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Method for manufacturing polycrystal blowing crucibles for cast ingots

A technology for crucibles and ingots, which is applied in the field of preparation of polycrystalline self-spraying crucibles for ingots, achieving the effects of good adsorption, non-destructive properties, and reduced energy consumption

Inactive Publication Date: 2014-07-16
NANTONG ZONGYI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] And because the surface of the ceramic crucible needs to have a certain porosity, the pores will lead to the bonding of the silicon ingot and the crucible and the penetration of crucible impurities into the silicon ingot.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for preparing a polycrystalline self-spraying crucible for casting ingots, the steps of which are:

[0019] (1) Preparation of silicon nitride slurry: silicon nitride powder with a mass fraction of 45%, polyvinyl chloride with a mass fraction of 1%, and 2,6-di-tert-butyl-4-methanol with a mass fraction of 0.3% Base phenol, mass fraction is after the pure water of 40% mixes homogeneously, is heated to 40 ° of C;

[0020] (2) Spraying: Spraying with a spray gun, the pressure of the spray gun is 20ps, the spraying distance is 25 cm, the width of the crucible is 15 cm, and the thickness of one spraying during the spraying process is controlled within less than 0.01mm, and the spraying temperature of the crucible is controlled at 40°C Within the sprayed crucible, continue to cure the coating at 80°C for 1 hour, and then cool to room temperature.

Embodiment 2

[0022] A method for preparing a polycrystalline self-spraying crucible for casting ingots, the steps of which are:

[0023] (1) Preparation of silicon nitride slurry: silicon nitride powder with a mass fraction of 55%, polyacrylic acid with a mass fraction of 5%, and 2,6-di-tert-butyl-4-methyl Phenol, mass fraction is after the pure water of 55% is mixed homogeneously, is heated to 70 ° of C;

[0024] (2) Spraying: Spraying with a spray gun, the pressure of the spray gun is 30psi, the spraying distance is 28 cm, the width of the positioning landing crucible is 17 cm, and the thickness of one spraying during the spraying process is controlled within less than 0.01mm, and the spraying temperature of the crucible is controlled at 50°C Inside, the sprayed crucible was continued to be cured at 90°C for 1.5 hours, and then cooled to room temperature.

Embodiment 3

[0026] A method for preparing a polycrystalline self-spraying crucible for casting ingots, the steps of which are:

[0027] (1) Preparation of silicon nitride slurry: silicon nitride powder with a mass fraction of 60%, sodium carboxymethyl cellulose with a mass fraction of 8%, tert-butyl hydroquinone with a mass fraction of 1.5%, mass Fraction is after the pure water of 85% mixes evenly, is heated to 100 ° C;

[0028] (2) Spraying: Spraying with a spray gun, the pressure of the spray gun is 40psi, the spraying distance is 30 cm, the width of the positioning and landing crucible is 20 cm, and the thickness of one spraying during the spraying process is controlled within less than 0.01mm, and the spraying temperature of the crucible is controlled at 65°C Inside, the sprayed crucible was continued to cure the coating at 100°C for 2 hours, and then cooled to room temperature.

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PUM

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Abstract

The invention discloses a method for manufacturing polycrystal blowing crucibles for cast ingots. The method includes the steps that silicon nitride slurry is prepared; after 45%-60% by weight of silicon nitride powder, 1%-8% by weight of organic binding agents, 0-1.5% by weight of antioxidants and 40%-85% by weight of pure water are evenly mixed, the mixture is heated to be at 40 DEG C-100 DEG C; spraying is carried out, suspension liquid is sprayed on the surfaces of the crucibles with the spraying technology, the sprayed crucibles are continuously coated at 80 DEG C-100 DEG C, solidification is carried out for 1 hour-2 hours, and then cooling is carried out to enable the temperature to reach the indoor temperature. By means of the manufacturing method, the adsorbability of the surfaces of the crucibles is good, damage is not prone to being caused, high-temperature sintering is not needed, the oxidation pollution to the quartz crucibles and coatings is reduced, and energy consumption is reduced.

Description

[0001] technical field [0002] The invention relates to a preparation method of a polycrystalline self-spraying crucible for ingot casting. Background technique [0003] Quartz ceramic crucible is a container used to load molten polysilicon raw materials in the process of polysilicon ingot casting, mostly square. There are two problems in the manufacture and use of quartz ceramic crucibles. [0004] On the one hand, when the molten polysilicon raw material is loaded, the molten polysilicon will react with the quartz ceramic crucible, that is, the silicon and the main component of the quartz ceramic crucible, SiO2, will react to form SiO and oxygen. Oxygen will pollute silicon, and SiO is volatile. And will react with graphite parts in the furnace, silicon monoxide reacts with graphite to form silicon carbide and carbon monoxide. The carbon monoxide will then react with the molten silicon to form additional volatile silicon monoxide and carbon. [0005] On the other hand,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/12B05D3/00C30B28/06
Inventor 黄涛明李俊军章勇
Owner NANTONG ZONGYI NEW MATERIAL