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Carbon/carbon composite material anti-oxydation coating

A carbon composite material, anti-oxidation technology, applied in the direction of fibrous filler, inorganic pigment treatment, chemical instruments and methods, etc., can solve the problems of anti-oxidation ability to be improved, complex process, etc., achieve good anti-oxidation ability, simple process, The effect of preventing erosion

Active Publication Date: 2004-11-10
XIAN CHAOMA SCI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these two patent applications have improved the oxidation resistance and moisture resistance of the C / C composite brake disc to varying degrees, the process is relatively complicated, and the oxidation resistance at high temperatures still needs to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1, 10% of silicon, 15% of boron, 70% of phosphate, 5% of aluminum oxide (percentage by weight) are mixed and stirred evenly, after brushing on the surface of the carbon / carbon composite material, heat treatment at 900°C for 2 hours (Nitrogen atmosphere), brush coating and high temperature heat treatment processes are carried out under atmospheric pressure.

Embodiment 2

[0013] Example 2, mix 15% of silicon, 10% of boron, 65% of phosphate, 10% of aluminum oxide (percentage by weight) and stir evenly, after brushing on the surface of the carbon / carbon composite material, heat treatment at 800°C for 3 hours (Nitrogen atmosphere), brush coating and high temperature heat treatment processes are carried out under atmospheric pressure.

Embodiment 3

[0014] Example 3, 15% of silicon, 15% of boron, 60% of phosphate, 10% of aluminum oxide (percentage by weight) are mixed and stirred evenly, after brushing on the surface of the carbon / carbon composite material, heat treatment at 850°C for 2.5 hours (Nitrogen atmosphere), brush coating and high temperature heat treatment processes are carried out under atmospheric pressure.

[0015] The carbon material of the sample in the present invention is selected from Boeing-757 carbon brake disc material, and a small sample of 10mm×10mm×10mm is machined, the surface is brushed with a coating, and it is made after high temperature heat treatment. At 500°C, after 100h oxidation test, the weight loss rate is only 1.25%, and at 700°C, after 20h oxidation test, the weight loss rate is only 6.01%. After 5h oxidation test at 900℃, the weight loss rate is only 6.17%.

[0016] The sample was heated up to 500°C, and then rapidly cooled to room temperature for 50 cycles; the temperature was raise...

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Abstract

A carbon / carbon composite material oxidation-resistant coating comprises the components (by weight portion) of silicon 10%-15%, boron 10%-15%, microcosmic salt 60%-70%, aluminum oxide 5%-10%, the preparation process comprises mixing the four substances, stirring evenly , coating the surface of carbon / carbon composite material, heat treating 2-3 hours (nitrogen atmosphere) at 800 deg. C to 900 deg. C, wherein the coating and high temperature heat treatment processes are carried out under atmospheric pressure.

Description

Technical field [0001] The invention relates to a carbon / carbon composite anti-oxidation coating. Background technique [0002] Because the C / C composite material begins to oxidize when the temperature is higher than 370 ° C in an oxygen atmosphere, the physical and mechanical properties of the material are drastically deteriorated. When the oxidation weight loss reaches 10%, the performance of the material will be seriously affected. For aircraft carbon brake discs, it will affect the braking efficiency and even lead to brake failure. Therefore, effective anti-oxidation treatment of carbon brake discs to ensure the safety of aircraft brakes is a key technology in the manufacturing process of aircraft carbon brake discs. [0003] Chinese Patent Examination and Examination Announcement No. CN1062961 describes an anti-oxidation coating for aircraft C / C composite brake discs, which consists of a dense physical barrier (formed from rare earth borosilicate) and a chemical barrier...

Claims

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Application Information

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IPC IPC(8): C09C1/44C09C3/06
Inventor 肖志超孟凡才张健
Owner XIAN CHAOMA SCI TECH
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