a bottom mullite fiber plate; a closed space is formed by the mullite fiber plates which are positioned on the bottom of the graphite plate, in the lateral wall of the metal frame and on the top ofthe metal frame respectively; a layer of a corundum mullite burning plate is arranged inside of the lateral mullite fiber plate close to the center of the furnace center. The insulation system can reduce electric energy consumption in a process for casting the polycrystalline silicon, reduces thermal stress of the silicon ingot and improves yield of slices when large silicon ingots are cast, andis particularly suitable for producing polycrystalline silicon ingots over 450kgs.

Description

technical field [0001] The invention relates to a furnace body heat preservation system, in particular to a polysilicon ingot furnace heat preservation system. Background technique [0002] At present, the mainstream product of polysilicon ingots in the market is 275kg polysilicon ingots, accounting for 60-80% of the market. Another mainstream product is 450kg polysilicon ingots. The market development trend is to develop towards 450kg polysilicon ingots, and 800kg Grade and above polysilicon ingots are also in the research and development stage. A significant problem with large ingots is thermal stress. Since the nature of silicon is thermal contraction and cold expansion, the larger the ingot, the more difficult it is to control the uniformity of cooling, and the concentration of internal stress directly affects the yield of slices. [0003] The insulation materials of existing polysilicon ingot casting furnaces are all hard graphite carbon felt materials, which are expe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B28/06C30B29/06C01B33/021
Inventor 马殿军郑智雄张伟娜南毅王致绪徐诗双洪朝海程香
Owner NAN AN SANJING SOLAR POWER
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