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Preparation method of silicon nitride powder for solar grade silicon ingot

A silicon nitride powder and solar-grade technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of complex spraying process, high cost, limited promotion and use, etc., and achieve good demoulding effect and low cost Low, eliminate the effect of falling powder

Inactive Publication Date: 2015-07-01
烟台同立高科新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can achieve good coating bonding strength, but the spraying process is complicated, high-temperature roasting treatment is required, and the cost is high, which limits the promotion and use of this method to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] ① Take silicon powder, silicon nitride powder and ammonium chloride, and synthesize silicon nitride micropowder with purity ≥99.99%, iron content 10ppm, α phase content 92%, and median particle size 5μm by self-propagating method.

[0029] Wherein, the weight of silicon powder accounts for 40% of the total weight of silicon powder, silicon nitride powder and ammonium chloride, and the weight of silicon nitride powder accounts for 50% of the total weight of silicon powder, silicon nitride powder and ammonium chloride. The weight of ammonium chloride accounts for 10% of the total weight of silicon powder, silicon nitride powder and ammonium chloride;

[0030] The purity of the silicon powder is ≥99.99%, the particle size is 0.1-25 μm, and the median particle size is 3.5 μm;

[0031] The silicon nitride powder has a purity ≥ 99.99%, an alpha phase content ≥ 90%, a particle size of 0.1-50 μm, and a median particle size of 5 μm;

[0032] The purity of the ammonium chloride ...

Embodiment 2

[0040] ① Take silicon powder, silicon nitride powder and ammonium chloride, and synthesize silicon nitride micropowder with a purity of ≥99.99%, an iron content of 8ppm, an α-phase content of 90%, and a median particle size of 5.5μm by a self-propagating method.

[0041] Wherein, the weight of silicon powder accounts for 40% of the total weight of silicon powder, silicon nitride powder and ammonium chloride, and the weight of silicon nitride powder accounts for 50% of the total weight of silicon powder, silicon nitride powder and ammonium chloride. The weight of ammonium chloride accounts for 10% of the total weight of silicon powder, silicon nitride powder and ammonium chloride;

[0042] The purity of the silicon powder is ≥99.99%, the particle size is 0.1-25 μm, and the median particle size is 4 μm;

[0043] The silicon nitride powder has a purity ≥ 99.99%, an alpha phase content ≥ 90%, a particle size of 0.1-50 μm, and a median particle size of 5 μm;

[0044]The purity of ...

Embodiment 3

[0052] ① Take silicon powder, silicon nitride powder and additives, and synthesize silicon nitride micropowder with a purity of ≥99.99%, an iron content of 7ppm, an α phase content of 92%, and a median particle size of 5.2μm by a self-propagating method.

[0053] Among them, the weight of silicon powder accounts for 40% of the total weight of silicon powder, silicon nitride powder and additives, the weight of silicon nitride powder accounts for 50% of the total weight of silicon powder, silicon nitride powder and additives, and the weight of additives accounts for , 10% of the total weight of silicon nitride powder and additives;

[0054] The purity of the silicon powder is ≥99.99%, the particle size is 0.1-25 μm, and the median particle size is 4.5 μm;

[0055] The silicon nitride powder has a purity of ≥99.99%, an α-phase content of ≥90%, a particle size of 0.1-50 μm, and a median particle size of 6 μm;

[0056] The additive is a mixture of ammonium chloride and ammonium fl...

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Abstract

The invention relates to a preparation method of silicon nitride powder for a solar grade silicon ingot. The preparation method comprises the following steps: preparing silica powder, a diluent and additives and synthesizing silicon nitride powder; mixing the silicon nitride powder, a water-soluble organic additive and a solid organic silicon defoaming agent uniformly; and grinding and grading to obtain non-sintered silicon nitride powder with high bonding strength. According to the preparation method, the preparation process of the silicon nitride powder is simple and the non-sintered silicon nitride powder with high bonding strength can be prepared in a large batch at one time; therefore, the preparation method is suitable for large-scale production; in addition, a complicated slurry preparation process is not needed when the powder is sprayed; the powder can be sprayed just according to a conventional spraying process; the problems of powder falling off, adhesion to a pot and ingot cracking in the spraying process can be solved; the spraying process is simplified; and the production cycle of a crucible coating is shortened.

Description

technical field [0001] The invention relates to a method for preparing silicon nitride powder for solar-grade polysilicon ingot casting, and belongs to the technical field of inorganic non-metallic materials. Background technique [0002] Polysilicon ingot is the pre-process of polysilicon wafers, and its technological level determines the quality of solar-grade polysilicon wafers. At present, the directional solidification method has become the main method for preparing solar-grade polysilicon ingots with the advantages of low cost, high efficiency, and the ability to purify silicon ingots. The process is: after the silicon material is put into the polysilicon ingot furnace, it is preheated, melted, grown, and annealed. , Cooling in five stages and solidifying into a polysilicon ingot with a fixed shape. The crucible used for ingot casting is quartz crucible, the main chemical composition is SiO 2 , when used alone SiO 2 In direct contact with Si, a chemical reaction wil...

Claims

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Application Information

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IPC IPC(8): C01B21/068
Inventor 郭大为吕东谭小英陆宇李佼洋
Owner 烟台同立高科新材料股份有限公司
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