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A kind of preparation method of carbon fiber interface

A technology of carbon fiber preform and carbon fiber, which is applied in the field of carbon fiber interface preparation, can solve the problems of composite material strength reduction, high preparation temperature, and long preparation time, and achieve the effects of improving fracture toughness, solving toughness decline, and improving toughness

Inactive Publication Date: 2021-01-05
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this interface is applied to polymer-based composites, it has disadvantages such as long preparation time, high preparation temperature, and weak combination with the polymer matrix, resulting in a decrease in the strength of the composite.

Method used

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  • A kind of preparation method of carbon fiber interface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of interface solution: dissolve polycarbosilane in xylene, the mass ratio of polycarbosilane to xylene is 1:10;

[0021] Vacuum pressure impregnation: Put the carbon cloth (Toray T300 1K plain weave) and the interface solution in a vacuum tank at the same time, vacuumize at -0.08MPa~-0.10MPa for 20 minutes, then slowly pressurize, and raise the air pressure to 0.8MPa, Hold for 30 minutes;

[0022] Drying and curing: After taking out the carbon cloth, cool it at room temperature for 3-10 hours, cure it in an oven at 120°C-130°C for 2-5 hours, cure it at 140-160°C for 2-5 hours, and cure it at 180-200°C 2 to 5 hours;

[0023] Prepare phenolic resin solution: dissolve phenolic resin and hexamethylenetetramine in absolute ethanol, the quality of hexamethylenetetramine is 10% of the quality of phenolic resin, and control the viscosity of the solution by controlling the content of absolute ethanol to be 50- 100mPa·s;

[0024] Vacuum pressure impregnation: put t...

Embodiment 2

[0027] Preparation of interface solution: dissolve polycarbosilane in xylene, the mass ratio of polycarbosilane to xylene is 1:10;

[0028] Vacuum pressure impregnation: Put the carbon cloth (Toray T300 1K plain weave) and the interface solution in a vacuum tank at the same time, vacuumize at -0.08MPa~-0.10MPa for 20 minutes, then slowly pressurize, and raise the air pressure to 0.8MPa, Hold for 30 minutes;

[0029] Drying and curing: After taking out the carbon cloth, cool it at room temperature for 3-10 hours, cure it in an oven at 120°C-130°C for 2-5 hours, cure it at 140-160°C for 2-5 hours, and cure it at 180-200°C 2 to 5 hours;

[0030] Preparation of boron-modified phenolic resin solution: dissolving boron-modified phenolic resin in absolute ethanol, controlling the viscosity of the solution to 50-100 mPa·s by controlling the content of absolute ethanol;

[0031] Vacuum pressure impregnation: put the prepared carbon cloth and resin solution in the vacuum tank at the s...

Embodiment 3

[0034] Preparation of interface solution: dissolve polycarbosilane in xylene, the mass ratio of polycarbosilane to xylene is 1:10;

[0035] Vacuum pressure impregnation: Put the carbon cloth (Toray T300 1K plain weave) and the interface solution in a vacuum tank at the same time, vacuumize at -0.08MPa~-0.10MPa for 20 minutes, then slowly pressurize, and raise the air pressure to 0.8MPa, Hold for 30 minutes;

[0036] Drying and curing: After taking out the carbon cloth, cool it at room temperature for 3-10 hours, cure it in an oven at 120°C-130°C for 2-5 hours, cure it at 140-160°C for 2-5 hours, and cure it at 180-200°C 2 to 5 hours;

[0037] Preparation of boron-modified resin slurry: Dissolve boron-modified phenolic resin in absolute ethanol, add borosilicate glass powder to it after fully dissolving, the mass ratio of powder to resin is 10-40%, through controlling absolute ethanol The viscosity of the content control solution is 50-100mPa·s;

[0038] Vacuum pressure impr...

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Abstract

The invention relates to a preparation method of a carbon fiber interface. A vacuum soaking method is used for preparing a polycarbosilane interface on the surface of carbon fiber; in the ablation process, an SiO2 and SiC protection layer can be formed in oxidization or low-temperature ablation environment, so that the anti-oxidization and anti-ablation performance of the carbon fiber can be improved. After the interface oxidization cracking, the porous weak interface layer can be formed; the toughness of the carbon fiber composite material is improved. After the polycarbosilane pyrolysis, a porous interface layer is formed, so that the composite material in the ablation process has good interface matching performance; after the oxidization for 0.5h at 800 DEG C, the three-point bending intensity and fracture toughness are respectively improved by 59 percent and 37 percent. The realization of the structure and function integral application of the polymer-based composite material in a thermal protection system becomes possible. The carbon fiber interface can be used for ablation or anti-ablation polymer-based composite materials; the ablation performance and the mechanical performance in the ablation process can be improved; the structure function integration of the polymer-based composite material in application of the thermal protection field can be realized.

Description

technical field [0001] The invention belongs to a method for preparing a fiber interface of an ablation-resistant or ablation-resistant carbon fiber-reinforced polymer-based composite material, and relates to a method for preparing a carbon fiber interface. Polycarbonate is prepared on the surface of a carbon fiber by vacuum pressure impregnation. The silane interface can improve the oxidation resistance and ablation resistance of polymer composites, and is expected to realize the structural-functional integration of polymer thermal protection materials. Background technique [0002] Carbon fiber reinforced polymer matrix composites are widely used in the field of aerospace thermal protection due to a series of advantages such as low cost, low density, good thermal insulation performance, and high specific strength. However, the polymer will be pyrolyzed when it exceeds 600 °C, resulting in a sharp decline in the mechanical properties of the composite material. Therefore, p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L61/06C08L61/14C08K9/06C08K7/06C08K3/38
CPCC08K3/38C08K7/06C08K9/06C08L61/06C08L61/14
Inventor 王一光段刘阳曹晔洁
Owner NORTHWESTERN POLYTECHNICAL UNIV
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