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Thermal structure composite material high-temperature anti-oxidation composite coating and preparation method thereof

A high-temperature anti-oxidation and composite material technology, applied in the field of materials, can solve problems such as coating surface cracks and coating failures, and achieve the effects of less thermal damage, less volatilization and low preparation cost

Active Publication Date: 2017-07-21
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after a long time of oxidation, cracks still appear on the surface of the coating, which leads to the failure of the coating.

Method used

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  • Thermal structure composite material high-temperature anti-oxidation composite coating and preparation method thereof

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Effect test

preparation example Construction

[0022] The method for preparing a high-temperature oxidation-resistant composite coating of a thermal structure composite material according to an embodiment of the present invention mainly includes the following steps.

[0023] Pre-oxidation: The thermal structure composite material is kept at a first preset temperature for the first preset time, and after pre-oxidation, the thermal structure composite material is naturally cooled to room temperature. Specifically, the cleaned thermal structure composite material is placed in a quartz tube or crucible with through holes at both ends, and placed in a muffle furnace. As for the constant temperature zone in the middle of the furnace cavity, the tube body is heated to about 900 ℃~1000℃, heat preservation is about 3min~6min, after reaching the pre-oxidation time, take out the quartz tube from the muffle furnace cavity, and let it cool naturally in room temperature environment. After the thermal structure composite material is pre-oxi...

Embodiment 1

[0028] Take the density as 1.75g / cm 3 The thermal structure composite material is processed into a sample of 10mm×10mm×10mm, polished with SiC sandpaper, and ultrasonically cleaned in absolute ethanol for 15 minutes; the cleaned thermal structure composite sample is dried at a temperature of 120°C for 15 hours stand-by.

[0029] Put the cleaned thermal structure composite material sample into the quartz tube with through holes at both ends, and use the program temperature control device to heat up the muffle furnace. The pre-oxidation temperature is set to 900℃. When the muffle furnace temperature rises to 900℃ When it is constant, put the quartz tube containing the thermal structure composite material into the muffle furnace, and the part of the tube body with the sample is placed in the middle of the furnace cavity, that is, the constant temperature zone, and the pre-oxidation temperature of the sample is 900 ℃. The pre-oxidation time is 3min. After the pre-oxidation time is r...

Embodiment 2

[0034] Take the density as 1.75g / cm 3 The thermal structure composite material is processed into a sample of 10mm×10mm×10mm, polished with SiC sandpaper, and ultrasonically cleaned in absolute ethanol for 25min; the cleaned thermal structure composite sample is dried at a temperature of 120℃ for 20h stand-by.

[0035] Put the cleaned thermal structure composite material sample into the quartz tube with through holes at both ends, and use the program temperature control device to heat up the muffle furnace. The pre-oxidation temperature is set to 950℃. When the muffle furnace temperature rises to 950℃ When it is constant, put the quartz tube containing the thermal structure composite material into the muffle furnace, and the part of the tube body with the sample is placed in the middle of the furnace cavity, that is, the constant temperature zone, and the pre-oxidation temperature of the sample is 950℃. The pre-oxidation time is 6min. After the pre-oxidation time is reached, the ...

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Abstract

The present invention relates to a thermal structure composite material high-temperature anti-oxidation composite coating and a preparation method thereof. The preparation method comprises: carrying out thermal insulation on a thermal structure composite material for a first preset time at a first preset temperature, carrying out pre-oxidation, and naturally cooling the thermal structure composite material to a room temperature; under a protection atmosphere, embedding the thermal structure composite material into an embedding powder material, and carrying out thermal insulation for a second preset time at a second preset temperature to obtain a thermal structure composite material having a SiC coating; and spraying a spraying powder material onto the thermal structure composite material having the SiC coating under a preset voltage and a preset current by using a plasma spraying method to obtain the Si-Yb2Si2O7-ZrB2 coating. According to the present invention, the preparation method has advantages of simple preparation process, convenient operation, easily available raw material, and low preparation cost.

Description

Technical field [0001] The invention relates to the field of materials, in particular, to a high-temperature oxidation-resistant composite coating of a thermal structure composite material and a preparation method thereof. Background technique [0002] Thermal structural composite materials are composite materials that have mechanical properties that make them suitable for constructing structural elements and have the ability to maintain these properties at high temperatures. This thermal structure material is especially composed of carbon / carbon (C / C) composite materials (carbon fiber reinforcement and carbon matrix), as well as ceramic matrix composite materials, such as C / SiC material (carbon fiber reinforcement material with a silicon carbide matrix) ), C / C-SiC material (carbon fiber reinforced material with a mixed matrix of carbon and silicon carbide) or even SiC / SiC material. [0003] Thermal structural composites have excellent high-temperature physical properties, such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89
CPCC04B41/009C04B41/52C04B41/89C04B41/5059C04B41/4545C04B35/66
Inventor 罗瑞盈茅振国
Owner BEIHANG UNIV
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