Method for preparing carbon/carbon-silicon carbide (C/C-SiC) composite self-sealing and anti-oxidation coating

An anti-oxidation coating and composite material technology, applied in the field of carbon material protection, can solve the problems of high equipment conditions, affecting the performance of the coating, large residual thermal stress, etc., to achieve low cost, improve self-healing ability, Composition and structure controllable effect

Inactive Publication Date: 2010-12-08
JIAMUSI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has high requirements on equipment conditions, high production cost, and it is easy to generate large residual thermal stress between the coating and the substrate, which affects the performance of the coating.

Method used

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  • Method for preparing carbon/carbon-silicon carbide (C/C-SiC) composite self-sealing and anti-oxidation coating
  • Method for preparing carbon/carbon-silicon carbide (C/C-SiC) composite self-sealing and anti-oxidation coating
  • Method for preparing carbon/carbon-silicon carbide (C/C-SiC) composite self-sealing and anti-oxidation coating

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: the preparation method of the anti-oxidation coating of C / C-SiC composite material

[0029] (1) Surface treatment of the C / C-SiC composite material: the surface of the C / C-SiC composite material was ground and polished, washed with water, and then ultrasonically cleaned with absolute ethanol for 20 minutes, then dried and set aside.

[0030] (2) Preparation of coating materials: Polysilazane with a molecular weight of 2000-3000 and B with a particle size of 1-2 μm 4 C powder is mixed into a homogeneous slurry in a mass ratio of 60%: 40%.

[0031] (3) Brushing-sintering process: apply the slurry prepared in the above (2) on the surface of the C / C-SiC composite material after the treatment in (1), and put it into a nitrogen furnace. The heating process is as follows: first in Cross-linking and curing at 200°C for 1 hour, then raising the temperature to 1250°C at a rate of 5°C / min, keeping the temperature for 1 hour, and then cooling down to room temperature...

Embodiment 2

[0034] Embodiment 2: the preparation method of the anti-oxidation coating of C / C-SiC composite material

[0035] (1) Surface treatment of the C / C-SiC composite material: the surface of the C / C-SiC composite material was ground and polished, washed with water, and then ultrasonically cleaned with absolute ethanol for 20 minutes, then dried and set aside.

[0036] (2) Preparation of coating materials: Polysilazane with a molecular weight of 2000-3000 and B with a particle size of 1-2 μm 4 C powder is mixed into a homogeneous slurry in a mass ratio of 50%: 50%.

[0037] (3) Sintering process: apply the slurry prepared in the above (2) on the surface of the C / C-SiC composite material after the treatment in (1), put it into a nitrogen furnace, and the heating process is: first at 250 °C The cross-linking was cured for 1 hour, then the temperature was raised to 1200°C at a rate of 5°C / min, kept at a temperature of 2 hours, and then cooled to room temperature at a rate of 5°C / min. ...

Embodiment 3

[0040] Embodiment 3: the preparation method of the anti-oxidation coating of C / C-SiC composite material

[0041] (1) Surface treatment of the C / C-SiC composite material: the surface of the C / C-SiC composite material was ground and polished, washed with water, and then ultrasonically cleaned with absolute ethanol for 20 minutes, then dried and set aside.

[0042] (2) Preparation of coating materials: Polysilazane with a molecular weight of 2000-3000 and B with a particle size of 1-2 μm 4 C powder is mixed into a homogeneous slurry in a mass ratio of 60%: 40%.

[0043] (3) Sintering process: apply the slurry prepared in the above (2) on the surface of the C / C-SiC composite material treated by (1), put it into a nitrogen furnace, and the heating process is: first at 200 °C After cross-linking and curing for 2 hours, the temperature was raised to 1300°C at a rate of 5°C / min, kept at a temperature of 1 hour, and then cooled to room temperature at a rate of 5°C / min.

[0044] (4) S...

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Abstract

The invention discloses an effective method for preparing a C / C-SiC composite self-sealing and anti-oxidation coating by conversion of a precursor, which belongs to the field of carbon material protection. A Si3N4 / SiC / B4C anti-oxidation coating with a certain self-sealing capability is prepared by taking active group-containing polysilazane precursor polymer as a raw material and adding a proper amount of B4C packing and by a coating-sintering process. The process comprises the following steps of: firstly, mixing polysilazane and the B4C powder in a certain proportion uniformly to prepare slurry, and coating the slurry on the surface of a C / C-SiC composite subjected to surface treatment; secondly, placing the C / C-SiC composite in a nitrogen furnace to perform crosslinking and curing at the temperature of between 200 and 300 DEG C for 1 to 2h; thirdly, heating at a speed of 5 DEG C / min till the temperature is 1,200 to 1,300 DEG C, keeping the temperature for 1 to 2h and then slowly cooling to room temperature; and finally, performing reinforcement treatment for 1 to 2 times to obtain the Si3N4 / SiC / B4C ceramic anti-oxidation coating with a uniform and compact surface. The method has the advantages of low preparation temperature, controllable product ingredient and structure, high performance and the like, has obvious advantages in aspects of crack closure, preparation cost reduction and the like and is an anti-oxidation coating preparation method with a great prospect.

Description

technical field [0001] The present invention relates to C / C-SiC composite material surface Si 3 N 4 / SiC / B 4 The invention discloses a preparation method of C gradient and self-healing anti-oxidation coating, which belongs to the field of carbon material protection. Background technique [0002] Carbon / silicon carbide double-matrix composite material (C / C-SiC) first appeared as a thermal structural material in the 1980s. It is a composite material with carbon fiber as reinforcement and carbon and silicon carbide as matrix. It combines carbon fiber The superior mechanical properties of the reinforcement and the good chemical and thermal stability of the ceramic matrix have the characteristics of excellent wear resistance, light weight and high strength. At present, they are mainly used as braking materials, such as brake pads for aviation aircraft, high-speed trains and high-end cars. brake material. However, since the C / C-SiC composite material begins to undergo oxidatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/87
Inventor 刘洪丽田春英胡明李洪波黄志求
Owner JIAMUSI UNIVERSITY
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