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Coated carbon-carbon composite material crucible and preparation method thereof

A technology of carbon-carbon composite materials and crucibles, which is applied to the growth of polycrystalline materials, chemical instruments and methods, and self-melting liquid extraction methods, etc., can solve the problems of high production costs and difficult control of the process, and achieve extended life and comprehensive The effect of low cost and uniform coating thickness

Active Publication Date: 2021-05-07
HUNAN SHIXIN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above patents have the disadvantages of high production cost and difficult control of the process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Prepare coating solution

[0041] Add 350g of fused silica sand with a particle size of 10-70μm, 200g of silicon powder with a particle size of 50-90μm, and 25g of additives ZnO and BaO with a particle size of 40-80nm into 1000g of furan resin liquid with a viscosity of 50Pa.S. Mix well and evenly to obtain the coating liquid; wherein, the purity of the fused silica sand is greater than 99.9wt%, and the purity of the silicon powder is greater than 99.5wt%.

[0042] Coated Crucible

[0043] Set the density to 0.50g / cm 3 The carbon fiber crucible preform was densified by CVD to a density of 1.40g / cm 3 Machining, then surface cleaning, drying to obtain the carbon-carbon composite material crucible body, and then coating liquid on the inner surface of the carbon-carbon composite material crucible body, and then in a vacuum environment (the absolute pressure in the furnace is less than 400Pa) , heat up to 1450°C at a rate of 180°C / h for high-temperature heat treatment, and ...

Embodiment 2

[0046] Prepare coating solution

[0047] 450g of fused silica sand with a particle size of 10-70μm, 250g of silicon powder with a particle size of 50-90μm and additive Al with a particle size of 40-90nm 2 o 3 Add 30g each of BaO and 30g to 1000g of furan resin liquid with a viscosity of 100Pa.S, and mix well to obtain a coating liquid; wherein, the purity of fused silica sand is greater than 99.9wt%, and the purity of silicon powder is greater than 99.5wt%.

[0048] Coated Crucible

[0049] Set the density to 0.50g / cm 3 The carbon fiber crucible preform was densified by CVD to a density of 1.35g / cm 3 Machining, then surface cleaning, drying to obtain the carbon-carbon composite material crucible body, and then coating liquid on the inner surface of the carbon-carbon composite material crucible body, and then in a vacuum environment (the absolute pressure in the furnace is less than 600Pa) , heat up to 1650°C at a rate of 200°C / h for high-temperature heat treatment, and hol...

Embodiment 3

[0052] Prepare coating solution

[0053] 300g of fused silica sand with a particle size of 6.5-75μm, 150g of silicon powder with a particle size of 30-90μm and 40g of additive Al with a particle size of 10-80nm 2 o 3 Add it into 1000g of furan resin liquid with a viscosity of 80Pa.S, and mix well to obtain a coating liquid; wherein, the purity of the fused silica sand is greater than 99.9wt%, and the purity of the silicon powder is greater than 99.5wt%.

[0054] Coated Crucible

[0055] Set the density to 0.50g / cm 3 The carbon fiber crucible preform was densified by CVD to a density of 1.65g / cm 3 Machining, then surface cleaning, drying to obtain the carbon-carbon composite material crucible body, and then coating liquid on the inner surface of the carbon-carbon composite material crucible body, and then in a vacuum environment (the absolute pressure in the furnace is less than 600Pa) , heat up to 1300°C at a rate of 100°C / h for high-temperature heat treatment, and keep wa...

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Abstract

The invention discloses a coating carbon-carbon composite material crucible and a preparation method thereof. The coating carbon-carbon composite material crucible comprises a carbon-carbon composite material crucible and a silicon carbide coating attached to the inner surface of the carbon-carbon composite material crucible. The preparation method comprises the steps that the inner surface of the carbon-carbon composite material crucible body is coated with coating liquid, and then high-temperature heat treatment is conducted to obtain the coated carbon-carbon composite material crucible. The coating liquid is composed of resin, fused quartz sand, silicon powder and an additive, and the mass ratio of the resin to the fused quartz sand to the silicon powder to the additive is 100: (20-50): (10-30): (2-8); the additive is selected from at least one of Al2O3, ZnO, Li2O and BaO. The silicon carbide coating prepared by the method can effectively improve the surface state of the crucible and avoid reaction erosion of silicon steam, silicon-containing gas and a quartz crucible to the carbon-carbon composite material crucible at high temperature, so that the service life of the carbon-carbon composite material crucible is prolonged.

Description

technical field [0001] The invention belongs to the technical field of thermal field tooling / components for single crystal silicon drawing furnaces, and in particular relates to a coated carbon-carbon composite material crucible and a preparation method. Background technique [0002] With the rapid development of monocrystalline silicon solar cells, monocrystalline solar cells have surpassed polycrystalline solar cells, occupying a dominant position in the solar cell market (monocrystalline solar cells have a market share of more than 50%): driving the solar industry to monocrystalline silicon demand. As an important thermal field material for the production of single crystal silicon (rod), the carbon-carbon composite material crucible has also been developed rapidly. [0003] At present, when a monocrystalline silicon furnace draws a monocrystalline silicon rod, a quartz crucible containing polycrystalline silicon is placed in a carbon-carbon composite material crucible. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87C30B15/10C30B29/06
CPCC04B41/87C04B41/009C04B41/5035C04B41/5049C04B41/5072C30B15/10C30B29/06C04B35/83C04B41/4539C04B41/5031
Inventor 肖天梁沈益顺
Owner HUNAN SHIXIN NEW MATERIALS CO LTD