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Carbon/carbon composite material anti oxidant coating and its preparing method

A technology of carbon composite material and anti-oxidation coating, which is applied in the direction of coating, etc., can solve the problems of reducing coating technology, economic advantages, increasing coating preparation process steps, and large difference in thermal expansion coefficient, so as to increase the coating precursor Composition, improvement of self-healing ability, and effect of reducing the difference in thermal expansion coefficient

Inactive Publication Date: 2007-02-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Solution impregnation method, there is a phenomenon that the thermal expansion coefficient of the impregnated coating and the carbon / carbon composite material is greatly different, see figure 1 , leading to defects such as cracks and holes, reducing the compactness of the coating, making it easy for oxygen molecules to penetrate the coating to reach the surface of the carbon / carbon material, react with carbon, and cause oxidation
At the same time, it is difficult for the solution impregnation method to effectively dissolve a variety of components with different functions in one solution, and there are relatively large restrictions on composition modulation. Layer composition, which not only increases the thickness of the coating, but also increases the steps of the coating preparation process, thereby reducing the technical and economic advantages of such coatings

Method used

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  • Carbon/carbon composite material anti oxidant coating and its preparing method
  • Carbon/carbon composite material anti oxidant coating and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of sol dip coating:

[0024] ① Weigh 1.5g of boric acid, dissolve it in 50ml of absolute ethanol, measure 10ml of TEOS and dissolve it in the solution.

[0025] ② Dilute 30ml of 85% phosphoric acid solution into 20ml of deionized water.

[0026] ③ Mix the solutions prepared in ① and ② together and stir to make a sol.

[0027] ④Dissolve 10g of ammonium pentaborate in 100ml of deionized water, mix 10ml of the solution with the sol prepared in ③, and stir until it stands still and becomes transparent.

[0028] ⑤Prepare 40wt% zinc dihydrogen phosphate aqueous solution.

[0029] ⑥Mix the sol prepared in ④ with the solution in ⑤ according to the volume ratio of 1:1, and stir until the sol is transparent.

[0030] ⑦ Bake the prepared carbon / carbon composite material sample at 150°C for 2 hours, and quickly immerse it in the prepared sol for 24 hours.

[0031] ⑧Take out the impregnated carbon / carbon composite material sample and place it on the carbon felt, and ...

Embodiment 2

[0034] Preparation of sol dip coating:

[0035] ①Weigh 1.0g of boric acid, dissolve it in 50ml of absolute ethanol, and dissolve 10ml of TEOS in it.

[0036] ② Dilute 10ml of 85% phosphoric acid solution into 20ml of deionized water.

[0037] ③ Mix the solutions prepared in ① and ② together, stir until transparent to form a sol, and let stand for 24 hours.

[0038] ④Weigh 10g of ammonium pentaborate and dissolve it in 100ml of deionized water, add 10ml of the solution into the sol in ③, and stir until transparent.

[0039] ⑤ Prepare 40 (wt)% zinc dihydrogen phosphate aqueous solution.

[0040] ⑥ Mix the sol prepared in ④ with the solution in ⑤ according to the volume ratio of 2:3, and stir until the sol is transparent.

[0041] ⑦ Bake the prepared carbon / carbon composite material sample at 180°C for 2 hours, and quickly immerse it in the prepared sol for 24 hours.

[0042] ⑧Take out the impregnated carbon / carbon composite material sample and place it on the carbon felt, an...

Embodiment 3

[0045] Preparation of sol dip coating:

[0046] ①Weigh 1.5g of boric acid, dissolve it in 50ml of absolute ethanol, and dissolve 10ml of TEOS in it.

[0047] ② Dilute 10ml of 85% phosphoric acid solution into 20ml of deionized water.

[0048] ③Mix the solutions prepared in ① and ② together, and stir until transparent to form a sol.

[0049] ④Weigh 10g of ammonium pentaborate and dissolve it in 100ml of deionized water, add 10ml of the solution into the sol in ③, and stir until transparent.

[0050] ⑤Prepare 40wt% zinc dihydrogen phosphate aqueous solution.

[0051] ⑥ Mix the sol prepared in ④ with the solution in ⑤ according to the volume ratio of 1:3, and stir until the sol is transparent.

[0052] ⑦ Bake the prepared carbon / carbon composite material sample at 180°C for 2 hours, and quickly immerse it in the prepared sol for 24 hours.

[0053] ⑧Take out the impregnated carbon / carbon composite material sample and place it on the carbon felt, and place it in a drying oven t...

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PUM

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Abstract

The present invention relates to liquid coating process, and is especially low temperature antioxidant method of composite C / C material. The present invention features that the sol for soaking composite C / C material is prepared with alcohol as partial solvent to replace distilled water, and has the components including silica 20-40 wt%, phosphoric acid 5-25 wt%, zinc dihydrogen phosphate 40-65 wt% and boric acid 1-10 wt%. Soaking composite C / C material with the sol of the present invention can form oxide coating with no crack, hole and other faults, excellent combination with C, high compactness, high healing capacity, raised oxygen permeation resistance, delayed contact between oxygen and composite C / C material and raised antioxidant performance.

Description

Technical field: [0001] The invention relates to a precursor of a coating liquid, in particular to a precursor of a low-temperature anti-oxidation coating of a carbon / carbon composite material. Background technique: [0002] Solution impregnation method, there is a phenomenon that the thermal expansion coefficient of the impregnated coating and the carbon / carbon composite material is greatly different, see figure 1 , leading to defects such as cracks and holes, reducing the compactness of the coating, making it easy for oxygen molecules to penetrate the coating to reach the surface of the carbon / carbon material, react with carbon, and cause oxidation. At the same time, it is difficult for the solution impregnation method to effectively dissolve a variety of components with different functions in one solution, and there are great limitations in composition modulation. Layer composition, which not only increases the thickness of the coating, but also increases the steps of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D1/00C04B41/50
Inventor 葛毅成易茂中黄伯云
Owner CENT SOUTH UNIV
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