High-strength silicon carbide foam ceramic and one-time pulp hanging carburizing sintering preparation method thereof

A foamed ceramic and silicon carbide technology, which is applied in the field of silicon carbide foamed ceramic preparation, can solve the problems of low strength, unfavorable application, and easily damaged structure, and achieves the effects of increased strength, less plugging, and low equipment requirements.

Inactive Publication Date: 2019-01-04
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After pyrolysis, the foam matrix has SiC, Al 2 o 3 and Y 2 o 3 Composition, the particles only rely on physical accumulation to combine with each other, the strength is low, and the structure is easily destroyed, which is not conducive to application

Method used

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  • High-strength silicon carbide foam ceramic and one-time pulp hanging carburizing sintering preparation method thereof
  • High-strength silicon carbide foam ceramic and one-time pulp hanging carburizing sintering preparation method thereof
  • High-strength silicon carbide foam ceramic and one-time pulp hanging carburizing sintering preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The method for preparing high-strength silicon carbide foam ceramics by one-time slurry carbonization and sintering comprises the following steps:

[0032] (1) Use high carbon residue phenolic resin, silicon powder (particle size d 50 =1μm) and sintering aid are mixed at a mass ratio of 20wt%: 75wt%: 5wt%, and the sintering aid is Y 2 o 3 and Al 2 o 3 Mix at a molar ratio of 3:5, add 80mL of alcohol (technical grade alcohol, the following examples are the same here), ball mill for 12 hours, and then stir and degas under vacuum for about 10 minutes;

[0033] (2) Take the polyurethane foam, cut it into a rectangular shape, soak it in the slurry, then remove the excess slurry by centrifugation, put it in an oven and keep it warm at 60°C for 3 hours, after the sample is dried, repeat the slurrying and centrifugation and drying operation steps 5 times;

[0034] (3) Place the foam after slurrying in a tube furnace, and carry out pyrolysis under a nitrogen atmosphere. The...

Embodiment 2

[0037] The method for preparing high-strength silicon carbide foam ceramics by one-time slurry carbonization and sintering comprises the following steps:

[0038] (1) With phenolic resin, silicon powder (particle size d 50 =3μm) and sintering aid SiO 2 Mix at a mass ratio of 30wt%: 60wt%: 10wt%, add 70mL of alcohol, ball mill for 24 hours, then stir and degas under vacuum for about 10 minutes;

[0039] (2) Take the polyurethane foam, cut it into a rectangular shape, dip into the slurry, then remove the excess slurry by centrifugation, and place it in an oven at 60°C for 6 hours. After the sample is dried, repeat the above slurry, Operation steps of centrifugation and drying 5 times;

[0040] (3) Place the foam after slurrying in a tube furnace, and perform pyrolysis under a nitrogen atmosphere at a heating rate of 0.8°C / min, from room temperature to 900°C, and keep it warm for 4 hours to obtain pyrolytic charcoal, Foam ceramic carbon skeleton composed of sintering aid and s...

Embodiment 3

[0043] The method for preparing high-strength silicon carbide foam ceramics by one-time slurry carbonization sintering may further comprise the steps:

[0044] (1) Aminophenolic resin, silicon powder (particle size d 50 =5μm) and sintering aid are mixed at a mass ratio of 10wt%: 85wt%: 5wt%, and the sintering aid is SiO 2 and Al 2 o 3 Add 85mL of alcohol to the mixture, ball mill for 24 hours, then stir and degas under vacuum for about 10 minutes;

[0045] (2) Take the polyurethane foam, cut it into a rectangular shape, soak the slurry, then remove the excess slurry by centrifugation, place it in an oven and keep it warm at 80°C for 3 hours, after the sample is dried, repeat the above slurry, Operation steps of centrifugation and drying 5 times;

[0046] (3) Put the slurry-coated foam in a tube furnace and carry out pyrolysis under a nitrogen atmosphere at a heating rate of 1°C / min to 1000°C for 2 hours to obtain pyrolytic carbon and sintering aids And the foam ceramic ca...

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Abstract

The invention discloses high-strength silicon carbide foam ceramic and a one-time pulp hanging carburizing sintering preparation method thereof, and belongs to the technical field of silicon carbide foam ceramic preparation. The method comprises the steps that foamed plastic serves as a template, a one-time pulp hanging carburizing sintering method is adopted, high-char polymer resin, silicon powder, sintering aids and ethyl alcohol are mixed to be prepared into pulp with certain viscosity, the foamed plastic is immersed in the pulp and then taken out, then surplus pulp is removed through a centrifugal method, drying is conducted in the shade, and then pulp hanging is repeated until the needed volume fraction is reached; a foam precursor obtained after pulp hanging is put into a tubular furnace to be subjected to pyrolysis carbonization in a nitrogen or argon atmosphere, a foam ceramic carbon precursor framework formed by pyrolytic carbon, the silicon powder and the sintering aids is obtained, the foam ceramic carbon precursor framework is put in an atmosphere furnace to be sintered, and the high-strength SiC foam ceramic is obtained. Compared with a traditional template method, the method is simple in technology, mild in reaction condition, low in equipment requirement and capable of achieving large-scale production easily.

Description

technical field [0001] The invention belongs to the technical field of preparing silicon carbide foam ceramics, and in particular relates to a method for preparing high-strength silicon carbide foam ceramics by adopting a one-time paste-hanging carbonization and sintering method. Background technique [0002] Silicon carbide (SiC) foam ceramics combines the excellent physical and chemical properties of SiC ceramics with the high porosity, permeability, developed specific surface area, energy absorption performance, low density and low thermal conductivity of foam materials. It has a wide range of applications in thermal, biomedical, electronic devices, aerospace, energy and chemical industries. [0003] The traditional template method to prepare SiC foam ceramics is divided into liquid phase siliconization method and reaction sintering method. The general steps of the liquid phase siliconizing method are: slurry preparation → slurry coating → pyrolysis carbonization → liqui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/573C04B38/06
CPCC04B35/573C04B38/0615C04B2235/428C04B2235/48C04B2235/6562C04B2235/6567C04B2235/658
Inventor 史忠旗杨必果张哲健夏鸿雁王继平王红洁杨建锋
Owner XI AN JIAOTONG UNIV
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