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Method for interface modification of carbon/carbon composite material by graphene/polymer coating

A technology of polymer coating and carbon composite materials, applied in the direction of graphene, nano-carbon, etc., can solve the problems of high temperature resistance, etc., and achieve the effects of improved ablation resistance, interface performance and low cost

Inactive Publication Date: 2012-11-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the defect that the modified carbon / carbon composite material prepared by the existing interface modification method is not resistant to high temperature, and to provide a method for graphene / polymer coating interface modified carbon / carbon composite material

Method used

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0014] Specific embodiment one: This embodiment is a method for modifying the carbon / carbon composite material at the interface of a graphene / polymer coating, which is specifically completed according to the following steps:

[0015] 1. Graphite oxidation: first mix strong oxidizing acid and nitrate evenly, then add graphite, and cool down from room temperature to -5°C~0°C. Add a strong potassium-containing oxidant under the condition of 120mg / min, then raise the temperature to 10°C~30°C, and continue stirring at a stirring speed of 300rpm~500rpm for 5h~10h to obtain a reaction mixture, and then transfer the reaction liquid to a temperature of 10 ℃~50℃ in a warm water bath, and continue to react for 40min~2h to obtain a reaction solution, then add hot water at 90℃~100℃ to boil the reaction solution and continue boiling for 20min~5h, then add a mass fraction of 55%~65 % hydrogen peroxide aqueous solution, and stir to mix evenly, then let it stand for 0.5h~1h, then wash with ult...

specific Embodiment approach 2

[0029] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the nitrate described in the step one is sodium nitrate, potassium nitrate, calcium nitrate, magnesium nitrate etc.; The strong oxidizing acid described in the step one is Concentrated sulfuric acid or perchloric acid; Potassium-containing strong oxidizing agent described in step one is potassium permanganate or potassium perchlorate. Others are the same as the first embodiment.

specific Embodiment approach 3

[0030] Specific embodiment three: the difference between this embodiment and one of specific embodiments one or two is: the specific operation of the water washing described in step one is as follows: first, the mixture after standing is centrifuged at a centrifugal speed of 4000rpm~6000rpm for 20min ~40min to obtain a solid, then add ultrapure water to the solid, and stir at a stirring speed of 50rm~150rmp for 8min~12min, and then centrifuge at a centrifugal speed of 3000rpm~12000rpm for 20min~40min to obtain a solid after washing once. Continue to add ultrapure water, stir and centrifuge repeatedly to the obtained solid after washing until there is no SO in the supernatant obtained by centrifugation. 4 2- So far, that is, there is no SO in the filter cake obtained by centrifugation 4 2- until. Others are the same as those in Embodiment 1 or 2.

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Abstract

A method for interface modification of carbon / carbon composite material by graphene / polymer coating, relates to a carbon / carbon composite material modification method. The method aims to resolve the disadvantage that the modification carbon / carbon composite material prepared by existing interface modification methods could not endure high temperature. The method comprises the following steps: 1, oxidizing graphite to obtain oxidized graphite powder; 2, preparing a solution of oxidized graphene; 3, purification; 4, preparing the graphene; 5, preparing a graphene / polymer coating solution; 6, coating carbon fibers; 7, carbonization processing. The method is advantageous in that: 1, the operation is simple and the cost is low; and 2, interface properties of the carbon / carbon composite material prepared by the method are improved by 20-80%, macroscopic mechanical properties of the carbon / carbon composite material prepared by the method are improved by 3-30%, and ablation resistance properties of the carbon / carbon composite material prepared by the method are improved by 10-50%, compared with those of the untreated materials. The method is mainly used for preparing interface modification carbon / carbon composite materials.

Description

technical field [0001] The invention relates to a method for modifying carbon / carbon composite materials. Background technique [0002] Carbon / carbon composite material is a new type of high-temperature material with unique properties. It combines the excellent mechanical properties of fiber-reinforced composite materials and the excellent high-temperature performance of carbonaceous materials. A series of excellent properties such as thermal shock, corrosion resistance and good vibration absorption. The density of the material is less than 2.0g / cm 3 , only 1 / 4 of the nickel-based superalloy, 1 / 2 of the ceramic material, especially as the temperature rises (up to 2500 ° C), the strength of this material not only does not decrease, but is even higher than room temperature, which is other The unique performance that the material can't match. Therefore, carbon / carbon composite materials have been widely used in the aerospace field. For example, key parts of aircraft systems...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C01B31/04C01B32/184
Inventor 姜再兴李晶波张大伟黄玉东刘丽田雪松周波李萌布赫张冬洁马梓阳
Owner HARBIN INST OF TECH
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