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Preparation method of carbon fiber composite pre-oxidized filament preform

A carbon fiber and prefabricated body technology, applied in chemical instruments and methods, textiles and papermaking, lamination auxiliary operations, etc., can solve the problem of poor uniformity and permeability of preformed body surface pores, unfavorable continuous high temperature carbonization and vapor deposition, acupuncture Unreasonable density and depth, etc., to achieve the effect of excellent uniformity and permeability, not easy to delaminate, reasonable needle density and depth

Inactive Publication Date: 2019-07-02
YIXING YITAI CARBON FIBER WEAVING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the unreasonable density and depth of needle punching, the carbon fiber preform produced by the original process has poor uniformity and permeability on the surface of the preform, and is easy to delaminate, which is not conducive to continuous high-temperature carbonization and vapor deposition in the later stage. Low temperature and low air flow are used for infiltration densification treatment, which greatly prolongs the densification cycle and continuously increases production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The preparation method of the carbon fiber composite pre-oxidized silk prefabricated body of this embodiment comprises the following steps:

[0014] 1) Use a weaving machine to weave 12K carbon fiber into a weft-free unidirectional carbon fiber cloth.

[0015] 2) Cut the PAN pre-oxidized fiber filaments into short fibers with a length of 56mm, spray water to keep the humidity of the short fibers at 4%, then put them in an oven and heat them to 45°C, keep them warm for 18 hours, take them out and break them up with an opener Separation, and then send the separated short fibers to the air-laid equipment to make a net tire, the thickness of the net tire is 0.52mm, and the surface density of the net tire is 88g / ㎡.

[0016] 3) The carbon fiber cloth is laid flat, combined with the mesh tire as interlayer filling, superimposed layer by layer, and needle punched layer by layer to obtain a three-dimensional overall structure prefabricated body with an interlayer density of 18 l...

Embodiment 2

[0019] The preparation method of the carbon fiber composite pre-oxidized silk prefabricated body of this embodiment comprises the following steps:

[0020] 1) Use a weaving machine to weave 12K carbon fiber into a weft-free unidirectional carbon fiber cloth.

[0021] 2) Cut the PAN pre-oxidized fiber filaments into short fibers with a length of 60mm, spray water to keep the humidity of the short fibers at 5%, then put them in an oven and heat them to 45°C, keep them warm for 19 hours, take them out and break them up with an opener Separation, and then send the separated short fibers to the air-laid equipment to make a net tire, the thickness of the net tire is 0.57mm, and the surface density of the net tire is 115g / ㎡.

[0022] 3) Lay the carbon fiber cloth flat, combine the mesh tire as the interlayer filling, superimpose layer by layer, and needle punch layer by layer to obtain a three-dimensional overall structure prefabricated body, the interlayer density is 19 layers / cm, a...

Embodiment 3

[0024] The preparation method of the carbon fiber composite pre-oxidized silk prefabricated body of this embodiment comprises the following steps:

[0025] 1) Use a weaving machine to weave 12K carbon fiber into a weft-free unidirectional carbon fiber cloth.

[0026] 2) Cut the PAN pre-oxidized fiber filaments into short fibers with a length of 64mm, spray water to keep the humidity of the short fibers at 6%, then put them in an oven and heat them to 45°C, keep them warm for 20 hours, take them out and break them up with an opener Separation, and then send the separated short fibers to the air-laid equipment to make a net tire, the thickness of the net tire is 0.65mm, and the surface density of the net tire is 260g / ㎡.

[0027] 3) Lay the carbon fiber cloth flat, combine the mesh tire as the interlayer filling, superimpose layer by layer, and needle punch layer by layer to obtain a three-dimensional overall structure prefabricated body, the interlayer density is 20 layers / cm, ...

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Abstract

The invention provides a preparation method of a carbon fiber composite pre-oxidized filament preform. The method comprises the following steps: 1) weaving weft-free unidirectional carbon fiber clothby using 12K carbon fibers through a braiding machine; 2) performing shearing on PAN pre-oxidized fiber filaments, spraying water, performing heating, and performing opening to prepare a net; and 3) flatly spreading the carbon fiber cloth, using the carbon fiber cloth combining with the net as interlayer filling, performing stacking layer by layer, and performing needle punching layer by layer toobtain the three-dimensional overall structural preform. According to the preparation method provided by the invention, the preform produced by the method has a compact structure and is not easy to layer, uniformity and permeability of surface pores of the preform are excellent, so that the subsequent densification period is greatly shortened; and the method has a simple production process and lowproduction costs.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a method for preparing a carbon fiber composite pre-oxidized silk prefabricated body. Background technique [0002] Carbon / carbon composite material is a composite material with carbon fiber as the reinforcing material and carbon as the matrix. As a key component of high temperature resistance and corrosion resistance in equipment, carbon / carbon composite materials have excellent characteristics such as high strength, high modulus, excellent heat insulation, and high density. They are used in machinery, electronics, chemical industry, metallurgy, nuclear energy, aerospace and national defense and other fields are widely used. [0003] Carbon / carbon composite material is formed by carbonization and densification of carbon fiber prefabricated body after repeated vapor deposition or dipping in CVD furnace. Due to the unreasonable density and depth of needle punching, the uniform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B5/26B32B9/00B32B9/04B32B38/00D04H1/42D04H1/732
CPCB32B5/26B32B38/00B32B2038/0052B32B2262/106D04H1/42D04H1/732
Inventor 蒋洪亮
Owner YIXING YITAI CARBON FIBER WEAVING
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