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Gas-phase rapid preparation method of u-shaped carbon/carbon heating element

A heating element, U-shaped technology, applied in the field of rapid preparation of U-shaped heating elements of carbon/carbon composite materials, can solve the problems of uneven product performance, complicated operation of impregnated carbon technology, high cost, etc., and achieve a significant effect of energy saving and consumption reduction , Precise control of final performance, uniform and stable product performance

Active Publication Date: 2017-01-25
AEROSPACE RUITIAN CARBON MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to: provide a U-shaped carbon / carbon heating element gas-phase rapid preparation method, which solves the disadvantages of long process cycle, low efficiency and high cost of ordinary isothermal CVD technology, and solves the problems of complex operation of impregnated carbon technology and poor product performance. Disadvantages such as unevenness and short service life solve the problem of mass production of U-shaped heating elements

Method used

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  • Gas-phase rapid preparation method of u-shaped carbon/carbon heating element
  • Gas-phase rapid preparation method of u-shaped carbon/carbon heating element

Examples

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Effect test

Embodiment 1

[0020] (1) According to the requirements, prepare a U-shaped heating element with an inner diameter of R75, a length of 1350mm, a width of 100mm, and a wall thickness of 8mm. Firstly, process a mandrel made of graphite material. , the length is 1370mm, the total height is 1550mm, the graphite mandrel is hollow, and the wall thickness is 10mm.

[0021] (2) Use PAN-based 12k carbon fiber, process it into plain carbon cloth, and lay layers on the graphite mandrel to prepare a carbon fiber prefabricated body. The thickness of the prefabricated body is controlled to be 15-16mm, and the calculated initial density is 0.35g / cm 3 .

[0022] (3) Place the assembly of carbon fiber prefabricated body and graphite core mold in the deposition chamber, install energized electrodes, and install temperature control thermocouples, such as figure 1 As shown, the thermocouple is located inside the bottom of the U-shaped preform and is in direct contact with the graphite mandrel.

[0023] (4) Va...

Embodiment 2

[0027] (1) According to the requirements, prepare a U-shaped heating element with an inner diameter of R80, a length of 1760mm, a width of 90mm, and a wall thickness of 12mm. First, process a mandrel made of graphite material. , length 1780mm, total height 1650mm, graphite mandrel is hollow, wall thickness is 15mm.

[0028] (2) Use PAN-based 6k carbon fiber, process it into plain carbon cloth, and lay layers on the graphite mandrel to prepare a carbon fiber prefabricated body. The thickness of the prefabricated body is controlled to be 18-20mm, and the calculated initial density is 0.52g / cm 3 .

[0029] (3) Place the assembly of carbon fiber prefabricated body and graphite core mold in the deposition chamber, install energized electrodes, and install temperature control thermocouples, such as figure 1 As shown, the thermocouple is located inside the bottom of the U-shaped preform and is in direct contact with the graphite mandrel.

[0030] (4) Vacuum the deposition chamber t...

Embodiment 3

[0034] (1) According to the requirements, prepare a U-shaped heating element with an inner diameter of R115, a length of 2050mm, a width of 120mm, and a wall thickness of 15mm. First, process a mandrel made of graphite material. , length 2075mm, total height 1850mm, graphite mandrel is hollow, wall thickness is 18mm.

[0035] (2) Use PAN-based 12k carbon fiber, process it into unidirectional carbon cloth, and lay it on the graphite mandrel to prepare a carbon fiber prefabricated body. The thickness of the prefabricated body is controlled to be 22-25mm, and its initial density is calculated to be 0.46g / cm 3 .

[0036] (3) Place the assembly of carbon fiber prefabricated body and graphite core mold in the deposition chamber, install energized electrodes, and install temperature control thermocouples, such as figure 1 As shown, the thermocouple is located inside the bottom of the U-shaped preform and is in direct contact with the graphite mandrel.

[0037] (4) Vacuum the depo...

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Abstract

The invention provides a preparation method of a U-type carbon / carbon heat-generating body. The preparation method comprises the following steps: (1) preparing a graphite core mould according to the size of a U-type heat-generating body, wherein the graphite core mould is used to support a carbon fiber preform and give off heat after being electrified; (2) wrapping a plurality of layers of carbon cloth on the core mould or laminating multiple layers of carbon cloth together and then stitching the carbon cloth together so as to obtain a carbon fiber preform; (3) installing an assembled unit of the carbon fiber preform and graphite core mould into a precipitation chamber, and fixedly connecting the assembled unit to the upper electrode and lower electrode; (4) directly electrifying the graphite core mould to achieve heating; (5) embedding a temperature thermocouple into the carbon fiber preform, controlling the temperature of the carbon fiber preform to reach a precipitation temperature, and moving the carbon fiber preform from inner to outer at a specific speed to achieve rapid gas-phase densification; (6) after the predetermined precipitation temperature is reached, continuously introducing reaction gas in a certain flow rate. The U-type carbon / carbon heat-generating body is prepared through a gas-phase densification treatment and a machining moulding treatment. The provided method can produce a plurality of heat-generating bodies at one time.

Description

technical field [0001] The invention relates to a rapid preparation method of a carbon / carbon composite U-shaped heating element, in particular to a rapid preparation method of a carbon / carbon composite U-shaped heating element for high-temperature industrial furnaces. Background technique [0002] Carbon / carbon composite U-shaped heating elements are widely used in high-temperature industrial equipment such as hydrogenation furnaces for polysilicon preparation. Its performance and service life play a key role in reducing energy consumption and pollution in the operation of hydrogenation furnaces. Generally, the preparation of U-shaped carbon / carbon heating elements adopts the densification process of isothermal chemical vapor deposition (CVD) or CVD combined with impregnated carbon. However, isothermal CVD technology is the most commonly used and easiest method in the densification process of carbon / carbon materials, which can realize mass production. However, due to the bo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83
Inventor 杨村林姜召阳韩钢韩渤涛敖明于军
Owner AEROSPACE RUITIAN CARBON MATERIALS CO LTD
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