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Method for batch preparation of uniform density carbon/carbon composite flat by using limited domain reactor

A carbon composite material, a technology of uniform density, applied in the field of carbon/carbon composite materials, can solve the problems of large difference in bulk density between individuals, unfavorable product performance stability, poor densification uniformity, etc., so as to reduce thermal deformation and increase effective utilization. rate, the effect of ensuring uniformity

Active Publication Date: 2018-09-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many preparation processes for carbon / carbon composite flat plates, but due to the difficulty in controlling the gas flow field, the densification uniformity of the single carbon / carbon flat plate components is poor, and in the batch production process, the bulk density difference between individuals Larger, not conducive to stable product performance
[0004] Especially for thick-walled flat plates with a thickness ≥ 25mm, in the deposition process of the prior art, closed-cell phenomenon will also occur, which makes the density gradient of the product in the thick-walled direction large

Method used

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  • Method for batch preparation of uniform density carbon/carbon composite flat by using limited domain reactor
  • Method for batch preparation of uniform density carbon/carbon composite flat by using limited domain reactor
  • Method for batch preparation of uniform density carbon/carbon composite flat by using limited domain reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Uniform vapor phase densification method of carbon / carbon composite flat plate:

[0072] (1) The size specification is 350×350×30mm, the apparent density is 0.46g / cm 3 The carbon fiber integral needle-punched felt is placed in a high-temperature graphitization furnace, and the carbon fiber preform is heat-treated at 1800°C under an argon protective atmosphere and kept for 2 hours.

[0073] (2) According to the attached figure 1 To set up a confinement reactor, first place the gas distribution cap at the bottom center of the cylinder, then place the first gas distribution plate, and then directly load the first group of 4 carbon fiber flat plate preforms on the first distribution block in an upright form. Gas plate, and ensure that any piece of carbon fiber flat prefabricated body stands upright on the blank area of ​​the first gas distribution plate; then install the second gas distribution plate above the first group of carbon fiber flat prefabricated bodies and fix i...

Embodiment 2

[0079] Uniform vapor phase densification method of carbon / carbon composite flat plate:

[0080] (1) Continue to load the carbon / carbon composite material plates obtained in Example 1 according to the order of L1, L2, L3, and L4, and at the same time, rotate the individual carbon / carbon composite material plates by 180° for loading.

[0081] (2) Using propylene as the carbon source gas, nitrogen as the dilution gas, wherein the flow rate of propylene is 35L / min, and the flow rate of nitrogen is 10L / min, and the chemical vapor deposition method is used for pyrolytic carbon densification, and the deposition temperature is 950°C. The deposition pressure is 0.7-0.8kPa, and the deposition time is 100h.

[0082] (3) Carry out surface machining on the carbon / carbon composite material flat plate, load according to the order of L4, L3, L2, L1, and rotate the individual carbon / carbon composite material flat plate by 180° for loading, the above step (2) under the deposition process condit...

Embodiment 3

[0089] Uniform vapor phase densification method of carbon / carbon composite flat plate:

[0090] (1) The size specification is 500×300×7mm, the apparent density is 0.98g / cm 3 The carbon cloth suture prefabricated body was placed in a high-temperature graphitization furnace, and the carbon fiber prefabricated body was heat-treated at 2000 °C under an argon protective atmosphere and kept for 2 hours.

[0091] (2) According to the attached figure 1To set up the confinement reactor, first place the gas distribution cap at the bottom center of the cylinder, then place the first gas distribution plate, and then place the first group of 4 carbon fiber flat plate preforms in an upright form with two pieces of graphite anti-deformation tooling Clamp and load on the first gas distribution plate, and ensure that any piece of carbon fiber flat prefabricated body stands upright on the blank area of ​​the first gas distribution plate; then install the second gas distribution plate on the fi...

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Abstract

The invention discloses a method for batch preparation of a uniform density carbon / carbon composite material flat by using a limited domain reactor. The limited domain reactor comprises a gas pretreatment device, a gas collection device and a deposition device; the deposition device comprises m gas separation plates, an outer cylinder and m-1 groups of side plates; the method comprises the steps that carbon fiber flat prefabricated bodies are erected in a deposition chamber composed of the m gas separation plates and the m-1 groups of side plates, the deposition chamber is further divided intoa plurality of narrow-area reaction space, it is ensured that the carbon fiber flat prefabricated bodies are erected in a blank area of the m gas separation plate, and a barrier to airflow is notformed so that the airflow can be evenly distributed. The method has the advantages of simple process, convenient operation, high utilization rate of carbon source gas and short process period, and the uniformity of bulk density of the obtained monomer carbon / carbon composite material flat is less than +-0.05 g / cm<3>.

Description

technical field [0001] The invention belongs to the field of carbon / carbon composite materials, and in particular relates to a method for batch-preparing carbon / carbon composite material plates with uniform density by using a confining reactor. Background technique [0002] Carbon / carbon composite material is carbon fiber reinforced carbon matrix composite material, which has low density, high specific strength ratio, low thermal expansion coefficient, high thermal and electrical conductivity, creep resistance, thermal shock resistance, ablation resistance and good performance under non-oxidizing medium conditions. Excellent properties such as high temperature mechanical properties and dimensional stability are related to the development of my country's strategic industries and national security, and support the integration of new structures and functions of major national science and technology projects such as advanced aircraft engineering, large aircraft engineering, manned...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/622
CPCC04B35/622C04B35/83C04B2235/614
Inventor 王雅雷熊翔张红波陈招科孙威曾毅
Owner CENT SOUTH UNIV
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