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Method and depositing furnace for rapidly depositing and preparing C/C composite material by direct heating method

A composite material and deposition furnace technology, which is applied in the field of C/C composite material preparation, can solve the problems of long preparation cycle, high cost, and cost reduction, and achieve the effects of short preparation cycle, low cost and high safety.

Inactive Publication Date: 2015-09-23
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention integrates the advantages of thermal gradient method, electrothermal method and micro-positive pressure method, and aims to provide a method for preparing C / C composite materials by rapid deposition of direct thermal method, and solve the preparation cycle of C / C composite materials in traditional processes. Long, high-cost defects, quickly prepare C / C composites with high mechanical properties and good thermophysical properties, while reducing costs

Method used

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  • Method and depositing furnace for rapidly depositing and preparing C/C composite material by direct heating method
  • Method and depositing furnace for rapidly depositing and preparing C/C composite material by direct heating method

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The processed prefabricated body (take the polyacrylonitrile-based carbon felt type as an example, the density is m=0.25g / cm 3, the size of the carbon felt is 200×10×5mm), electrification along the length direction, when the surface temperature of the preform reaches 700°C, the carbon source gas is introduced, with acetylene as the carbon source gas and nitrogen as the carrier gas, C 2 h 2 =10mL / min, N 2 =100mL / min, purify furnace N before reaction 2 The flow rate is 200mL / min, the purification is 15min, and the initial deposition current is 20A (the selection of the current value is related to the volume and density of the carbon felt, and the initial power per unit volume is 5*10 9 W·m -3 or so, select the appropriate current value), electrify in a steady flow state, deposit for 60h, the SEM appearance of the pyrolytic carbon deposited on the surface of the carbon felt is as follows figure 2 As shown, as the deposition progresses, the current remains constant und...

Embodiment 2

[0039] The processed prefabricated body (take the polyacrylonitrile-based carbon felt type as an example, the density is m=0.25g / cm 3 , cutting the carbon felt size is 200×10×5mm), electrifying along the length direction, when the surface temperature of the prefabricated body reaches 900°C, the carbon source gas is introduced, with acetylene as the carbon source gas and nitrogen as the carrier gas, C 2 h 2 =10mL / min, N 2 =200mL / min, purify furnace N before reaction 2 The flow rate is 200mL / min, the purification is 15min, and the initial deposition current is 20A (the selection of the current value is related to the volume and density of the carbon felt, and the initial power per unit volume is 5*10 9 W·m -3 left and right, select the appropriate current value), electrify in a steady flow state, and deposit for 60h. Finally, the densified material is graphitized to produce a C / C composite material.

Embodiment 3

[0041] Treated prefabricated body (take the polyacrylonitrile-based carbon felt type as an example, the density is m=0.25g / cm 3 , the size of the carbon felt is 200×10×5mm), electrification along the length direction, when the surface temperature of the preform reaches 1000°C, the carbon source gas is introduced, with methane as the carbon source gas, nitrogen as the carrier gas, CH 4 =10mL / min, N 2 =200mL / min, purify furnace N before reaction 2 The flow rate is 200mL / min, the purification is 15min, and the initial deposition current is 20A (the selection of the current value is related to the volume and density of the carbon felt, and the initial power per unit volume is 5*10 9 W·m -3 left and right, select the appropriate current value), electrify in a steady flow state, and deposit for 60h. Finally, the densified material is graphitized to produce a C / C composite material.

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Abstract

The invention belongs to the technical field of composite materials, and relates to a method for rapidly depositing and preparing a C / C composite material by a direct heating method. The method is characterized by comprising the following steps: a prepared prefabricated body is fixed in a depositing furnace, so that the prefabricated body is switched on and heated; the heat generated by heating the prefabricated body enables the carbon source gas to reach pyrolysis temperature, so that the carbon source gas is pyrolyzed, and depositing densification is performed; finally, the densified material is graphitized so as to obtain the C / C composite material. According to the method disclosed by the invention, the equipment investment is low, the operation is simple, the depositing speed is adjustable, the deposition efficiency is high, the energy sources are saved, and the C / C composite material can be prepared without extra equipment.

Description

technical field [0001] The invention relates to a process for preparing C / C composite materials, in particular to a method for preparing C / C composite materials by rapid deposition by direct heating method, and belongs to the field of C / C composite material preparation. Background technique [0002] Carbon / carbon composite material, that is, a composite material composed of carbon fiber (referred to as CF) reinforced carbon matrix, is one of the very few materials that can maintain high mechanical properties above 2000 ° C. It has low density, high specific strength, A series of excellent properties such as high specific modulus, low thermal expansion coefficient, thermal shock resistance, ablation resistance, and gas erosion resistance containing solid particles, especially the unique property that the strength of this material does not decrease but increases with the increase of temperature. Its use as a thermal structural component in high-tech fields such as aerospace ha...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/622
Inventor 徐先锋曾玲升李刚
Owner EAST CHINA JIAOTONG UNIVERSITY
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