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Manufacture method of spray-free fused quartz crucible used for polycrystalline silicon cast ingots

A technology of fused silica and a manufacturing method, applied in manufacturing tools, glass manufacturing equipment, glass molding, etc., can solve the problems of long production cycle and high energy consumption, and achieve the goal of improving utilization rate, simplifying process flow, and simplifying production process. Effect

Active Publication Date: 2013-01-23
江苏润弛太阳能材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also a small number of spray-free quartz crucibles on the market, but this is just to continue spraying and sintering after the crucible is produced, the process has not changed, and this process has a long production cycle and consumes a lot of energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix 250kg of massive high-purity fused silica raw materials with a particle size of 50-60 mm and 750 kg of granular high-purity fused quartz raw materials with a particle size of 10-20 mm (mass components of massive and granular high-purity fused quartz raw materials: silicon dioxide> 99.9%, alumina<2000ppm, iron oxide<50ppm, sodium oxide<50ppm, and other components are unavoidable impurities in raw materials; the same below), put into the ball mill and add 250kg of water for wet grinding, and the slurry after grinding The particle size is controlled between 10 μm and 30 μm.

[0027] Export the slurry to the ball mill and stir for 120 hours to check the physical and chemical properties of the slurry; then add 673kg of dry powder (100 mesh powdery high-purity fused silica raw material) to fully stir; after stirring evenly, transfer it to the pouring tank and inject it into the plaster mold In the mold, after standing in the mold for 10 hours, demoulding is carried out. ...

Embodiment 2

[0036] Put 300kg of massive high-purity fused silica raw materials with a particle size of 40-50mm and 700kg of granular high-purity fused silica raw materials with a particle size of 10-15mm, put them into a ball mill and add 250kg of water for wet grinding, and the slurry particles after grinding The diameter is controlled between 10 μm and 50 μm.

[0037] Export the slurry to the ball mill and stir for 168 hours to check the physical and chemical properties of the slurry; then add 680kg of dry powder (100 mesh powdery high-purity fused silica raw material) to fully stir; after stirring evenly, transfer it to a pouring tank and inject it into a plaster mold In the mold, demould after standing in the mold for 15 hours.

[0038] The crucible blank after demoulding is dried, and the drying temperature is controlled at 100°C.

[0039] Bottom grinding is carried out on the dried blank, and the grinding time is 15 minutes.

[0040] Clean the polished inner surface of the crucibl...

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Abstract

The present invention discloses a manufacture method of a spray-free fused quartz crucible used for polycrystalline silicon cast ingots, which comprises the following steps of: firstly performing ball milling on high-purity fused quartz raw materials for wet granulating, sufficiently stirring a slurry material, then adding the powdered high-purity fused quartz raw materials, uniformly mixing, then injecting into a plaster mold for fully dewatering and molding, and demolding; drying the demoulded green body at the temperature of below 180 DEG C to obtain a blank; polishing and cleaning the blank for pretreatment; performing spray coating on a silicon nitride coating with thickness of 0.2-0.7 mm on the inner surface of the blank; and sintering the blank with the spray-coated silicon nitridecoating in a shuttle kiln at the temperature of 1000-1300 DEG C for 14-24 hours. Compared with the prior art, the manufacture method provided by the present invention shortens the production period, simplifies the production process, greatly lowers energy consumption, and improves the production efficiency, product yield and economic benefits of enterprises.

Description

technical field [0001] The invention belongs to the field of quartz crucible manufacture, and in particular relates to a method for manufacturing a spray-free fused silica crucible for polycrystalline silicon ingots. Background technique [0002] The rapid development of solar polysilicon has greatly accelerated the research and development of fused silica crucibles used in polysilicon melting ingot casting. Due to the crucible yield problem in the industry, most of the quartz crucibles currently produced are uncoated. Users must prepare their own spraying equipment when using this crucible, and spray a layer of silicon nitride coating inside the finished crucible, and then Sintering above 1000°C for more than 24 hours can be filled with pure silicon material for use. There are also a small number of spray-free quartz crucibles on the market, but this is just to continue spraying and sintering after the crucible is produced, the process has not changed, and this process has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B20/00
CPCC03B19/066Y02P40/57
Inventor 方清
Owner 江苏润弛太阳能材料科技有限公司