Composite based on liquid silicon infiltration, carbon/carbon porous material and preparation method of carbon/carbon porous material

A composite material and porous body technology, which is applied in the field of thermal structure composite material manufacturing, can solve the problems of poor mechanical properties of carbon/carbon-silicon carbide composite materials, low content of continuous long fibers, etc., and achieves short preparation cycle, simple process flow, Avoid the effect of residual silicon

Active Publication Date: 2018-11-13
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the existing reactive infiltration method, taking molten silicon infiltration as an example, because the molten silicon infiltration method requires porous bodies to have a continuous and fine pore structure, carbon / carbon porous bodies prepared by acupuncture preforms are usually used for silicon infiltration. The low content of continuous long fibers in the thorn preform leads to poor mechanical properties of the prepared carbon / carbon-silicon carbide composite, which is not suitable for thermal structural parts of spacecraft

Method used

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  • Composite based on liquid silicon infiltration, carbon/carbon porous material and preparation method of carbon/carbon porous material
  • Composite based on liquid silicon infiltration, carbon/carbon porous material and preparation method of carbon/carbon porous material

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preparation example Construction

[0051] The invention provides a method for preparing a carbon / carbon porous body suitable for a fusion siliconizing process, comprising the following steps:

[0052] Step 1), the carbon cloth is made into a carbon fiber reinforcement by a laminated stitching process;

[0053] Specifically, in the embodiment of the present invention, the carbon fiber is preferably one of T300-1K, T300-3K, T300-6K, T300-12K, T700-6K, T700-12K, T800-6K or T800-12K polyacrylonitrile-based carbon fiber One or more than one combination, carbon cloth is preferably satin weave, twill weave, plain weave or stretch cloth made of the above fibers;

[0054] In the embodiment of the present invention, the carbon fiber reinforcement with high fiber volume content is obtained by laminating the carbon cloth and then stitching, preferably the carbon cloth according to [0°] n , [0° / 90°] n or [0° / 45°] n Layers are laid up in the sequence of layers, wherein, n is the number of cycles, and then stitched, the st...

Embodiment 1

[0079] This embodiment provides a carbon / carbon porous body with a specification of 500mm×300mm×6mm and its carbon / carbon-silicon carbide composite material. The preparation method includes:

[0080] 1) Use general-purpose T300-3K polyacrylonitrile (PAN)-based carbon fiber to weave into eight pieces of satin cloth, and then cut it into 550mm×350mm carbon according to the directions of 0° (carbon cloth warp) and 90° (carbon cloth weft) cloth spare;

[0081] 2) Put the carbon cloth in step 1) according to [0° / 90°] 8 Lamination is carried out in the order of circular lamination, according to the volume density of the fabric ≥ 0.8g / cm 3 Control the density of carbon cloth layers, stack them up to the predetermined number of layers, and then stitch them along the thickness direction at a distance of 6 mm to form a three-dimensional fabric (carbon fiber reinforcement), in which two strands of T300-1K fibers are used for the stitching line;

[0082] 3) The three-dimensional fabric ...

Embodiment 2

[0091] This embodiment provides a carbon / carbon porous body with a specification of 500mm×300mm×6mm and its carbon / carbon-silicon carbide composite material. The preparation method includes:

[0092] 1) Use general-purpose T300-1K polyacrylonitrile (PAN)-based carbon fiber to weave into eight satin fabrics, and then cut them into 550mm×350mm carbon fabrics according to the directions of 0° (longitudinal phase of carbon cloth) and 90° (weft direction of carbon cloth). cloth spare;

[0093] 2) Put the carbon cloth in step 1) according to [0° / 90°] 15 Lamination is carried out in the order of circular lamination, according to the volume density of the fabric ≥ 0.8g / cm 3 Control the density of carbon cloth layers, stack them up to the predetermined number of layers, and then stitch them along the thickness direction at a distance of 6 mm to form a three-dimensional fabric (carbon fiber reinforcement), in which two strands of T300-1K fibers are used for the stitching line;

[0094...

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Abstract

The invention provides a composite based on liquid silicon infiltration, a carbon / carbon porous material and a preparation method of the carbon / carbon porous material, and belongs to the field of manufacture of thermal structure composites. The preparation method of the carbon / carbon porous material includes: making carbon fiber reinforcement with carbon cloth by means of layerwise sewing; pretreating the carbon fiber reinforcement; forming a pyrolytic carbon layer on the fiber surface of the pretreated carbon fiber reinforcement by means of chemical vapor deposition so as to obtain a pyrolytic carbon-based carbon / carbon porous material; adding a pore-forming agent and a curing agent into phenolic resin, and mixing to obtain porous resin; soaking the pyrolytic carbon-based carbon / carbon porous material into the porous resin, subjecting the resultant to curing, carbonizing the cured material, graphitizing the carbonized material, and removing the surface resin carbon formed of the porous resin so as to obtain the carbon / carbon porous material suitable for liquid silicon infiltration. A material prepared by subjecting the carbon / carbon porous material prepared herein to liquid silicon infiltration has tensile strength of > / 300 MPa, flexural strength of > / =300 MPa, and weight-loss ratio of less than 1.5% after static oxidation at 1500 DEG C for 20 min.

Description

technical field [0001] This patent relates to a composite material based on a fusion siliconizing process, a carbon / carbon porous body and a preparation method thereof, which is suitable for the engineering preparation of thermal structural materials and belongs to the field of thermal structural composite material manufacturing. Background technique [0002] With the rapid development of science and technology and military needs, the timeliness of weapons and equipment will be further highlighted. There are still obvious deficiencies in the process technology maturity, comprehensive performance and stability of materials, production cycle and cost control of thermal structural composite materials for advanced weapons, which are seriously not suitable for the low cost, short cycle and mass production / quantity of conventional tactical weapons and equipment. This has also become the main obstacle to the popularization and application of thermal structural composite materials. ...

Claims

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Application Information

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IPC IPC(8): C04B35/83C04B35/622C04B41/85
CPCC04B35/622C04B35/83C04B41/5001C04B41/85C04B2235/614
Inventor 冯志海刘宇峰张中伟李同起吴坤
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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