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Preparation process of composite material of carbon fiber and asphalt transition layer

A technology of mesophase pitch and composite materials, which is applied in the field of preparation of mesophase pitch transition layer composite materials, can solve the problems of high preparation costs, achieve the effects of reducing preparation costs, improving mechanical properties, and alleviating the mismatch of thermal expansion coefficients

Active Publication Date: 2008-05-21
无锡博智复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortage of high-temperature equipment required to prepare the pyrolytic carbon transition layer in the prior art, the present invention provides a method for preparing a carbon fiber and pyrolytic carbon matrix mesophase pitch transition layer composite material, using mesophase pitch as carbon / carbon The transition layer between carbon fiber and pyrolytic carbon matrix in carbon composite materials does not require high-temperature equipment during the preparation process to achieve the purpose of reducing preparation costs

Method used

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  • Preparation process of composite material of carbon fiber and asphalt transition layer
  • Preparation process of composite material of carbon fiber and asphalt transition layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: First, cut the 3K carbon cloth according to the size of 80mm×80mm, then stack and puncture them together in the Z direction to make a carbon fiber preform of 80mm×80mm×5mm.

[0015] The mesophase pitch powder with a softening point of 290° C. is selected for use, and the mesophase content accounts for about 85% of the weight of the pitch.

[0016] The above carbon fiber preform was placed in a stainless steel impregnation tank of Φ130×120 mm, the preform was embedded with the above mesophase pitch powder, and then put into the impregnation furnace.

[0017] After checking that the seal of the impregnation furnace is in good condition, vacuum the impregnation furnace, and when the vacuum degree reaches 5×10 -3 MPa, the N 2 Pass into the impregnation furnace to replace the air in the furnace, and then vacuum the impregnation furnace again according to the above operation process to ensure that the residual atmosphere in the impregnation furnace is N 2 . When...

Embodiment 2

[0020] Example 2: First, cut the 3K carbon cloth according to the size of 60mm×60mm, then stack and puncture them together in the Z direction to make a carbon fiber preform of 60mm×60mm×4mm.

[0021] The selection of mesophase pitch powder is the same as that in Example 1.

[0022] The above carbon fiber preform was placed in a stainless steel impregnation tank of Φ130×120 mm, the preform was embedded with the above mesophase pitch powder, and then put into the impregnation furnace.

[0023] After checking that the seal of the impregnation furnace is in good condition, vacuum the impregnation furnace, and when the vacuum degree reaches 5×10 -3 MPa, the inert gas Ar 2 Pass into the impregnation furnace to replace the air in the furnace, and then vacuum the impregnation furnace again according to the above operation process to ensure that the residual atmosphere in the impregnation furnace is inert gas Ar 2 . When it is confirmed that the inert atmosphere Ar is in the impregn...

Embodiment 3

[0026] Example 3: First, cut the 3K carbon cloth according to the size of 70mm×70mm, then stack and puncture them together in the Z direction to make a carbon fiber preform of 70mm×70mm×6mm.

[0027] The selection of mesophase pitch powder is the same as that in Example 1.

[0028] The above carbon fiber preform was placed in a stainless steel impregnation tank of Φ130×120 mm, and the preform was embedded with the above mesophase pitch powder, and then put into the impregnation furnace.

[0029] After checking that the seal of the impregnation furnace is in good condition, vacuum the impregnation furnace. When the vacuum degree reaches 5×10 -3MPa, the inert gas He 2 Pass into the impregnation furnace to replace the air in the furnace, and then vacuumize the impregnation furnace again according to the above operation process to ensure that the residual atmosphere in the impregnation furnace is an inert gas He 2 . When it is confirmed that the impregnation furnace is in an in...

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Abstract

The present invention relates to preparation process of composite material of carbon fiber and asphalt transition layer. The carbon fiber prefab is first coated with intermediate phase asphalt powder and soaked under inert gas protection inside stainless steel tank in a dipping oven, and then carbonized through raising temperature and maintaining under inert gas protection in a carbonizing oven and deposited through chemical vapor permeation process in a chemical vapor depositing oven to prepare the C / C composite material with intermediate phase asphalt transition layer. The intermediate phase asphalt form the combining interface of medium strength between the carbon fiber and the pyrolytic carbon base, and this raise the mechanical performance of the composite material. The present invention has relatively low preparation temperature, 600-800 deg.c, and lowered preparation cost.

Description

technical field [0001] The invention relates to a preparation method of a carbon fiber and a pyrolytic carbon matrix transition layer composite material, in particular to a preparation method of a mesophase pitch transition layer composite material. Background technique [0002] Carbon / carbon composites have many excellent properties, but their poor toughness and high brittleness limit their wide application as structural performance parts in military and aerospace fields. Literature [Hariom Dwivedi, Rakesh B. Mathur, Tersem L. Dhami, Om P. Bahl, Marc Monthioux, Sahendra P. Sharma. Evidence for the benefit of adding a carbon interphase in anall-carbon composite. Carbon, 44(4), 2006, 699-709] reported the method of adding a pyrolytic carbon interface transition layer at the interface between carbon fiber and pitch carbon matrix in carbon / carbon composites, and pointed out that adding carbon interface layer in all carbon / carbon composites can make the preparation The toughnes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/64
Inventor 李贺军卢锦花李克智
Owner 无锡博智复合材料有限公司