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Moderate-temperature antioxidation coating and preparation method thereof, and carbon/carbon composite product

An anti-oxidation coating and coating technology, applied in mechanical equipment, friction linings, etc., can solve the problem that the anti-catalytic oxidation performance of the coating needs to be further improved

Active Publication Date: 2016-05-25
HUNAN BOYUN NEW MATERIALS
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Problems solved by technology

Fang Xunhua et al. prepared a medium-temperature anti-oxidation coating with phosphate as a transition layer by brushing (Preparation and performance of a medium-temperature carbon / carbon composite material anti-oxidation coating. Carbon Carbon. 2004, 119 (3 ):17~20.), the heat resistance of this medium temperature coating is better, and it can reach the service temperature range of the anti-oxidation coating of auxiliary carbon materials for aircraft brakes, but the anti-catalytic oxidation performance of this coating needs to be further improved

Method used

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  • Moderate-temperature antioxidation coating and preparation method thereof, and carbon/carbon composite product

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preparation example Construction

[0044] The present invention also provides a method for preparing a medium-temperature anti-oxidation coating, comprising the following steps:

[0045] A) The mixed acid solution is coated on the surface of the substrate, and the first coating is obtained after drying, and the mixed acid solution includes H 3 BO 3 and H 3 PO 4 ;

[0046] B) The mixed slurry is coated on the surface of the first coating, and the second coating is obtained after drying, and the mixed slurry includes B 2 o 3 , SiO 2 , Mn(H 2 PO 4 ) 2 , ZrO 2 , CaF 2 、Al 2 o 3 , B 4 C. CeO 2 and silica sol;

[0047] C) coating tetraethyl orthosilicate on the surface of the second coating to form a tetraethyl orthosilicate layer to obtain a coating intermediate; the coating intermediate includes the first coating, compounded on the first coating A second coating layer on the layer and a tetraethyl orthosilicate layer compounded on the second coating layer;

[0048]D) Sintering the coating intermedi...

Embodiment 1

[0063] Step 1. After grinding and polishing the carbon / carbon composite material, ultrasonically clean it with deionized water for 40 minutes, and then put it in an oven to dry for later use; the power of the ultrasonic wave is 100W, and the drying temperature is 120°C.

[0064] Step 2, preparing the B-P mixed acid solution inner coating, the specific process is:

[0065] 1) Weigh 1gH 3 BO 3 , 25mL deionized water, 25mLH 3 PO 4 Mix evenly to make B-P mixed acid solution, and make the inner coating of the coating.

[0066] 2) Brush the B-P mixed acid solution evenly on the surface of the preheated carbon / carbon composite material, put it in the air to dry, and then put it in a drying oven to dry for 2 hours at a temperature of 120°C to form a B-P mixed acid Inner coating.

[0067] Step 3, preparing the ceramic outer coating, the specific process is:

[0068] 1) Weigh 10% of B respectively by mass fraction 2 o 3 , 40% SiO 2 , 5% Mn(H 2 PO 4 ) 2 , 5% ZrO 2 , 5% CaF ...

Embodiment 2

[0078] Step 1. After grinding and polishing the carbon / carbon composite material, ultrasonically clean it with deionized water for 40 minutes, and then put it in an oven to dry for later use; the power of the ultrasonic wave is 100W, and the drying temperature is 120°C.

[0079] Step 2, preparing the B-P mixed acid solution inner coating, the specific process is:

[0080] 1) Weigh 1gH 3 BO 3 , 25mL deionized water, 25mLH 3 PO 4 Mix evenly to make B-P mixed acid solution, and make the inner coating of the coating.

[0081] 2) Brush the B-P mixed acid solution evenly on the surface of the preheated carbon / carbon composite material, put it in the air to dry, and then put it in a drying oven to dry for 2 hours at a temperature of 120°C to form a B-P mixed acid Inner coating.

[0082] Step 3, preparing the ceramic outer coating, the specific process is:

[0083] 1) Weigh 10% of B respectively by mass fraction 2 o 3 , 40% SiO 2 , 8% Mn(H 2 PO 4 ) 2 , 5% ZrO 2 , 5% CaF ...

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Abstract

The invention provides a moderate-temperature antioxidation coating which is prepared by sintering a coating intermediate. The coating intermediate comprises a first coating compounded on a matrix surface, a second coating compounded on the first coating, and an ethyl orthosilicate layer compounded on the second coating. The first coating is prepared from a H3BO3-H3PO4 mixed acid solution. The second coating is prepared from B2O3, SiO2, Mn(H2PO4)2, ZrO2, CaF2, Al2O3, B4C, CeO2 and silica sol. The manganese can promote the flowability of the anti-glass phase in the sintering process; and by using the ethyl orthosilicate as a hole sealing agent, the silicon dioxide generated in the sintering process can fill pores in the antioxidation coating and reduce the risk of peeling of the antioxidation coating. The invention also provides a preparation method of the moderate-temperature antioxidation coating and a carbon / carbon composite product.

Description

technical field [0001] The invention belongs to the technical field of surface coatings, and in particular relates to a medium-temperature anti-oxidation coating, a preparation method thereof and carbon / carbon composite material products. Background technique [0002] Carbon / carbon composite material is a new type of engineering material with special properties. It is a composite material formed by carbon fiber or various carbon fabrics as a reinforcement, and graphitized resin, pitch carbon and chemical vapor deposition carbon as a matrix. Composed almost entirely of elemental carbon, it can withstand high temperatures and extreme heating rates. When mechanically loaded, the deformation and elongation of carbon / carbon composites exhibit pseudoplastic properties, and finally fracture non-brittlely with a work of fracture of about 10 3 -10 4 J / M 2 . It is extremely resistant to impact and thermally induced stress and is somewhat chemically inert. The thermal expansion co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89F16D69/02
CPCC04B41/009C04B41/52C04B41/89F16D69/023C04B35/83C04B41/46C04B41/5016C04B41/5006C04B41/5035C04B41/5015C04B41/5042C04B41/5018C04B41/5031C04B41/5058C04B41/5027C04B41/5089
Inventor 于可欢熊杰张红波
Owner HUNAN BOYUN NEW MATERIALS
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