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Method for producing fused silica ceramic crucible

A technology of fused silica and ceramic crucibles, applied in glass manufacturing equipment, manufacturing tools, glass molding and other directions, can solve the problems of low stiffness, difficult to control curing time, long drying cycle, etc., to simplify the operation process, save energy and production. time, the effect of ensuring uniformity

Inactive Publication Date: 2011-05-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method has certain defects
First of all, the ceramic green body obtained by gel injection molding has the elasticity similar to rubber, but the rigidity is low. Due to the large size of the crucible green body, it is difficult to control the deformation of the crucible due to the weight of the crucible before it is completely dried; Secondly, during the process of vacuuming and degassing the quartz ceramic slurry, due to the rapid discharge of air, it is easy to cause the gelation of the slurry to proceed in advance, so the curing time is difficult to control; thirdly, the fused silica crucible is made by gel injection molding , it usually needs to be dried under high humidity and room temperature for a long time until the green body no longer shrinks significantly, and then it can be dried at a higher temperature, so the drying cycle is very long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The first step is to prepare particle-graded fused silica ceramic powder

[0020] According to 100Kg of fused silica ceramic powder, weigh 5Kg of quartz powder with a particle size of 0.1μm to 1.0μm, 45Kg of quartz powder with a particle size of 0.1μm to 1.0μm, and 55Kg of fused silica powder with a particle size of 10μm to 100μm. Perform dry mixing in a mixer for 5 hours to obtain fused silica ceramic mixed powder for making a crucible and set aside.

[0021] The second step is to prepare the master mix

[0022] Prepare the premix according to 100Kg, the preferred formula is as follows: ethyl silicate 35Kg, absolute ethanol 30Kg, isopropanol 2.5Kg, propylene glycol methyl ether 10Kg, acidic silica sol 22Kg, hydrochloric acid 0.5Kg, add the above chemical reagents into the mixing tank , using strong stirring to mix the above chemical reagents uniformly to obtain a mixed solution, and using a cooling method to control the temperature of the mixed solution between 7-11°C...

Embodiment 2

[0028] The first step is to prepare particle-graded fused silica ceramic powder

[0029] According to 100Kg of fused silica ceramic powder, weigh 10Kg of quartz powder with a particle size of 0.1μm to 1.0μm, 45Kg of quartz powder with a particle size of 0.1μm to 1.0μm, and 45Kg of fused silica powder with a particle size of 10μm to 100μm. Carry out dry mixing in the mixer, the mixing time is 3h, obtain the mixed powder of fused silica ceramics for making the crucible, set aside.

[0030] The second step is to prepare the master mix

[0031] Prepare the premix according to 100Kg, the preferred formula is as follows: ethyl silicate 35Kg, absolute ethanol 30Kg, isopropanol 2.5Kg, propylene glycol methyl ether 10Kg, acidic silica sol 22Kg, hydrochloric acid 0.5Kg, add the above chemical reagents into the mixing tank , using strong stirring to mix the above chemical reagents uniformly to obtain a mixed solution, and using a cooling method to control the temperature of the mixed so...

Embodiment 3

[0037] The first step is to prepare particle-graded fused silica ceramic powder

[0038] According to 100Kg of fused silica ceramic powder, weigh 20Kg of quartz powder with a particle size of 0.1μm to 1.0μm, 60Kg of quartz powder with a particle size of 0.1μm to 1.0μm, and 20Kg of fused silica powder with a particle size of 10μm to 100μm. Perform dry mixing in a mixer for 2 hours to obtain fused silica ceramic mixed powder for making a crucible and set aside.

[0039] The second step is to prepare the master mix

[0040] Prepare the premix according to 100Kg, the preferred formula is as follows: ethyl silicate 35Kg, absolute ethanol 30Kg, isopropanol 2.5Kg, propylene glycol methyl ether 10Kg, acidic silica sol 22Kg, hydrochloric acid 0.5Kg, add the above chemical reagents into the mixing tank , using strong stirring to mix the above chemical reagents uniformly to obtain a mixed solution, and using a cooling method to control the temperature of the mixed solution between 7-11°...

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PUM

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Abstract

The invention relates to a method for producing a fused silica ceramic crucible, which belongs to the technical field of a nonmetallic material. The method comprises the steps of: blending fused silica ceramic powder with a grain composition and a premix liquid to prepare a sizing agent, and then carrying out vacuum defoaming, pouring, curing, demoulding, drying and sintering to produce a silica ceramic crucible. In the method, the fused silica ceramic powder with a grain composition is used as a raw material, and thus the produced crucible has a uniform organizational structure, excellent thermal shock resistance, high temperature resistance and chemical stability and can meet the process requirements for the production of polysilicon. The method has the advantages of simple process, short production period and low cost and is suitable for industrialized application.

Description

technical field [0001] The invention relates to a method in the technical field of inorganic non-metallic materials, in particular to a method for preparing a fused silica ceramic crucible. Background technique [0002] Ceramic crucibles are containers for polysilicon ingots. The solar polysilicon industry mostly uses fused silica as raw material to make ceramic crucibles, mainly because fused silica has high acid and alkali corrosion resistance and thermal shock resistance, especially the thermal expansion coefficient is much lower than other ceramic materials, so quartz ceramic crucibles It has become an irreplaceable key consumable material in the polysilicon production process. [0003] At present, the main methods of making quartz ceramic crucibles include the traditional grouting method and the gel casting method developed in the early 1990s. After searching the prior art, it is found that Chinese Patent Application No. 200810124615.X records a kind of quartz ceramic...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/66C03B20/00
Inventor 李飞吕和平王飞何博孙宝德
Owner SHANGHAI JIAO TONG UNIV
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