Method for quickly preparing rough laminar pyrolytic carbon

A rough layer, pyrolysis carbon technology, applied in the field of carbon materials, can solve the problems of uneven structure, slow cracking rate, uneven heating, etc., and achieve the effect of stable structure, lower production cost, and uniform structure

Active Publication Date: 2016-10-12
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, and provide a method for rapidly preparing pyrolytic carbon with a rough layer, so as to solve t

Method used

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  • Method for quickly preparing rough laminar pyrolytic carbon
  • Method for quickly preparing rough laminar pyrolytic carbon
  • Method for quickly preparing rough laminar pyrolytic carbon

Examples

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Example Embodiment

[0048] Example 1

[0049] This embodiment provides a method for rapidly preparing rough layer pyrolysis carbon. The method includes the following steps:

[0050] Using microwaves to heat the preform and the silicon carbide tube at the same time so that the temperature of the preform (that is, the temperature of the deposition zone) is 1200°C, and the carbon source gas passing through the silicon carbide tube undergoes a cracking reaction, so that A rough layer of pyrolytic charcoal is grown on the surface of the preform. Among them, the structure of the silicon carbide tube is as figure 1 , 2 As shown, the silicon carbide tube includes a heat-insulating core layer, a first silicon carbide layer, a channel layer, a second silicon carbide layer, and a heat-insulating layer, which extends from the center of the tube to the outer wall of the tube. The silicon layer is sleeved on the surface of the thermal insulation core layer, the thermal insulation layer is sleeved on the surface o...

Example Embodiment

[0051] Example 2

[0052] This embodiment provides a method for rapidly preparing rough layer pyrolysis carbon. This method refers to the method in Example 1, but the difference is that the distance between the first silicon carbide layer and the second silicon carbide layer contained in the silicon carbide tube is 2 cm, and N 2 It is a dilution gas, natural gas is a carbon source gas, the mass concentration of carbon source is 20-40%, the temperature of the deposition zone is controlled to 1100℃, the system vacuum is 60KPa, the deposition is 30 minutes, the thickness of pyrolytic carbon reaches 24 microns, and the microstructure is Rough layer structure, such as Figure 5 Shown.

Example Embodiment

[0053] Example 3

[0054] This embodiment provides a method for rapidly preparing rough layer pyrolysis carbon. This method refers to the method in Example 1, but the difference is that the distance between the first silicon carbide layer and the second silicon carbide layer contained in the silicon carbide tube is 3 cm, and N 2 It is the dilution gas, methane is the carbon source gas, the mass concentration of the carbon source is 50-60%, the temperature of the deposition zone is controlled to 1150℃, the vacuum degree of the system is 80KPa, the deposition is 2 hours, the thickness of pyrolytic carbon reaches 230 microns, and the microstructure is rough layer Structure like Image 6 Shown.

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Abstract

The invention discloses a method for quickly preparing rough laminar pyrolytic carbon. The method comprises the following steps: heating a silicon carbide tube by adopting microwaves; controlling a temperature of a deposition area to 1000-1400 DEG C; carrying out cracking reaction on a carbon source gas which is introduced into the silicon carbide tube; enabling generated rough laminar pyrolytic carbon to deposit and grow in the deposition area, thereby obtaining the rough laminar pyrolytic carbon. According to the method for quickly preparing rough laminar pyrolytic carbon disclosed by the invention, the microwaves are adopted for heating the silicon carbide tube, so that a carbon source can be uniformly heated in a cavity of the silicon carbide tube, and is quickly cracked, and the deposited rough laminar pyrolytic carbon is uniform in tissue structure and is controllable in microstructure. Besides, the method is high in efficiency of preparing the rough laminar pyrolytic carbon and is easy for process condition control; the prepared rough laminar pyrolytic carbon is stable in tissue structure, so that production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of carbon materials, and in particular relates to a method for rapidly preparing rough layer pyrolytic carbon. Background technique [0002] Carbon / carbon composite (C / C) is a new type of composite material with unique properties. Its friction and wear performance is the key to its use as an aircraft brake material, and the structure of matrix carbon plays a decisive role in its friction characteristics. The matrix carbon of carbon / carbon composite materials includes pyrolytic carbon (CVD carbon) obtained by chemical vapor deposition, resin carbon and pitch carbon obtained by liquid phase impregnation, and pyrolytic carbon and impregnated carbon obtained by mixing process. Abroad At present, most companies that produce carbon brake discs use pyrolytic carbon as the matrix carbon. According to different CVD process conditions, three different structures of pyrolytic carbon can be obtained: rough layer (RL), s...

Claims

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Application Information

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IPC IPC(8): C04B35/83
CPCC04B35/83C04B2235/614
Inventor 曾燮榕邹广金肖煜琨邹继兆吴洪亮
Owner SHENZHEN UNIV
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