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High-performance carbon-carbon crucible surface coating and preparation method thereof

A surface coating and carbon crucible technology, which is applied in the field of high-performance carbon-carbon crucible surface coating and its preparation, can solve the problem of unsatisfactory high temperature oxidation resistance of the outer coating, formation of cavities or pores on the surface of the protective film, coating Loss of oxidation protection ability and other problems, to achieve the effect of expanding the range of high temperature use, reducing the oxygen penetration rate, and excellent high temperature oxidation resistance

Active Publication Date: 2021-12-10
醴陵市东方电瓷电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the SiO2 protective film formed by the current composite coating can effectively block the infiltration of oxygen in a high-temperature oxidation environment, but with the increase of oxidation temperature and the extension of oxidation time, the high-temperature oxidation resistance of the outer coating currently studied None of them are ideal (the best achievable anti-oxidation temperature of the existing composite coating is 1650°C), and the SiO2 generated by the inner coating has a lower viscosity and serious volatilization, and defects such as cavities or pores are formed on the surface of the protective film, thus making the coating loss of oxidation protection

Method used

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  • High-performance carbon-carbon crucible surface coating and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The carbon carbon crucible surface coating provided in this embodiment is from the SiC transition layer and LAB 6 / Y 3 Al 5 O 12 The outer coat layer, which is first deposited in the surface of the carbon carbon crucible to deposit the SiC transition layer, and then coat the Lab by the slurry method. 6 / Y 3 Al 5 O 12 External coat. The method of preparing the surface coating of the carbon carbon crucible, comprising the steps of:

[0037] (1) Matrix pretreatment: Place the carbon carbon crucible in a container configured with ethanol, washed in an ultrasonic cleaner, ultrasonic 15min, and repeatedly cleaned 3 times to remove the stains of the carbon carbon.

[0038] (2) SI powder, C powder and B 2 O 3 In the ball mill, the ball mill is 600r / min, with deionized water as a medium, ball milling 18h, dry, uniform A powder, Si powder, C powder and Al 2 O 3 The powder is placed in a ball mill, the ball mill is 600 r / min, with deionized water as a medium, ball milling 18h, a...

Embodiment 2

[0048] The composition, formulation, and preparation method of the surface coating provided in this embodiment are the same as that in Example 1, as follows:

[0049] In this embodiment, the Si powder, C powder and B of the A powder 2 O 3 The mass ratio of powder is 4.5: 1: 0.8.

[0050] In this embodiment, the Si powder, C powder and Al of B powder 2 O 3 The mass ratio of powder is 4.5: 1: 1.

[0051] In this example, B powder, LA 2 O 3 Y 3 Al 5 O 12 Powder and Al powder mass ratio is 2: 4: 1: 0.3.

[0052] In the step (5) of the present embodiment, the binder used is a polyvinyl butylade, and the mass of the binder is 5% of the mixed powder mass, and the mass of deionized water used is a mixed powder mass. 3 times.

[0053] The heat treatment process of step (5) of the present embodiment is: set the pressure in the high temperature hot press furnace to 15 MPa, first temperature up to 150 ° C, heat insulation 2 h at the rate of 5 ° C / min; then heat up at a rate of 10 ° C / min ...

Embodiment 3

[0055] The composition, formulation, and preparation method of the surface coating provided in this embodiment are the same as that in Example 1, as follows:

[0056] In this embodiment, the Si powder, C powder and B of the A powder 2 O 3 The mass ratio of powder is 4: 1: 0.7.

[0057] In this embodiment, the Si powder, C powder and Al of B powder2 O 3 The mass ratio of powder is 4: 1: 1.

[0058] In this example, B powder, LA 2 O 3 Y 3 Al 5 O 12 Powder and Al powder mass ratio is 1: 4: 1: 0.2.

[0059] In the step (5) of the present embodiment, the binder used is a polyvinyl butylade, the use of the binder is 4% of the mixed powder mass, and the mass of deionized water used is a mixed powder quality. 2 times.

[0060] The heat treatment process of the step (5) of the present embodiment is: set the pressure in the high temperature hot press furnace to 12 MPa, first temperature rising at a rate of 4 ° C / min to 180 ° C, heat insulation 2 h; then warmed at the rate of 8 ° C / min U...

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Abstract

The invention discloses a high-performance carbon-carbon crucible surface coating and a preparation method thereof, and relates to the technical field of carbon-based composite materials. The invention discloses a high-performance carbon-carbon crucible surface coating. The coating is mainly characterized in that a SiC transition layer and a LaB6 / Y3Al5O12 outer coating are sequentially deposited on a substrate of a carbon-carbon crucible, the SiC transition layer is deposited by adopting a multi-time embedding method, and the LaB6 / Y3Al5O12 outer coating is formed by coating by adopting a slurry method; and the SiC transition layer is formed by dipping treatment of an organic silicon impregnant and then brushing of outer coating slurry. The invention further discloses a preparation method of the carbon-carbon crucible surface coating. The carbon-carbon crucible surface coating provided by the invention has excellent high-temperature strength, high-temperature toughness and high wear resistance, is good in thermal shock resistance and chemical stability, and has relatively high thermal expansion compatibility with a carbon-carbon matrix, so that the service life of the carbon-carbon crucible is remarkably prolonged, the damage resistance degree of the carbon-carbon crucible is remarkably improved, and the carbon-carbon crucible can be used for resisting oxidation for a long time at 1,750 DEG C.

Description

Technical field [0001] The present invention belongs to the technical field of carbon-based composite, and more particularly to a high performance carbon carbon crucible surface coating and a preparation method thereof. Background technique [0002] With the enhancement of governments and people's awareness and intensity, solar energy, the green environmental protection industry has developed in my country, and the number of single crystal silicon furnaces has increased rapidly from 8,000 in 2000 to around 8,000 sets. Thus, the demand for the essential crucible of single crystal silicon furnace has grown sharply, and the rapid development of carbon / carbon composite 坩 坩 in the field of single crystal silicon furnace is also driven. Carbon / carbon composite crucible is a high-tech product processed by a composite material composed of high strength fibers and carbon matrices, and the graphite product is energy saving, large-scale material, excellent performance, long life, high r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89C04B35/565C04B35/58C04B35/622
CPCC04B41/52C04B41/89C04B41/009C04B35/565C04B35/44C04B35/5805C04B35/62222C04B35/83C04B41/5059C04B41/507C04B41/5032
Inventor 李陵
Owner 醴陵市东方电瓷电器有限公司
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