Preform structure of carbon/carbon composite material thick plate and thick plate preparation method

A carbon composite material and preform technology, which is applied in chemical instruments and methods, lamination auxiliary operations, lamination, etc. The sealing effect is aggravated, and the effect of strong adsorption, reduced density difference and high carburizing efficiency is achieved.

Pending Publication Date: 2019-02-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing carbon / carbon composite material prefabricated body structure is that the carbon fiber mesh tire is needle-punched into a flat felt with a certain thickness. With the increase of the thickness of the flat felt, the surface sealing effect is intensified in the process of chemical vapor carburizing, and the overall increase of the composite material. Therefore, it is difficult to obtain high-density carbon / carbon composite slabs with the existing carbon / carbon composite prefabricated structure

Method used

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  • Preform structure of carbon/carbon composite material thick plate and thick plate preparation method

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Experimental program
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Effect test

Embodiment 1

[0022] See attached figure 1 , a prefabricated body structure of a carbon / carbon composite material slab, the prefabricated body structure includes a core layer and a tire mesh layer, the core layer is a carbon fiber felt with a thickness of 20-40mm, and the tire mesh layer is needle-punched Carbon fiber mesh tires on both sides of the core layer;

[0023] The carbon fiber felt of the core layer is a carbon fiber needle-punched integral felt or a carbon fiber three-dimensional weaving felt with a density of 0.4-0.8g / cm 3 ;

[0024] The carbon fiber of the tire net layer is T700, the thickness of the net tire layer is 2-10mm, and the density is 0.1-0.3g / cm 3 .

Embodiment 2

[0026] A method for preparing a thick plate of carbon / carbon composite material. The prefabricated structure of a thick plate of carbon / carbon composite material is placed in a chemical vapor phase carburizing furnace, and after chemical vapor phase carburizing and densification, graphitization treatment, Machining; repeat the above process once, and the obtained carbon / carbon composite material has a density of 1.85g / cm 3 ;

[0027] The technical parameters of chemical vapor carburizing and densification each time are: use propylene or natural gas as the carbon source gas, control the furnace temperature at 900°C, furnace pressure at 1kPa, and chemical vapor carburizing for 50 hours;

[0028] 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 2000°C, the holding time is 1h, and the furnace is cooled;

[0029] Machining is to process the surface of the tire mesh layer on the workp...

Embodiment 3

[0033] A method for preparing a thick plate of carbon / carbon composite material. The prefabricated structure of a thick plate of carbon / carbon composite material is placed in a chemical vapor phase carburizing furnace, and after chemical vapor phase carburizing and densification, graphitization treatment, Machining; repeat the above process 4 times, the obtained carbon / carbon composite material has a density of 1.80g / cm 3 ;

[0034] The technical parameters of chemical vapor carburizing and densification each time are: use propylene as the carbon source gas, control the furnace temperature at 950°C, furnace pressure at 6kPa, and chemical vapor carburizing for 100 hours;

[0035] 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 2h, and the furnace is cooled;

[0036] Machining is to process the surface of the tire mesh layer on the workpiece that has b...

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Abstract

The invention relates to a preform structure of a carbon/carbon composite material thick plate and a thick plate preparation method. The preform structure consists of a core layer and tire net layers.The core layer is a carbon fiber felt with a thickness of 20-40mm. The tire net layers are carbon fiber mesh tires needle punched on both sides of the core layer. The thick plate preparation method includes: placing the preform structure in a chemical vapor carburizing furnace, conducting chemical vapor carburizing densification, and then performing graphitization treatment and machining in order; and repeating the above technological process until the density of the carbon/carbon composite material reaches the design requirement. The preform structure of the carbon/carbon composite materialthick plate utilizes the mesh tire layers as the carbon source gas transmission medium to guide the carbon source gas evenly to the core layer, thus lowering the density difference of the core layer thickness direction, and solving the surface hole sealing problem of the core layer. The prepared the high density carbon/carbon composite material thick plate has a thickness of 20-40mm and a densityof 0.4-0.8g/cm<3>.

Description

technical field [0001] The present invention relates to a prefabricated body structure of a carbon / carbon composite material thick plate and a method for preparing a carbon / carbon composite material thick plate, in particular to a prefabricated structure of a high-density carbon / carbon composite material thick plate prepared by chemical vapor carburizing and Slab preparation method. The invention belongs to the technical field of chemical vapor phase carburizing. Background technique [0002] Chemical vapor carburizing is the preferred method for preparing high-performance carbon / carbon composites. It is achieved by decomposing and depositing carbon in carbon source gas on the surface of carbon fibers at high temperature, and its efficiency depends on the concentration of carbon source gas on the surface of carbon fibers. The carbon source gas is transmitted to the interior through the surface of the carbon / carbon composite material. During the chemical vapor phase carburiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/00B32B5/02B32B9/04B32B5/26B32B33/00B32B38/00B32B38/10C04B35/84C04B35/83
CPCB32B5/02B32B5/26B32B33/00B32B38/00B32B38/10B32B2250/03B32B2250/40B32B2262/106C04B35/83C04B2235/48C04B2235/77C04B2235/95
Inventor 张福勤黄伯云曾凡浩杨宇夏莉红
Owner CENT SOUTH UNIV
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