Phosphate Anti-oxidation Coating for Carbon/Carbon Composite Materials and Its Coating Technology

A technology of carbon composite material and phosphate, which is applied in the coating process of making the above-mentioned phosphate anti-oxidation coating, and the field of phosphate anti-oxidation coating of carbon/carbon composite material, which can solve the difficulty of field maintenance and the high cost of raw materials , Coating thickness is not easy to control and other problems, to achieve the effect of superior anti-oxidation performance

Active Publication Date: 2022-05-10
德翼高科(杭州)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a phosphate anti-oxidation coating of a carbon / carbon composite material, which uses a phosphate anti-oxidation coating to replace the anti-oxidation coating of the traditional borosilicate series, thereby It solves the shortcomings of existing coating technology such as high toxicity, high cost of raw materials, difficult control of coating thickness, difficult post-processing, and difficult field maintenance, etc., and the preparation method is simple and the application range is wide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] By weight percentage, dry, grind and mix the powders of 25%-30% of aluminum hydroxide and 25%-8% of CeO, then add 20%-25% of phosphorus oxide and 40%-60% of distilled water, and stir them evenly; The mixture is heated to 100°C and held for 20-30 minutes to fully react to generate a phosphate aqueous solution; thermally coated on the non-friction surface of the carbon brake disc of the Xinzhou 60 aircraft, and treated at a high temperature of 1200°C in a controlled atmosphere 1.5 hours to serve.

[0034] The above carbon brake discs were subjected to performance testing to test the performance of the phosphate anti-oxidation coating as follows:

[0035] ①Static heating simulation test.

[0036] Equipment: Thermogravimetric analyzer (STA409DG / DG);

[0037] Test conditions: placed at 700°C for 50h;

[0038] Test results: The oxidation weight loss rate is only 1.96%.

[0039] ② Thermal shock test.

[0040] Equipment: double-tube high temperature carbon fixing furnace (...

Embodiment 2

[0048] By weight percentage, the Al 2 O 330%-35% and Pr3%-6% powder are dried, ground and mixed, then add phosphoric acid 25%-30% and distilled water 45%-50% and stir evenly; heat the mixture to 100°C and keep it for 30%. -40 minutes, fully reacted to generate phosphate aqueous solution; thermally coated on the non-friction surface of a certain type of aircraft carbon brake disc, and treated at a high temperature of 900 ℃ for 4 hours in a controlled atmosphere.

[0049] The above carbon brake discs were subjected to performance testing to test the performance of the phosphate anti-oxidation coating as follows:

[0050] ①Static heating simulation test.

[0051] Equipment: Thermogravimetric analyzer (STA409DG / DG);

[0052] Test conditions: under the condition of 800 ℃, placed for 30h;

[0053] Test results: The oxidation weight loss rate is only 2.78%.

[0054] ②Ground bench test.

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PUM

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Abstract

The invention discloses a phosphate anti-oxidation coating of a carbon / carbon composite material, which comprises the following components in weight percentage: 20%-60% of phosphoric acid or phosphorus oxide, 25%-60% of aluminum and calcium stabilizers 50%, rare earth metal or rare earth metal oxide 1%-10%, water 40%-80%, and the sum of the above raw material components is 100%. The invention also discloses a coating process for making the phosphate anti-oxidation coating, which includes the steps of preparing phosphate mixed solution, pretreatment, brushing and high temperature treatment. Compared with the anti-oxidation coatings of the borosilicate series, the invention has the characteristics of no fear of bumping, superior anti-oxidation performance, simple preparation method, wide application range, remarkable economic benefit, safety and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of high-temperature anti-oxidation coatings for carbon / carbon composite brake discs, and in particular relates to a phosphate anti-oxidation coating of carbon / carbon composite materials, a method for preparing the mixed solution of the anti-oxidation coating, and the preparation of the above-mentioned phosphoric acid Application process of salt anti-oxidation coating. Background technique [0002] Carbon / carbon composites have been widely used due to their high strength, high specific modulus, low thermal expansion coefficient, and good dimensional stability in high temperature environments. Since the 1970s, many aircraft at home and abroad have been equipped with carbon brake discs that integrate structural elements, friction elements and heat-absorbing elements. However, when the carbon brake disc, which is an important brake component, is prone to oxidation when the temperature is above 450 ℃, the mechan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/87
CPCC04B41/87C04B41/5048C04B41/009C04B35/83C04B41/4539C04B41/0072
Inventor 杜东伟赵美玲沈杰
Owner 德翼高科(杭州)科技有限公司
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