Carbon/carbon compound material heating element and production technology thereof

A carbon composite material and production process technology, applied in the field of high-temperature furnace components, can solve problems such as high impurity content and complicated process, and achieve the effect of simple process, stable structure and strong cohesion

Active Publication Date: 2009-03-18
HUNAN KINGBO CARBON CARBON COMPOSITES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The densification process adopted in this method requires repeated densification treatment several times to make the product density ≥ 1.83g / cm 3 The process can only be completed when the process is relatively complicated, the impurity content is high, and chlorine and freon must be introduced to purify the product, which brings a certain pressure on environmental protection. Today, people's awareness of environmental protection is increasing, which is what people do not want. of

Method used

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  • Carbon/carbon compound material heating element and production technology thereof
  • Carbon/carbon compound material heating element and production technology thereof
  • Carbon/carbon compound material heating element and production technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Blank making:

[0024] ① Opening and forming: Shorten long carbon fibers into short carbon fibers with a length of 25mm to 70mm, open them into fluffy needle-like fibers through opening equipment, and then air-laid and / or carded the opened carbon fibers into a network, Utilize net laying machine to pave fiber net again, prepuncture net tire, the area density of described net tire is 20g / m 2 ~200g / m 2 (the present embodiment is 120g / m 2 );

[0025] ② Winding and needle punching forming Using the method of near-net forming, the mesh tire is wound on the mold (U-shaped mold in this embodiment), and a layer of carbon cloth is covered on it. The surface density of the carbon cloth is 100g / m 2 ~400g / m 2 (the present embodiment is 260g / m 2 ), and then covered with a layer of mesh tire, the mesh tire and carbon cloth are overlapped to the required thickness, and compounded by acupuncture to make the required carbon / carbon composite heating body prefabricated body, the ...

Embodiment 2

[0034] In step (1), the heating element preform is processed into a plate shape, and its apparent density is 0.61g / cm 3 , the apparent density after densification is 1.65g / cm 3 , cut into strips earlier during machining, and then machined into bars, the remainder is the same as in Example 1.

Embodiment 3

[0036] In step (1), the mold is cylindrical, and the finished product processed into a heating element is also cylindrical, and the apparent density of the heating element preform is 0.5g / cm 3 , the apparent density after densification is 1.59g / cm 3 , The cylindrical heating element is evenly distributed with the conduction and heat dissipation grooves 1 formed by machining, and the remainder is the same as that of the embodiment 1.

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Abstract

The invention discloses a simple-process environment-friendly carbon/carbon composite heating element and a production process thereof, which is characterized in that the heating element is prepared by making blank from carbon fibers, densifying, purifying, machining and purifying; the heating element is simple in process; as a net body formed by fluffy needle-like carbon fibers is adopted in the process of making the blank, a quasi-3D prefabricated part is easier to obtain in a needling process; the carbon fibers inside the prefabricated part are crisscrossed, strong in cohesive force, free from delamination and stable in structure; meanwhile, the prefabricated part is small in pore, which facilitates the acceleration of the subsequent densifying process; the heating element blank prepared through chemical vapor deposition densification consists of the carbon fibers and a carbon matrix, wherein the carbon matrix is formed by pyrolytic carbon obtained through a high temperature pyrolysis mode, which is high in purity; and a carbon/carbon composite product with the ash content less than 180 ppm can be obtained only through high-temperature purification in a vacuum or protective atmosphere, thereby saving energy and protecting environment.

Description

Technical field: [0001] The invention relates to a high-temperature furnace component such as a polysilicon furnace and a single crystal furnace, in particular to a heating element made of carbon / carbon composite material and its production process. Background technique: [0002] Polysilicon furnaces and single crystal furnaces are the main equipment commonly used in the solar photovoltaic industry, and their maximum operating temperature is as high as 1600°C. At present, resistance heating is often used, and the heating element is generally made of three-high graphite. Due to the poor mechanical properties of graphite, the strength of the product is low, it is easily broken under the action of external force, and the service life is short. In addition, the heat and shock resistance of graphite is not good, and it is easy to produce microcracks under repeated high temperature thermal shock conditions. The power and the thermal field in the furnace change, which affects the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/622
Inventor 廖寄乔邰卫平王跃军龚玉良
Owner HUNAN KINGBO CARBON CARBON COMPOSITES CO LTD
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