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Silicon electromagnetic casting device

A technology of electromagnetic casting and structure, applied in the direction of silicon compounds, inorganic chemistry, non-metallic elements, etc., can solve problems such as infiltration, and achieve the effect of preventing deformation and protecting crucibles

Active Publication Date: 2010-09-15
丽达科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Yet there is following problem obviously in above-mentioned silicon electromagnetic casting method: the continuous decline solidification crystallization of silicon ingot, as figure 1 As shown, a small amount of molten silicon infiltrates into the tiny gap between the silicon ingot and the crucible at the contact interface between the crucible, molten silicon and the silicon ingot

Method used

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Examples

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Embodiment 1

[0064] like figure 2 and image 3 As shown, a rigid structure 810 made of insulating material is embedded on the outer peripheral surface of the crucible 200, and when this silicon electromagnetic casting device is used to manufacture a silicon ingot S in the shape of a square column, the steps are as follows:

[0065] In this example, the cross section of the silicon ingot S in the casting direction is a square with a side length of 35 cm. Therefore, assuming that the cross-section in the horizontal direction is a square crucible 200 with an inner side length of 35 cm and an outer side length of 41.6 cm, the number of longitudinal insulation division regions of the crucible 200 is determined as 60, and each of the crucible 200 divided into 60 parts The length of the part is 70cm. During processing, there is cooling circulating water inside, and mica, an electrical insulating material, is inserted between each part. The flow of cooling water inside the crucible 200 is 500 l...

Embodiment 2

[0073] Figure 4 and Figure 5 In the operation example of the silicon electromagnetic casting device shown, a rigid structure 820 made of insulating material is embedded in the outer peripheral surface of the crucible 200. When using this device to manufacture a cylindrical silicon ingot S, the steps are as follows:

[0074] In this example, the silicon ingot has a circular cross-section in the casting direction with a diameter of 600 mm. Therefore, assuming that the inner diameter of the crucible 200 is 600 mm and the outer diameter is 660 mm, the number of insulating divisional regions in the longitudinal direction of the crucible 200 is set to 60. During processing, each part of the crucible 200 divided into 60 parts has cooling water circulating inside, and mica, an electrical insulating material, is inserted between each part. The flow of cooling water in the crucible 200 is 500 liters per minute in total.

[0075] In addition, an induction power supply with a maximum...

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Abstract

The invention discloses a silicon electromagnetic casting device. The device comprises a furnace body container, a crucible with conductivity arranged in the furnace body container and an induction coil arranged on the periphery of the crucible, wherein the designated gas with some pressure is filled in the furnace body container; after the induction coil in the silicon electromagnetic casting device is energized, silicon in the crucible is heated through induction, melted and then solidified; and rigid structures made of insulation material are embedded on the periphery surface of the crucible. By using the invention, when melted silicon infiltrates in small gaps between the solidified silicon ingot and the crucible and performs setting expansion to exert pressure on the internal surfaceof the crucible, the rigid structures embedded on the periphery of the crucible act to resist deformation pressure so that the outward deformation of the crucible can be avoided, the crucible can be protected and the production can continues.

Description

technical field [0001] The invention relates to a silicon electromagnetic casting device for manufacturing silicon ingots of solar cell silicon substrates. Background technique [0002] As one of the methods to improve global environmental problems, solar cells are gradually becoming popular. Silicon crystals with abundant resources and high photoelectric conversion efficiency are widely used in solar cells, and polycrystalline silicon substrate solar cells manufactured by electromagnetic casting method have a wide range of applications. Prospects. [0003] At present, the silicon electromagnetic manufacturing device is to place the raw material silicon in the copper crucible container of the furnace body. There is circulating cooling water inside the crucible, and an induction coil is set on the periphery of the crucible. Under crystallization, a silicon ingot is produced. Inside the water-cooled crucible, the raw silicon floats and melts due to the action of electromagne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/021
Inventor 金子恭二郎宋明生
Owner 丽达科技有限公司
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