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Preparation method of quartz ceramic crucible

A technology of quartz ceramics and crucibles, applied in crucible furnaces, glass manufacturing equipment, chemical instruments and methods, etc., can solve the problem of high impurity content of polycrystalline silicon ingots, and achieve the effect of simple and efficient preparation process

Active Publication Date: 2013-04-03
JIANGSU PACIFIC QUARTZ
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Problems solved by technology

[0005] The present invention aims to solve the problem in the prior art that impurities in the crucible diffuse to the polysilicon ingot during the preparation process of the polysilicon ingot, resulting in high impurity content in the final polysilicon ingot, and provides a method for preparing a high-purity quartz ceramic crucible with few impurities

Method used

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  • Preparation method of quartz ceramic crucible

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Embodiment 1

[0016] Embodiment 1 prepares quartz ceramic crucible

[0017] Even the furnace (such as figure 1 shown) is an existing device, which is fixed by a support base, which includes a furnace body and a furnace cover that cooperate with each other. A tungsten crucible (or molybdenum crucible) is arranged in the furnace body, and a connection electrode is arranged on the outside of the tungsten crucible (or molybdenum crucible). Heating net and heat preservation sand, the upper end of the tungsten crucible (or molybdenum crucible) is connected with a feeding device, and the lower end is connected with a forming device, which is controlled by a tractor.

[0018] The quartz sand whose diameter is less than 2mm and whose content of Fe, Na and K are all less than 5ppm is continuously added into the tungsten crucible (or molybdenum crucible) through the feeding device, heated to 1900~2400°C and maintained, so that the quartz sand Fully melt, and use high-purity hydrogen or nitrogen as a ...

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Abstract

The invention discloses a preparation method of a quartz ceramic crucible. The method comprises the steps of: adding quartz sand to a continuous melting furnace, heating to 1900-2400 DEG C so as to ensure that the quartz sand is fully molten; continuously discharging and drawing to obtain quartz glass via a shaping device of the continuous melting furnace, wherein the diameter of the quartz sand is smaller than 2mm, and all the contents of Fe, Na and K in the quartz sand are smaller than 5ppm; and then preparing the quartz ceramic crucible through a slip casting process by adopting the quartz glass as the raw material. The quartz ceramic crucible obtained through the preparation method disclosed by the invention is a high-purity quartz ceramic crucible with few impurities, and the whole preparation is simple and convenient and is suitable for industrialized production.

Description

technical field [0001] The invention relates to the field of polycrystalline silicon ingots, in particular to a method for preparing a quartz ceramic crucible. Background technique [0002] For polysilicon cell materials, minority carrier lifetime (or diffusion length) is an important parameter to measure material performance. Cast polysilicon generally has a high density of defects and a high concentration of impurities. Usually, these impurity atoms themselves or interact with crystallographic defects will become the recombination centers of minority carriers, which will greatly reduce the lifetime of minority carriers and affect the conversion efficiency of solar cells. Studies have shown that impurity elements have a greater impact on the minority carrier lifetime in silicon ingots than grain boundaries and dislocations. Therefore, reducing the content of impurity elements in the crucible is conducive to the production of high-quality cast polycrystalline silicon ingot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B20/00C30B11/00C30B35/00F27B14/10
Inventor 陈培荣陈士斌丁炳华段井超张东
Owner JIANGSU PACIFIC QUARTZ
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