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High-temperature anti-oxidation composite coating for thermal structural composite material 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 failure, and achieve the effects of small thermal damage, less volatilization, and convenient operation

Active Publication Date: 2020-01-17
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • High-temperature anti-oxidation composite coating for thermal structural composite material and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

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

[0023] Pre-oxidation: heat the thermal structural composite material at the first preset temperature for the first preset time, and then cool the thermal structural composite material naturally to room temperature after pre-oxidation. Specifically, the cleaned thermal structural composite material is put into a quartz tube or crucible with through holes at both ends, placed in a muffle furnace, and the tube body is placed in the constant temperature area in the middle of the furnace cavity, and the temperature is raised to about 900 ℃~1000℃, heat preservation for about 3min~6min, after reaching the pre-oxidation time, take the quartz tube out of the muffle furnace cavity, and let it cool naturally at room temperature. After the thermal structural composite materi...

Embodiment 1

[0028] Take the density as 1.75g / cm 3 The thermal structural 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 structural composite material sample is dried at 120°C for 15 hours stand-by.

[0029] Put the cleaned thermal structural composite material sample into a quartz tube with holes at both ends, use a program temperature control device to raise the temperature of the muffle furnace, set the pre-oxidation temperature to 900°C, and when the temperature of the muffle furnace rises to 900°C When the temperature is constant, put the quartz tube with thermal structural composite material into the muffle furnace, and place the tube body part with the sample in the middle of the furnace cavity, that is, the constant temperature area, to ensure that the pre-oxidation temperature of the sample is 900 ° C. The pre-oxidation time is 3min. After the pre-oxi...

Embodiment 2

[0034] Take the density as 1.75g / cm 3 The thermal structural 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 structural composite material sample is dried at 120°C for 20h stand-by.

[0035] Put the cleaned thermal structural composite material sample into a quartz tube with holes at both ends, use a program temperature control device to raise the temperature of the muffle furnace, set the pre-oxidation temperature to 950°C, and when the temperature of the muffle furnace rises to 950°C And when it is constant, put the quartz tube with thermal structural composite material into the muffle furnace, and the tube body part with the sample placed in the middle of the furnace cavity, that is, the constant temperature area, to ensure that the pre-oxidation temperature of the sample is 950 °C, The pre-oxidation time is 6min. After the pre-oxidation time is up, ...

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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 anti-oxidation composite coating for thermal structural composite materials and a preparation method thereof. Background technique [0002] Thermostructural composites are composite materials that have mechanical properties that make them suitable for use in the construction of structural elements and that have the ability to maintain these properties at high temperatures. Such thermal structural materials consist in particular of carbon / carbon (C / C) composites (carbon fiber reinforcement and carbon matrix) and of ceramic matrix composites such as C / SiC materials (carbon fiber reinforcement with silicon carbide matrix ), C / C-SiC materials (carbon fiber reinforced materials with a mixed matrix of carbon and silicon carbide), or even SiC / SiC materials. [0003] Thermal structural composite materials have excellent high-temperature physical properties, such as low densit...

Claims

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Application Information

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Patent Type & Authority Patents(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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