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Anti-oxidation HfC/SiC foam and preparation method thereof

An anti-oxidation and foam technology, which is applied in the field of foam ceramics, can solve problems such as the decline of foam anti-oxidation ability, achieve the effects of improving anti-oxidation ability and heat resistance, increasing anti-oxidation temperature, and improving anti-oxidation performance

Active Publication Date: 2018-05-04
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above scheme does not consider that in actual use, when the anti-oxidation layer is lost, the SiC foam body will still be exposed to high temperature and oxidative environment, and the anti-oxidation ability of the foam will be greatly reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1. Preparation of mixed slurry

[0052] Dissolving phenolic resin and polyethylene glycol in absolute ethanol, adding silicon hafnium alloy powder and ball milling to obtain a slurry, 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-hafnium 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-hafnium alloy is 5%, the mass fraction of hafnium is 95%, and the particle size of the silicon-hafnium alloy powder is 100nm-1μm.

[0053] 2. Vacuum impregnation

[0054] 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.

[0055] 3. Pressure curing

[0056] The foam impregnated with the slurry ...

Embodiment 2、3

[0064] The mass ratios of phenolic resin to silicon-hafnium alloy powder are 6:1 and 15:1 respectively, and the rest of the preparation is the same as in Example 1. The mass ratios of HfC and SiC in the HfC / SiC composite foams obtained in Examples 2 and 3 are both 14:1, and the mass loss rates after static oxidation test at 1600°C for 1 hour are 0.22‰ and 0.33‰ respectively, and the compressive strengths at room temperature are 52MPa and 0.33‰ respectively. 41MPa.

[0065] According to Examples 1, 2, and 3, it can be seen that, with other conditions unchanged, the more silicon-hafnium alloys are present, the higher the oxidation resistance and mechanical properties of the final composite foam.

Embodiment 4、5

[0067] The mass fractions of silicon in the silicon-hafnium alloy were 10% and 25%, and the mass fractions of hafnium were 90% and 75%, respectively. The rest of the preparation was the same as in Example 1. The mass ratios of HfC and SiC in the HfC / SiC composite foams obtained in Examples 4 and 5 were 7:1 and 2:1 respectively, and the mass loss rates were 0.32‰ and 0.41‰ after the static oxidation test at 1600°C for 1 hour, and the compressive strength at room temperature They are 41MPa and 33MPa respectively.

[0068] According to Examples 1, 4, and 5, it can be seen that, with other conditions unchanged, the more hafnium contained in the silicon-hafnium alloy, the higher the oxidation resistance and mechanical properties of the final composite foam.

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Abstract

The invention provides anti-oxidation HfC / SiC foam and a preparation method thereof. Organic foam is impregnated with mixed slurry, a silicon-hafnium alloy is introduced into the organic foam, cracking and melting reactions are performed, so that the silicon-hafnium alloy homogenously distributed in the foam reacts with carbon, and SiC and HfC are produced in situ. Starting from a foam body, refractory metal Hf is introduced into the body while a carbon precursor is introduced, HfC / SiC composite foam is formed, an HfO2 and SiO2 composite protective membrane is formed on the surface in a high-temperature aerobic environment, and the oxidation resistance of the foam is improved under the synergistic effect of two oxides.

Description

technical field [0001] The invention relates to an anti-oxidation HfC / SiC foam and a preparation method thereof, belonging to the technical field of foam ceramics. Background technique [0002] SiC ceramic foam is an inorganic non-metallic material with many pores in its internal structure. In addition to high porosity and large specific surface area, it also has the characteristics of low relative density, light weight, high strength, temperature resistance and corrosion resistance, and low thermal expansion. It can be prepared Porous media burners, catalyst carriers, molten metal filters and other types of high-temperature resistant devices have broad application prospects in the fields of environmental protection, chemical industry, metallurgy, and energy. [0003] At present, the main preparation methods of SiC foam ceramics include powder sintering method, solid state reaction sintering method, silicon resin pyrolysis method, and vapor phase deposition method. Most of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/634C04B38/06C04B35/653
CPCC04B35/5622C04B35/63456C04B35/63476C04B35/653C04B38/0615C04B2235/3826C04B2235/658C04B2235/48C04B2235/9684
Inventor 左红军陈艳武霍鹏飞张万强孙同臣金鑫刘俊鹏于新民王涛
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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