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A kind of surface coating method of carbon fiber and the prepared coated carbon fiber thereof

A surface coating, carbon fiber technology, applied in the field of composite materials, can solve the problem of not being able to meet the technical requirements of reinforced fibers and electromagnetic shielding at the same time, and achieve the effect of strong impurity resistance, excellent electrical conductivity and good dispersion state.

Active Publication Date: 2021-06-25
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology usually coats metals such as nickel or copper on the surface of carbon fibers, but none of them can meet the technical requirements of reinforcing fibers and electromagnetic shielding at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A carbon fiber surface coating method and the prepared coated carbon fiber, the method comprising carbon fiber pretreatment and carbon fiber coating, the carbon fiber pretreatment includes sequentially degumming, roughening, neutralizing and drying the carbon fiber;

[0048] The specific operation of the degumming is as follows: first oxidize the carbon fiber in an air atmosphere at 400° C. for 30 minutes, and then soak the oxidized carbon fiber in acetone at room temperature for 3 hours.

[0049] The specific operation of the roughening is: placing the carbon fiber in concentrated nitric acid, heating to 90° C. for roughening, and the roughening time is 20 minutes respectively.

[0050] The specific operation of the neutralization is: using sodium hydroxide solution to alkali-wash the surface of the carbon fiber after roughening, and then washing and filtering with distilled water.

[0051] The carbon fiber pretreatment also includes heat treatment of the dried carbon ...

Embodiment 2

[0073] A carbon fiber surface coating method and the prepared coated carbon fiber, the method comprising carbon fiber pretreatment and carbon fiber coating, the carbon fiber pretreatment includes sequentially degumming, roughening, neutralizing and drying the carbon fiber;

[0074] The specific operation of the degumming is as follows: first oxidize the carbon fiber in an air atmosphere at 400° C. for 30 minutes, and then soak the oxidized carbon fiber in acetone at room temperature for 3 hours.

[0075] The specific operation of the roughening is: placing the carbon fiber in concentrated nitric acid, heating to 90° C. for roughening, and the roughening time is 20 minutes respectively.

[0076] The specific operation of the neutralization is: using sodium hydroxide solution to alkali-wash the surface of the carbon fiber after roughening, and then washing and filtering with distilled water.

[0077]The carbon fiber pretreatment also includes heat treatment of the dried carbon f...

Embodiment 3

[0098] A carbon fiber surface coating method and the prepared coated carbon fiber, the method comprising carbon fiber pretreatment and carbon fiber coating, the carbon fiber pretreatment includes sequentially degumming, roughening, neutralizing and drying the carbon fiber;

[0099] The specific operation of the degumming is as follows: first oxidize the carbon fiber in an air atmosphere at 400° C. for 30 minutes, and then soak the oxidized carbon fiber in acetone at room temperature for 3 hours.

[0100] The specific operation of the roughening is: placing the carbon fiber in concentrated nitric acid, heating to 90° C. for roughening, and the roughening time is 20 minutes respectively.

[0101] The specific operation of the neutralization is: using sodium hydroxide solution to alkali-wash the surface of the carbon fiber after roughening, and then washing and filtering with distilled water.

[0102] The carbon fiber pretreatment also includes heat treatment of the dried carbon ...

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Abstract

A surface coating method for carbon fiber and the prepared coated carbon fiber, the method includes carbon fiber pretreatment and carbon fiber coating, the carbon fiber pretreatment includes sequentially degumming, roughening, neutralizing, and drying the carbon fiber. The pretreatment also includes heat treatment of the dried carbon fibers; the heat treatment is performed in a closed environment filled with inert gas, the heat treatment temperature is 700°C-800°C, and the heat treatment time is 1.5h-5h; the carbon fiber coating is included in the pretreatment. Titanium nano-coating was prepared on the surface of carbon fiber to obtain titanium-coated carbon fiber, and Ni-Ti alloy and Fe were prepared on the surface of titanium-coated carbon fiber. 3 O 4 Nanoparticle composite coating; wherein nickel-titanium alloy and Fe are prepared on the surface of titanium-coated carbon fiber 3 O 4 The nanoparticle composite coating adopts dual-frequency ultrasonic mode. The coated carbon fiber prepared by the coating method of the invention has good wettability with the metal material matrix, and has electromagnetic shielding performance in medium and high frequency bands and low frequency bands, and can prepare a magnetic shielding composite material with excellent performance.

Description

technical field [0001] The invention relates to a carbon fiber surface coating method and the prepared coated carbon fiber, belonging to the technical field of composite materials. Background technique [0002] Carbon fiber has a series of excellent properties such as high specific strength, high specific modulus, high temperature resistance, ablation resistance, and wear resistance. on maglev trains. [0003] Carbon fiber can be used as a reinforcing fiber for metal materials on car bodies, but due to the non-metallic nature of carbon fiber, its combination with metal materials has become a bottleneck in the development of this type of composite material. Due to the low strength of the mechanical and physical bonding interface, the carbon fiber is often pulled out, peeled off or falls off when it is under load, which limits the performance of the composite material. Therefore, the key to preparing composite materials with excellent physical and mechanical properties is to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C47/04C25D15/00C25D3/56C25D5/54C25D7/06C25D5/20C25D5/22C23C26/00C23C28/02C22C101/10
CPCC22C47/04C23C26/00C23C28/027C25D3/562C25D5/20C25D5/22C25D5/54C25D7/0607C25D15/00
Inventor 苟国庆高唯陈佳于金朋郭糠单美乐朱忠尹张曦
Owner SOUTHWEST JIAOTONG UNIV
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