Method for preparing high temperature oxidation resisting coating on surface of carbon material

A high-temperature anti-oxidation and carbon-based technology, which is applied in the field of preparing high-temperature anti-oxidation coatings on the surface of carbonaceous materials, can solve the problems of long cycle time and exhaust pollution, and achieve the goals of reducing micro-cracks, increasing bonding force, and enhancing anti-oxidation ability Effect

Active Publication Date: 2012-12-05
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing research to prepare XC coatings mainly adopts the method of chemical vapo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Oxidation-resistant Gradient Coating of Graphite Material SiC / TaC / SiO 2 preparation

[0022] 1) Preparation of slurry: 20g Si powder and 10g epoxy resin are mixed uniformly to obtain reaction slurry I; 30g epoxy resin and 10g Ta 2 o 5 Mix evenly to obtain the oxygen barrier layer slurry II;

[0023] 2) With a density of 1.8g / cm 3 The high-strength graphite is used as the base material, and a 2mm thick reaction slurry I is brushed on the graphite surface, and then sintered at a temperature of 1500°C for 1h; after the sintering is completed, it is naturally cooled to room temperature to obtain a silicon carbide (SiC) stress release layer, and then its surface is cleaned and dried;

[0024] 3) Apply 1 mm thick oxygen barrier layer slurry II on the surface of the silicon carbide (SiC) stress release layer of the graphite substrate obtained in step 2), and then gradually increase the temperature in a drying oven within the range of 50-150°C Drying and curing to remove t...

Embodiment 2

[0029] Oxidation-resistant Gradient Coating of Graphite Material SiC / HfC / SiO 2 preparation

[0030] 1) Preparation of slurry: 20g Si powder and 10g epoxy resin are mixed uniformly to obtain reaction slurry I; 30g phenolic resin and 20gHfO 2 Mix evenly to obtain the oxygen barrier layer slurry II;

[0031] 2) With a density of 1.9g / cm 3 The high-strength graphite is used as the base material, and 1.5mm thick reaction slurry I is brushed on the graphite surface, and then sintered at a temperature of 1500 ° C for 3 hours; after the sintering is completed, it is naturally cooled to room temperature to obtain a silicon carbide (SiC) stress release layer, and then Clean the surface and dry it;

[0032] 3) On the surface of the silicon carbide (SiC) stress release layer of the graphite substrate obtained in step 2), apply 1 mm of the oxygen barrier layer slurry II, and then gradually heat up and dry in a drying oven within the range of 50-150° C. Curing to remove the solvent and ...

Embodiment 3

[0037] Oxidation-resistant Gradient Coating SiC / ZrC / SiO for Carbon / Carbon Composite Materials 2 preparation

[0038] 1) Preparation of slurry: 20g Si powder and 20g epoxy resin are mixed uniformly to obtain reaction slurry I; 30g epoxy resin and 40gZrO 2 Mix evenly to obtain the oxygen barrier layer slurry II;

[0039] 2) With a density of 1.9g / cm 3 The carbon / carbon composite material is used as the substrate, and 1mm of reaction slurry I is brushed on the surface of the carbon / carbon composite material, and then sintered at a temperature of 1600°C for 1h; after sintering, it is naturally cooled to room temperature to obtain silicon carbide (SiC) stress Release the layer, then wash its surface and dry it;

[0040] 3) Apply 1mm of oxygen barrier layer slurry II on the surface of the silicon carbide (SiC) stress release layer of the carbon / carbon composite material obtained in step 2), and then dry it in a drying oven at 100°C for 1h to remove Solvent, and form a solid laye...

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Abstract

The invention relates to a method for preparing high temperature oxidation resisting coating on the surface of a carbon material, and belongs to the technical field of inorganic coating materials for carbon material oxidation protection. A reaction slurry is coated on the surface of the carbon material, is then sintered, then an oxygen blocking layer slurry is further coated, then the carbon material coated with the reaction slurry is further sintered, tetraethoxysilane is further painted, and then the drying operation is carried out. Through regulation of the relative content of refractory metal oxide and resin, the problem of mismatching of internal stress of a gradient coating is solved, microcrack is reduced, the binding force of the coating is enhanced, and the oxidation resistance of the coating is strengthened. A SiC stress release layer and an XC oxygen blocking layer can be mutually enclosed to reduce the microcrack caused by the difference of coefficients of thermal expansion, the melting point of XC is high, the XC is not easily washed by air flow and has a stabilizing effect on the SiC coating so as to prevent the SiC from being washed by the high temperature air flow to drop down; the XC oxygen blocking layer can go through a high-temperature antioxidation test; and a sealing layer is used for filling holes of the oxygen blocking layer.

Description

technical field [0001] The invention relates to a method for preparing a high-temperature oxidation-resistant coating on the surface of a carbonaceous material, and belongs to the technical field of inorganic coating materials for oxidation protection of carbon materials. Background technique [0002] Carbon materials have light weight, good thermal conductivity and strong impact resistance, especially carbon / carbon composite materials have very high mechanical properties in high temperature environments above 1700 ° C, and are widely used in aviation, aerospace, nuclear energy and other conditions Demanding high-tech fields. However, carbonaceous materials begin to oxidize in an aerobic environment at 450°C, which will fatally damage their mechanical properties. Anti-oxidation coating is an effective solution to the high-temperature thermal protection of carbon materials. However, for high-temperature aerobic environments higher than 1700 °C, single-layer coatings cannot m...

Claims

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Application Information

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IPC IPC(8): C04B41/89
Inventor 吴宁宁李同起张中伟冯志海李钰梅刘风亮俸翔
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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