A device for preparing an ultra-thin carbon/carbon composite panel and a method for preparing the panel

A carbon composite material, ultra-thin technology, applied to ceramic products, other household appliances, household appliances, etc., can solve the problem of ineffective carburization, failure to meet the requirements of ultra-thin carbon/carbon composite panel density, and affect the uniform density of components Uniformity and other issues, to achieve the effect of uniform density, uniform chemical vapor carburizing

Active Publication Date: 2021-11-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to certain requirements on the high-temperature strength of graphite, in order to maintain the clamping strength of the hollowed out graphite tooling, the gap between the hollowed out holes is relatively large, and the area of ​​the hollowed out part usually accounts for no more than 60%. The hollow holes of graphite tooling conduct gas, and when chemical vapor deposition is performed, the distribution of carbon source gas on the surface of the component will be uneven. The hollowed out part can be effectively carburized, and the non-hollowed part cannot be effectively carburized, which seriously affects the uniformity and density of the component. Due to the uniformity of performance, the maximum average density of the ultra-thin carbon / carbon composite panel prepared by the prior art of hollow graphite tooling can only reach 1.7g / cm 3 , cannot meet the density requirements for ultra-thin carbon / carbon composite panels

Method used

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  • A device for preparing an ultra-thin carbon/carbon composite panel and a method for preparing the panel
  • A device for preparing an ultra-thin carbon/carbon composite panel and a method for preparing the panel

Examples

Experimental program
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Effect test

Embodiment 1

[0033] See attached figure 2 , a device for preparing an ultra-thin carbon / carbon composite panel, the device includes a hollow graphite plate and a microporous air guide plate; the hollow graphite plate and the microporous air guide plate are stacked to form a support plate, and the An ultra-thin carbon / carbon composite material blank is sandwiched between the microporous air guide plates of the plate, and the two support plates are fastened with fasteners to form a device for preparing ultra-thin carbon / carbon composite material panels;

[0034] The thickness of the microporous air guide plate is 5mm, and the density is 1.0g / cm 3 ;

[0035] The thickness of the hollow graphite plate is 30-50mm, and the hollow area accounts for 40-60% of the total area of ​​the graphite plate;

[0036] Use bolts to pass through the bolt holes arranged on the hollow graphite plate, and fasten with nuts.

Embodiment 2

[0038] See attached figure 1 , a microporous air guide plate in a device for preparing ultra-thin carbon / carbon composite panels is prepared by the following scheme:

[0039] The thickness is 1mm, the density is 0.03g / cm 3 T700 carbon fiber mesh tire needle punched to a thickness of 3mm and a density of 0.3g / cm 3 The flat felt is densified to 1.6g / cm by chemical vapor carburizing 3 1. After hardening, carry out graphitization treatment, and machine to obtain a microporous air guide plate with a thickness of 1mm;

[0040] Chemical vapor carburizing densification process parameters are: CH 4 It is carbon source gas, the furnace temperature is controlled at 1000°C, the furnace pressure is 1kPa, and the furnace is released after cumulative chemical vapor carburizing for 50 hours;

[0041]The graphitization treatment system is: control the atmosphere in the furnace to be argon 0.11-0.13MPa, the furnace temperature to be 2000°C, the holding time to be 2h, and cool down with the ...

Embodiment 3

[0046] A microporous air guide plate in a device for preparing ultra-thin carbon / carbon composite panels is prepared by the following scheme:

[0047] The thickness is 3mm, the density is 0.03g / cm 3 T700 carbon fiber mesh tire needle punched to a thickness of 8mm and a density of 0.2g / cm 3 The flat felt is densified to 0.3g / cm by chemical vapor carburizing 3 , After hardening, carry out graphitization treatment, and machine to obtain a 6mm thick microporous air guide plate;

[0048] Chemical vapor carburizing densification process parameters are: CH 4 It is carbon source gas, the furnace temperature is controlled at 1000°C, the furnace pressure is 3kPa, and the furnace is released after cumulative chemical vapor carburizing for 5 hours;

[0049] The graphitization treatment system is as follows: the atmosphere in the furnace is controlled to be argon 0.11-0.13MPa, the furnace temperature is 2300°C, the holding time is 1h, and the furnace is cooled.

[0050] The device for ...

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Abstract

A device for preparing an ultra-thin carbon / carbon composite panel and a method for preparing the panel, the device includes a hollow graphite plate and a microporous air guide plate; the hollow graphite plate and the microporous air guide plate are stacked to form a support plate, An ultra-thin carbon / carbon composite material blank is sandwiched between the microporous air guide plates of two support plates, and the two support plates are fastened by fasteners to form a device for preparing ultra-thin carbon / carbon composite material panels. The preparation method of the panel is to carry out chemical vapor carburizing and densification of the device in a chemical vapor deposition furnace. The device of the present invention can construct an effective channel for carbon source gas between the hollow graphite plate and the ultra-thin carbon / carbon composite material blank, and guide the carbon source gas evenly to the ultra-thin carbon / carbon composite material blank to solve the chemical problem of the blank. The problem of density uniformity and deformation of vapor-phase carburizing, the preparation of ultra-thin carbon / carbon composite panels with uniform density and flat surface, the density is 1.7‑2.0g / cm 3 , with a thickness of 0.2‑0.8mm.

Description

technical field [0001] The invention discloses a device for preparing an ultra-thin carbon / carbon composite material panel and a method for preparing the panel, belonging to the technical field of chemical vapor deposition. Background technique [0002] Ultra-thin carbon / carbon composite panel refers to a flat plate member with a thickness between 0.2-0.8mm and a flat surface. Generally, chemical vapor carburizing is used to prepare high-performance ultra-thin carbon / carbon composite panels. However, since chemical vapor carburizing is a high-temperature chemical treatment process, ultra-thin flat plate components are easily deformed during this process, and must be fixed with shaping tools. control. [0003] In the prior art, hollow graphite tooling is used to clamp ultra-thin carbon / carbon composite materials for chemical vapor deposition. Through the hollow holes, the carbon source gas is directed to the components, and chemical vapor carburizing is carried out. Using th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/622C04B38/00
CPCC04B35/622C04B35/83C04B38/00C04B2235/46C04B2235/614C04B2235/77C04B38/0067
Inventor 张福勤夏莉红杨宇尹成王小明朱学宏
Owner CENT SOUTH UNIV
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