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Antioxidant coating for C/ZrC-SiC composite material, and preparation method thereof

An anti-oxidation coating and composite material technology, applied in the field of composite materials, can solve the problems of low bonding strength between the coating and the substrate, high cost, poor oxidation resistance, etc., and achieve excellent oxidation resistance, good thermal matching performance, enhanced The effect of antioxidant properties

Active Publication Date: 2020-02-11
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent application CN201310545292.2 prepared carbon / carbon composite material HfB by suspension electrolysis 2 anti-oxidation outer coating, but the HfB prepared by this method 2 The bonding strength between the coating and the substrate is low, and it is not suitable for large-scale preparation of components
Chinese patent application CN201410133088.4 prepared ZrB by spraying method 2 - SiC composite coating, but ZrB 2 Easily oxidized to form ZrO 2 , its melting point is low, and the high-temperature oxidation resistance of the coating is general
Chinese patent application CN200610091392.2 prepared TaSi by embedding method combined with CVD method 2 / SiC composite coating, but TaSi 2 The deposition temperature is higher, exceeding 1800°C, the cost is high and the carbon fiber is easily damaged
Chinese patent application CN201811107448.8 prepared an anti-oxidation coating comprising HfB sequentially and alternately formed on the C / SiC composite 2 Coating and SiC coating, although the anti-oxidation coating can enhance the oxidation resistance of the composite material, so that the service temperature of the C / SiC composite material can be increased to 2200 ° C, but the HfB 2 The coating will be oxidized to form B in a high temperature oxidizing atmosphere 2 o 3 , HfO 2 , while the low-melting B 2 o 3 It is easy to volatilize at high temperature, leaving pores, and oxygen is easy to diffuse into the matrix, which leads to the problem of poor oxidation resistance of C / SiC composites when the temperature is higher than 2200 °C

Method used

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  • Antioxidant coating for C/ZrC-SiC composite material, and preparation method thereof
  • Antioxidant coating for C/ZrC-SiC composite material, and preparation method thereof
  • Antioxidant coating for C/ZrC-SiC composite material, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] This example prepares an anti-oxidation coating for C / ZrC-SiC composite material, the specific process is as follows:

[0056] (1) Add 1mol B powder and 1.5mol Hf powder to 2mol ethanol, stir at room temperature for 30min; then add 1mol phenolic resin, place in a water bath at 50°C, stir mechanically for 15min, and prepare ceramic slurry (viscosity: 320mPa· s), then the ceramic slurry is brushed onto the surface of the C / ZrC-SiC composite matrix material;

[0057] (2) Put the composite material in (1) in a curing tank, pressurize to 1MPa, heat up to 200°C for 3 hours to make the ceramic slurry fully cross-linked and solidified, and then place it in a cracking furnace under argon gas Under atmosphere, pyrolyze at 1400°C for 3 hours;

[0058] (3) The composite material in (2) is placed in a deposition furnace, under the condition of 5kPa absolute pressure and 1000°C, trichloromethylsilane is passed through, and the deposition time is 20 hours;

[0059] (4) Repeat steps ...

Embodiment 2

[0062] This example prepares an anti-oxidation coating for C / ZrC-SiC composite material, the specific process is as follows:

[0063] (1) Add 1mol B powder and 2.5mol Hf powder to 3mol ethanol, stir at room temperature for 30min; then add 2mol phenolic resin, place in a water bath at 50°C, stir mechanically for 15min, and prepare ceramic slurry (viscosity: 350mPa· s), then the ceramic slurry is brushed onto the surface of the C / ZrC-SiC composite matrix material;

[0064] (2) Put the composite material in (1) in a curing tank, pressurize to 1MPa, heat up to 200°C for 3 hours to make the ceramic slurry fully cross-linked and solidified, and then place it in a cracking furnace under argon gas Under atmosphere, pyrolyze at 1400°C for 3 hours;

[0065] (3) The composite material in (2) is placed in a deposition furnace, under the condition of 5kPa absolute pressure and 1000°C, trichloromethylsilane is passed through, and the deposition time is 20 hours;

[0066] (4) Repeat steps ...

Embodiment 3

[0069] This example prepares an anti-oxidation coating for C / ZrC-SiC composite material, the specific process is as follows:

[0070] (1) Add 1mol B powder and 4.5mol Hf powder to 5mol ethanol, stir at room temperature for 30min; then add 4mol phenolic resin, place in a water bath at 50°C, stir mechanically for 15min, and prepare ceramic slurry (viscosity: 390mPa· s), then the ceramic slurry is brushed onto the surface of the C / ZrC-SiC composite matrix material;

[0071] (2) Put the composite material in (1) in a curing tank, pressurize to 1MPa, heat up to 200°C for 3 hours to make the ceramic slurry fully cross-linked and solidified, and then place it in a cracking furnace under argon gas Under atmosphere, pyrolyze at 1400°C for 3 hours;

[0072] (3) The composite material in (2) is placed in a deposition furnace, under the condition of 5kPa absolute pressure and 1000°C, trichloromethylsilane is passed through, and the deposition time is 20 hours;

[0073] (4) Repeat steps ...

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Abstract

The invention relates to an antioxidant coating for a C / ZrC-SiC composite material, and a preparation method thereof. The antioxidant coating comprises an HfC-HfB2 coating and a SiC coating which arealternately formed on the C / ZrC-SiC composite material. The preparation method comprises the following steps: the surface of the C / ZrC-SiC composite material is coated with a ceramic slurry containingHf powder, B powder, ethyl alcohol and phenolic resin, the HfC-HfB2 coating is formed after cracking, and then the SiC coating is deposited; and the above step is repeated (N-2) / 2 times so as to formthe antioxidant coating on the surface of the C / ZrC-SiC composite material. The method has the advantages of simple process, low preparation cost, solving of the problems of uniform distribution of HfC-HfB2 and SiC and combination with a matrix, remarkable improvement of the ablation resistance and oxidation resistance of the C / ZrC-SiC composite material, and further improvement of the use temperature of the C / ZrC-SiC composite material.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to an anti-oxidation coating for C / ZrC-SiC composite materials and a preparation method thereof. Background technique [0002] Carbon fiber toughened zirconium carbide-silicon carbide ceramic matrix composites (i.e. C / ZrC-SiC composites) are high-performance thermal structural materials. It overcomes the Achilles heel of brittleness of single-phase ceramic materials, and has excellent characteristics such as low density, high temperature resistance, high strength, oxidation resistance and ablation resistance. It can be used as aerospace thermal structural materials, and has been used in engine combustion chambers of new generation aircraft , Exhaust nozzles, and ends have been applied. ZrC and SiC in the matrix will be oxidized to ZrO in a long-term oxidation environment 2 , SiO 2 , when the use temperature is lower than 2200℃, ZrO 2 with SiO 2 form a vi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89
CPCC04B41/009C04B41/52C04B41/89C04B35/806C04B41/507C04B41/5057C04B41/4558C04B41/5059C04B41/4531
Inventor 裴雨辰刘伟吴朝军于艺宋环君金鑫刘俊鹏孙同臣
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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