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A kind of carbon/carbon composite material surface wide temperature range composite anti-oxidation coating and preparation method

A carbon composite material, anti-oxidation coating technology, applied in the field of anti-oxidative coating preparation, can solve the problems of ineffective healing of the coating, poor fluidity, lack of evaluation, etc.

Active Publication Date: 2022-07-05
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the service temperature of the above-mentioned silicon-based ceramic coatings is mostly concentrated in the high temperature environment of 1773 K, and the evaluation in a wide temperature range is lacking, and the SiO 2 Higher viscosity and poor fluidity at lower temperatures cannot effectively heal the defects of the coating during use, resulting in poor oxidation protection performance of silicon-based ceramics at low temperatures

Method used

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  • A kind of carbon/carbon composite material surface wide temperature range composite anti-oxidation coating and preparation method
  • A kind of carbon/carbon composite material surface wide temperature range composite anti-oxidation coating and preparation method
  • A kind of carbon/carbon composite material surface wide temperature range composite anti-oxidation coating and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Weigh a certain amount of phenolic resin in a beaker, add a certain amount of absolute ethanol to it, wherein the mass ratio of phenolic resin to absolute ethanol is 1:9, and stir it evenly after ultrasonic treatment to obtain a phenolic resin solution. A;

[0033] (2) Weigh a certain amount of B powder into a beaker, add a certain amount of silica sol to it, wherein the mass ratio of silica sol to B powder is 8:2, and stir it evenly to obtain a suspension liquid slurry after ultrasonic treatment. B;

[0034] (3) Add SiC powder to the phenolic resin solution A, stir evenly to obtain a slurry C, in which the mass fraction of SiC is 40 wt%; add TiB to the phenolic resin solution A 2 and SiC powder, in which the mass fraction of SiC is 30 wt%, TiB 2 The mass fraction is 10 wt%, and the slurry D is obtained after stirring evenly;

[0035] (4) Dip the C / C composite into slurry C for 5 s, take it out and dry it in an oven at 60 °C for 30 min. After repeating this proce...

Embodiment 2

[0040] (1) Weigh a certain amount of phenolic resin in a beaker, add a certain amount of absolute ethanol to it, wherein the mass ratio of phenolic resin to absolute ethanol is 2:8, and stir it evenly after ultrasonic treatment to obtain a phenolic resin solution. A;

[0041] (2) Weigh a certain amount of B powder into a beaker, add a certain amount of silica sol to it, wherein the mass ratio of silica sol to B powder is 8:2, and stir it evenly to obtain a suspension liquid slurry after ultrasonic treatment. B;

[0042] (3) Add SiC powder to the phenolic resin solution A, stir evenly to obtain a slurry C, in which the mass fraction of SiC is 30 wt%; add TiB to the phenolic resin solution A 2 and SiC powder, in which the mass fraction of SiC is 20 wt%, TiB 2 The mass fraction is 20 wt%, and the slurry D is obtained after stirring evenly;

[0043] (4) Dip the C / C composite into slurry C for 10 s, take it out and dry it in an oven at 90 °C for 10 min. After repeating this proc...

Embodiment 3

[0048] (1) Weigh a certain amount of phenolic resin in a beaker, add a certain amount of absolute ethanol to it, wherein the mass ratio of phenolic resin to absolute ethanol is 1:9, and stir it evenly after ultrasonic treatment to obtain a phenolic resin solution. A;

[0049] (2) Weigh a certain amount of B powder into a beaker, add a certain amount of silica sol to it, wherein the mass ratio of silica sol and B powder is 9:1, after ultrasonic treatment, stir evenly to obtain a suspension liquid slurry B;

[0050] (3) Add SiC powder to the phenolic resin solution A, stir evenly to obtain a slurry C, in which the mass fraction of SiC is 35 wt%; add TiB to the phenolic resin solution A 2 and SiC powder, in which the mass fraction of SiC is 25 wt%, TiB 2 The mass fraction is 15 wt%, and the slurry D is obtained after stirring evenly;

[0051] (4) Dip the C / C composite into slurry C for 8 s, take it out, and dry it in an oven at 80 °C for 20 min. After repeating this process th...

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Abstract

The invention relates to a wide temperature range composite anti-oxidation coating on the surface of carbon / carbon composite materials and a preparation method. 2 ‑SiC‑Si / SiC‑Si / SiO 2 ‑B Multi-layer composite anti-oxidant coating. Outermost layer B‑SiO 2 As a sealing layer, it fills cracks and produces low-melting borosilicate glass at temperatures below 900℃, which can effectively heal defects such as cracks; the outer SiC-Si ceramic coating acts as a barrier layer, which not only has good resistance at 1500℃ Oxidation, and avoid excessive low melting point phase at high temperature; TiB 2 The ‑SiC‑Si layer acts as an intermediate layer to rapidly oxidize at 1300℃ to seal cracks with a low melting point phase; the innermost SiC‑Si ceramic coating acts as a transition layer to alleviate the mismatch of thermal expansion coefficients. The composite coating sample only loses 0.18% in weight after oxidizing at 900℃ for 182h, gains 0.26% in weight after oxidizing at 1300℃ for 164h, and gains 0.32% in weight after oxidizing at 1500℃ for 196h.

Description

technical field [0001] The invention belongs to the technical field of preparation of anti-oxidation coatings, relates to a wide temperature range composite anti-oxidation coating on the surface of carbon / carbon composite materials and a preparation method, in particular to a SiC-Si / TiB 2 -SiC-Si / SiC-Si / SiO 2 -B wide temperature range composite anti-oxidation coating and preparation method thereof. Background technique [0002] Carbon / carbon (C / C) composites have excellent properties such as high specific strength, low coefficient of thermal expansion, and high temperature resistance, especially at ultra-high temperatures, they can still maintain high strength, making them widely used in high-temperature aerospace fields. structural components. However, the easy oxidation of C / C composites in an aerobic environment over 370 °C will lead to a rapid decline in their mechanical properties and various physical and chemical properties. The key to cutting-edge weapons and engin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
CPCC04B41/009C04B41/52C04B41/89C04B35/83C04B41/5059C04B41/4823C04B41/4539C04B41/4554C04B41/0072C04B41/507C04B41/524C04B41/5096C04B41/457C04B41/4529C04B41/5089C04B41/5094C04B41/4537
Inventor 付前刚周磊李贺军张佳平丁伍庆侯佳琪
Owner NORTHWESTERN POLYTECHNICAL UNIV