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Method for obtaining liquid silicon, and crucible for achieving method

A liquid silicon and crucible technology, applied in chemical instruments and methods, crystal growth, and self-melting solvent melts, etc., can solve problems such as erosion, crucible leakage, consumption of Al, etc., and achieve increased solubility, facilitated growth, and reduced costs. Effect

Active Publication Date: 2017-03-22
SICC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, during the heating process, Al will melt first. Before the silicon is melted, Al is in a liquid state, and Al will react with the graphite crucible to form aluminum carbide, which will consume part of the Al. Give way

Method used

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  • Method for obtaining liquid silicon, and crucible for achieving method
  • Method for obtaining liquid silicon, and crucible for achieving method

Examples

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Embodiment 1

[0021] A method for obtaining liquid silicon. The specific steps are: synchronously melting a cosolvent in a crucible and automatically adding it into the liquid silicon, thereby increasing the solubility of carbon in the liquid silicon; using the temperature gradient in the crucible to promote the cosolvent and The silicon element melts simultaneously.

[0022] The co-solvent is selected from one or more of Fe, Mn, Ti, Cr, Al.

Embodiment 2

[0024] A kind of crucible, described crucible comprises crucible body 1, and described crucible body 1 is provided with three grooves 2, and described groove one end is provided with baffle plate 3; Described groove is provided with small pores 4;

[0025] The groove 2 is arranged on the inner wall of the crucible body 1; the groove 2 is spiral;

[0026] The small pores 4 are evenly placed at the bottom of the tail end of the groove 2; the three grooves are arranged in a staggered manner, and the vertical heights from the starting end to the bottom of the crucible are different.

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Abstract

The present invention relates to a method for obtaining liquid silicon, and a crucible for achieving the method. According to the method, the liquid silicon solution having the high carbon solubility is obtained by using a synchronous cosolvent melting method. The crucible for achieving the method comprises a crucible body, wherein the inner wall of the crucible body is provided with a concave groove, one end of the concave groove is provided with a baffle, and the bottom portion on the terminal end of the concave groove are uniformly provided with small fine pores. With the method and the crucible having the corresponding structure of the present invention, the problem that different melting points of the cosolvents cause the asynchronous melting during the silicon carbide preparation process can be solved, the melting interval can be shortened, the liquid silicon solution having the fixed chemical ratio can be formed, the solubility of the carbon can be improved, and the rapid growth of the crystal can be ensured.

Description

technical field [0001] The invention relates to the technical field of silicon carbide production equipment, in particular to a method for obtaining liquid silicon and a crucible for realizing the method. Background technique [0002] The existing liquid-phase method for growing silicon carbide crystals is to melt silicon in a high-purity graphite crucible by heating to form a solution of carbon in silicon, and then extend the graphite shaft with the seed crystal attached to the head into the grow in solution. Under normal pressure, the solubility of carbon in silicon solution is very low, which leads to insufficient supply of carbon and limits the growth rate of silicon carbide crystals. In order to meet the requirements of industrialization, the solubility of carbon in silicon solution must be increased. The general practice is to add co-solvents, such as Fe, Mn, Ti, Cr, etc., to the silicon solution. Especially for P-type doping, Al is widely used in liquid-phase silic...

Claims

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Application Information

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IPC IPC(8): C30B29/36C30B9/10
CPCC30B9/10C30B29/36
Inventor 朱灿李斌张亮
Owner SICC CO LTD
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