Oxidation-resistant SiC foam and preparation method thereof

An anti-oxidation and foam technology, applied in the field of foam ceramics, can solve the problems of poor film coating and oxidation of the foam body, achieve high anti-oxidation ability and heat resistance, improve anti-oxidation ability and heat resistance, and improve anti-oxidation performance. Effect

Active Publication Date: 2018-02-06
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN104261871 provides a ZrC foam, which is prepared by infiltration process, and the main component is ZrC, which will be oxidized to ZrO in a high-temperature aerobic environment 2 , due to ZrO 2 The film coverage of the foam is poor, and there will be a large number of gaps on the oxide film on the foam surface, which will lead to further oxidation of the foam body

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1. Preparation of mixed slurry

[0051] Dissolve phenolic resin and polyethylene glycol in absolute ethanol, add silicon-zirconium alloy powder and ball mill to obtain slurry, and the ball milling time is 18 hours. The mass ratio of phenolic resin to polyethylene glycol is 30:1, and the mass ratio of phenolic resin to silicon-zirconium alloy powder is 5:1; the viscosity of the slurry is adjusted to 100-200mPa·s by the content of absolute ethanol. The mass fraction of silicon in the silicon-zirconium alloy is 20%, the mass fraction of zirconium is 80%, and the particle size of the silicon-zirconium alloy powder is 100nm-1μm.

[0052] 2. Vacuum impregnation

[0053] The method of vacuum impregnation is used to impregnate the polyurethane foam into the slurry, so that the slurry is impregnated into the foam. The relative vacuum degree during vacuum impregnation is -0.0995MPa, and the time is 1 hour.

[0054] 3. Pressure curing

[0055] The foam impregnated with the slu...

Embodiment 2

[0063] 1. Preparation of mixed slurry

[0064] Dissolve phenolic resin and polyethylene glycol in absolute ethanol, add silicon-zirconium alloy powder and ball mill to obtain slurry, and the ball milling time is 18 hours. The mass ratio of phenolic resin to polyethylene glycol is 30:1, and the mass ratio of phenolic resin to silicon-zirconium alloy powder is 10:1; the viscosity of the slurry is adjusted to 100-200mPa·s by the content of absolute ethanol. The mass fraction of silicon in the silicon-zirconium alloy is 20%, the mass fraction of zirconium is 80%, and the particle size of the silicon-zirconium alloy powder is 100nm-1μm.

[0065] 2. Vacuum impregnation

[0066] The method of vacuum impregnation is used to impregnate the polyurethane foam into the slurry, so that the slurry is impregnated into the foam. The relative vacuum degree during vacuum impregnation is -0.0995MPa, and the time is 1 hour.

[0067] 3. Pressure curing

[0068] The foam impregnated with the sl...

Embodiment 3

[0076] 1. Preparation of mixed slurry

[0077] Dissolve phenolic resin and polyethylene glycol in absolute ethanol, add silicon-zirconium alloy powder and ball mill to obtain slurry, and the ball milling time is 18 hours. The mass ratio of phenolic resin to polyethylene glycol is 30:1, and the mass ratio of phenolic resin to silicon-zirconium alloy powder is 5:1; the viscosity of the slurry is adjusted to 100-200mPa·s by the content of absolute ethanol. The mass fraction of silicon in the silicon-zirconium alloy is 10%, the mass fraction of zirconium is 90%, and the particle size of the silicon-zirconium alloy powder is 100nm-1μm.

[0078] 2. Vacuum impregnation

[0079] The method of vacuum impregnation is used to impregnate the polyurethane foam into the slurry, so that the slurry is impregnated into the foam. The relative vacuum degree during vacuum impregnation is -0.0995MPa, and the time is 1 hour.

[0080] 3. Pressure curing

[0081] The foam impregnated with the slu...

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Abstract

The invention provides oxidation-resistant SiC foam and a preparation method thereof. Organic foam is impregnated in mixed slurry, a Si-Zr alloy is introduced into the organic foam, the Si-Zr alloy homogeneously distributed in the foam reacts with C through a cracking reaction and a melting reaction, and SiC and ZrC are generated in situ. Starting from the foam body, refractory metal Zr is introduced into the body during introduction of a C precursor, ZrC-SiC compound foam is formed, a ZrO2-SiO2 composite protective film is formed on the surface of the compound foam in a high-temperature aerobic environment, and the oxidation resistance of the whole SiC foam is improved under the synergistic effect of the two oxides; the preferable proportion range of Si and Zr in Si-Zr alloy powder is determined, the synergistic effect of the two oxides is exerted sufficiently, and the oxidation resistance and the heat resistance of the SiC foam material are improved.

Description

technical field [0001] The invention relates to an anti-oxidation SiC foam and a preparation method thereof, belonging to the technical field of foam ceramics. Background technique [0002] Due to the advantages of high temperature resistance, corrosion resistance, low thermal conductivity and low thermal expansion coefficient, SiC foam ceramics have received more and more attention, and are widely used in molten metal filtration, thermal isolation equipment, porous media burners, catalyst carriers, automobiles, etc. Exhaust gas purification and heat exchangers and other fields. [0003] The main preparation methods include: powder sintering method, reaction sintering method, precursor cracking method and vapor phase deposition method, etc. The prepared SiC foam ceramics are mostly pure SiC foam. When used under high temperature and oxidizing environment conditions, the surface of SiC foam will be oxidized to form SiO 2 A protective film that prevents further oxidation ins...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/56C04B35/65
CPCC04B35/5622C04B35/65C04B38/0615C04B2235/3826C04B2235/48C04B2235/96C04B2235/9684
Inventor 霍鹏飞左红军马宇亮李晓东于新民孔英杰
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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