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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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  • 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 the problem of slow cracking rate and uneven heating in the existing method of preparing pyrolytic carbon, especially RL-PyC. Inhomogeneous organizational structure, microscopic uncontrollable problems, etc.

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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Effect test

Embodiment 1

[0049] This example provides a method for rapidly preparing pyrolytic carbon with a rough layer. The method comprises the steps of:

[0050] Microwaves are used 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 area) is 1200° C., and the carbon source gas passing through the silicon carbide tube undergoes a cracking reaction, so that in A rough layer of pyrolytic carbon grows on the surface of the preform. Among them, the structure of the silicon carbide tube is as follows figure 1 , 2 As shown, in the direction extending from the central axis of the tube to the outer wall of the tube, the silicon carbide tube includes an insulating core layer, a first silicon carbide layer, a channel layer, a second silicon carbide layer and an insulating layer, and the first carbonized The silicon layer is sleeved on the surface of the insulating core layer, the insulating layer is sleeved ...

Embodiment 2

[0052] This example provides a method for rapidly preparing pyrolytic carbon with a rough layer. This method refers to the method in Example 1, except 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 the distance in N 2 Natural gas is a carbon source gas, the carbon source mass concentration is 20-40%, the temperature of the deposition area is controlled at 1100°C, the vacuum degree of the system is 60KPa, the deposition time is 30 minutes, the thickness of the pyrolytic carbon reaches 24 microns, and the microstructure is rough layer structure, such as Figure 5 shown.

Embodiment 3

[0054] This example provides a method for rapidly preparing pyrolytic carbon with a rough layer. The method refers to the method in Example 1, except 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 the distance in N 2 For diluting gas, methane is the carbon source gas, the carbon source mass concentration is 50-60%, the temperature of the deposition area is controlled at 1150°C, the vacuum degree of the system is 80KPa, the deposition time is 2 hours, the thickness of the pyrolytic carbon reaches 230 microns, and the microstructure is a rough layer structure, such as Figure 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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