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Clamping device for preparing ultrathin carbon/carbon composite panel

A technology of carbon composite materials and fixtures, which is applied in the field of fixtures for preparing ultra-thin carbon/carbon composite panels, which can solve the problem of ineffective carburization, affecting the uniformity of component density, and unsatisfactory ultra-thin carbon/carbon composite panels. Density requirements and other issues, to achieve the effect of uniform density

Active Publication Date: 2019-01-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Clamping device for preparing ultrathin carbon/carbon composite panel
  • Clamping device for preparing ultrathin carbon/carbon composite panel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] See attached figure 2 , a fixture for preparing an ultra-thin carbon / carbon composite material panel, the fixture is a hollow graphite plate 1, a microporous air guide plate 2, an ultra-thin carbon / carbon composite material blank 3, a microporous air guide plate 2, a hollowed out Graphite plates 1 are stacked in sequence, and the hollow graphite plates on both sides are clamped along the stacking direction;

[0034] The thickness of the hollow graphite plate 1 is 30mm, and the hollow area accounts for 50% of the total area of ​​the graphite plate; the thickness of the ultra-thin carbon / carbon composite material blank is 0.2mm, and the carbon fiber density is 0.8g / cm 3 ;

[0035] Use bolts to pass through the bolt holes arranged on the hollow graphite plate, and fasten with nuts.

[0036] The microporous air guide plate 2 is prepared according to the following scheme:

[0037] The thickness is 1mm, the density is 0.03g / cm 3 T700 carbon fiber mesh tire needle punched...

Embodiment 2

[0044] The difference between this embodiment and Embodiment 1 is that the thickness of the hollow graphite plate 1 is 35mm, and the hollow area accounts for 60% of the total area of ​​the graphite plate; the thickness of the ultra-thin carbon / carbon composite material blank is 0.5mm, and the carbon fiber density is 0.5g / cm 3 ;

[0045] Its microporous air guide plate 2 adopts the following scheme to prepare:

[0046] 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;

[0047] 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 chemica...

Embodiment 3

[0052] The difference between this embodiment and Embodiment 1 is that the thickness of the hollow graphite plate 1 is 40mm, and the hollow area accounts for 55% of the total area of ​​the graphite plate; the thickness of the ultra-thin carbon / carbon composite material blank is 0.8mm, and the carbon fiber density is 0.4g / cm 3 ;

[0053] The microporous air guide plate 2 in the fixture is prepared by the following scheme:

[0054] The thickness is 6mm, the density is 0.03g / cm 3 T700 carbon fiber mesh tire needle punched to a thickness of 12mm and a density of 0.1g / cm 3 The flat felt is densified to 1.4g / 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 10mm;

[0055] Chemical vapor carburizing densification process parameters are: CH 4 It is carbon source gas, the furnace temperature is controlled at 1200°C, the furnace pressure is 10kPa, and the furnace is rel...

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Abstract

The invention relates to a clamping device for preparing an ultrathin carbon / carbon composite panel. The clamping device comprises hollow graphite plates and microporous gas guiding plates, wherein the clamping device is formed through superposing a hollow graphite plate, a microporous gas guiding plate, an ultrathin carbon / carbon composite blank with the thickness of 0.2mm to 0.8mm, a microporousgas guiding plate and a hollow graphite plate, and the hollow graphite plates located at two sides are clamped along a superposition direction. According to the clamping device disclosed by the invention, the structure is simple and reasonable, effective passages of carbon source gas can be constructed between the hollow graphite plates and the ultrathin carbon / carbon composite blank, and the carbon source gas is uniformly guided to the ultrathin carbon / carbon composite blank, so that the problems in density uniformity and deformation of chemical vapor carburization of the blank are solved; and the ultrathin carbon / carbon composite panel with uniform density and smooth surface is prepared and has the density of 1.7g / cm<3> to 2.0g / cm<3> and the thickness of 0.2mm to 0.8mm.

Description

technical field [0001] The invention discloses a fixture for preparing an ultra-thin carbon / carbon composite material panel, which belongs 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 the high-temperature strength perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/52C04B35/622
CPCC04B35/522C04B35/622C04B35/83C04B2235/6567C04B2235/77
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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