Carbon/carbon composite material crucible with composite ceramic layer and preparation method of carbon/carbon composite material crucible

A technology of carbon composite materials and composite ceramics, which is applied in the field of thermal field components for single crystal silicon drawing furnaces, can solve the problems of softening and deformation of quartz crucibles, high cost of single crystal silicon, and high cost of raw materials, so as to reduce thermal expansion coefficient and reduce raw materials The effect of simple cost and preparation process

Active Publication Date: 2021-07-23
HUNAN SHIXIN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, considering the production environment of the single crystal silicon drawing furnace, on the one hand, the high temperature of molten silicon causes the quartz crucible to soften and deform; on the other hand, the gap between the quartz crucible and the C/C composite crucible and the inside of the The silicon material on the surface itself will remain part of the silicon material, which eventually leads to the silicon remaining on the inner surface of the quartz crucible during the process of changing the silicon from liquid to solid. At the ...

Method used

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  • Carbon/carbon composite material crucible with composite ceramic layer and preparation method of carbon/carbon composite material crucible

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Effect test

Embodiment 1

[0045] Such as figure 1 As shown, a carbon / carbon composite material crucible with a composite ceramic layer of the present invention comprises a carbon / carbon composite material crucible base (11) and a composite ceramic layer (12) respectively attached to its inner surface, and its specific preparation The steps are as follows:

[0046] Step 1, preparation of carbon fiber preform

[0047] According to the shape and size requirements of the crucible, the preparation method of the conventional carbon fiber prefabricated body mat is used to alternately stack the non-weft cloth and the mesh layer, and then the density is 0.2g / cm by acupuncture. 3 carbon fiber prefabricated body;

[0048] Step 2, densification of carbon fiber preform

[0049] Using chemical vapor infiltration (CVI), using propylene as the gas source of chemical vapor deposition, the carbon fiber preform obtained in step 1 is densified to a density of 1.1 g / cm 3 carbon / carbon composites;

[0050] Step 3, Mach...

Embodiment 2

[0067] Step 1, preparation of carbon fiber preform

[0068] According to the shape and size requirements of the crucible, the preparation method of the conventional carbon fiber prefabricated body mat is used to alternately stack the non-weft cloth and the mesh layer, and then the density is 0.6g / cm by acupuncture. 3 carbon fiber prefabricated body;

[0069] Step 2, densification of carbon fiber preform

[0070] The carbon fiber prefabricated body is impregnated-cured and carbonized by impregnating furan resin, and then chemical vapor infiltration (CVI) is used, with propylene as the gas source of chemical vapor deposition, and the carbon fiber obtained in step 1 The preform is densified to a density of 1.4g / cm 3 carbon / carbon composites;

[0071] Step 3, Machining

[0072] The carbon / carbon composite material obtained in step 2 is mechanically polished to obtain a carbon / carbon composite material crucible with a surface roughness Ra of 0.8mm;

[0073] Step 4, preparation...

Embodiment 3

[0088] Step 1, preparation of carbon fiber preform

[0089] According to the shape and size requirements of the crucible, the preparation method of the conventional carbon fiber prefabricated body mat is used to alternately stack the non-weft cloth and the mesh layer, and then the density is 0.4g / cm by acupuncture. 3 carbon fiber prefabricated body;

[0090] Step 2, densification of carbon fiber preform

[0091] The carbon fiber prefabricated body is impregnated-cured and carbonized by impregnating furan resin, and then chemical vapor infiltration (CVI) is used, with propylene as the gas source of chemical vapor deposition, and the carbon fiber obtained in step 1 The preform is densified to a density of 1.25g / cm 3 carbon / carbon composites;

[0092] Step 3, Machining

[0093] The carbon / carbon composite material obtained in step 2 is mechanically polished to obtain a carbon / carbon composite material crucible with a surface roughness Ra of 0.5mm;

[0094] Step 4, preparatio...

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Abstract

The invention discloses a carbon/carbon composite material crucible with a composite ceramic layer and a preparation method thereof. The carbon/carbon composite material crucible is composed of a carbon/carbon composite material crucible base body and the composite ceramic layer attached to the inner surface of the carbon/carbon composite material crucible base body, the thickness of the composite ceramic layer ranges from 1 mm to 5 mm, the composite ceramic layer is composed of, by mass, 50%-70% of silicon carbide, 10%-40% of boron nitride and 10%-20% of silicon. According to the preparation method, a split type preparation method is adopted for the carbon/carbon composite material crucible base body with the composite ceramic layer, a composite ceramic layer blank is prepared firstly, then the composite ceramic layer blank is bonded through a binding agent, then carbonization and siliconizing treatment are conducted, and the carbon/carbon composite crucible base body and the composite ceramic layer become a whole. By means of the preparation method, the composite ceramic layer which is thick enough can be obtained, and therefore erosion of silicon steam to the carbon/carbon composite material crucible base body is effectively restrained.

Description

technical field [0001] The invention belongs to the technical field of thermal field components for single crystal silicon drawing furnaces, and in particular relates to a carbon / carbon composite material crucible with a composite ceramic layer and a preparation method thereof. Background technique [0002] In recent years, with the depletion of fossil energy and people's requirements for energy conservation and environmental protection, the country has vigorously advocated the development of the photovoltaic industry. In the current field of photovoltaic technology, monocrystalline silicon solar cells are the most mature technology with relatively high photoelectric conversion efficiency. High, therefore, the current market demand for monocrystalline silicon is huge. [0003] However, more than 80% of the production of single crystal silicon adopts the CZ (Czochralski, CZ method for short) Czochralski method, that is, it is prepared by pulling a seed crystal in a single cry...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/52C04B35/622C04B41/87
CPCC04B35/83C04B35/52C04B35/622C04B41/87C04B41/5096C04B41/009C04B2235/422C04B2235/77C04B2235/96C04B41/5064C04B41/5059C04B41/45C04B41/0072
Inventor 鲍思权周娩红朱苏华
Owner HUNAN SHIXIN NEW MATERIALS CO LTD
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