Lightweight and high-strength silicon carbide foamed ceramic and preparation method thereof

A foamed ceramic and silicon carbide technology, which is applied in the field of lightweight and high-strength silicon carbide foamed ceramics and its preparation, can solve the problems of uneven composition, cumbersome preparation process and high experimental cost

Active Publication Date: 2020-10-23
咸阳瞪羚谷新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method mainly relies on the residual silicon remaining after reaction sintering as a binder and adding sintering aids to improve the strength of SiC foam ceramics. The preparation process is relatively cumbersome, the experimental cost is high, and the product is prone to uneven composition.
In addition, the introduction of sintering aids also greatly limits the application fields of SiC foam ceramics

Method used

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  • Lightweight and high-strength silicon carbide foamed ceramic and preparation method thereof
  • Lightweight and high-strength silicon carbide foamed ceramic and preparation method thereof
  • Lightweight and high-strength silicon carbide foamed ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare the slurry according to the molar ratio of absolute ethanol to phenolic resin 1:0.3, place the 50PPI polyurethane foam formwork in the uniformly mixed slurry and fully knead and impregnate it, and discharge the excess slurry by roller pressing Dry in the shade at room temperature for 24 hours. The prepared foam precursor was placed in a tube furnace, filled with argon, and heated to 1000 °C at a heating rate of 1 °C / min for 2 h. Place the pyrolytic carbonized foam carbon skeleton in the middle layer of the crucible, spread a layer of SiO powder on the bottom of the crucible, the quality of SiO powder is 6 times the mass of the foam carbon skeleton, and then place the crucible in the furnace body and pass it into Under argon atmosphere pressure, the temperature was raised to 1750°C at a heating rate of 5°C / min, and kept for 4 hours.

[0033] The macroscopic morphology of the prepared SiC foam ceramics is as follows: figure 2 shown. From figure 2 It can be s...

Embodiment 2

[0035] Prepare the slurry according to the molar ratio of absolute ethanol and phenolic resin at 1:1, place the 65PPI polyurethane foam formwork in the evenly mixed slurry and fully knead and impregnate it, and discharge the excess slurry by roller pressing Dry in the shade at room temperature for 24 hours. The prepared foam precursor was placed in a tube furnace, filled with argon, and heated to 1000 °C at a heating rate of 1 °C / min for 2 h. Place the pyrolysis carbonized foam carbon skeleton in the middle layer of the crucible, spread a layer of SiO powder on the bottom of the crucible, the quality of SiO powder is 10 times the mass of the foam carbon skeleton, and then place the crucible in the furnace body and pass through Argon atmosphere pressure, the temperature of the sintering furnace was raised to 1800°C at a heating rate of 5°C / min, and the temperature was kept for 4h.

Embodiment 3

[0037] Prepare the slurry according to the molar ratio of absolute ethanol to phenolic resin of 1:0.5, place the 20PPI polyurethane foam formwork in the uniformly mixed slurry and fully knead and impregnate it, and discharge the excess slurry by roller pressing Dry in the shade at room temperature for 24 hours. The prepared foam precursor was placed in a tube furnace, filled with argon, and heated to 1000 °C at a heating rate of 1 °C / min for 4 h. Place the pyrolysis carbonized foam carbon skeleton in the middle layer of the crucible, spread a layer of SiO powder on the bottom of the crucible, the quality of SiO powder is 8 times the mass of the foam carbon skeleton, then place the crucible in the furnace body and pass through Under the pressure of argon atmosphere, the temperature was raised to 1650°C at a heating rate of 5°C / min, and kept for 6 hours.

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Abstract

The invention discloses lightweight and high-strength silicon carbide foamed ceramic and a preparation method thereof, and belongs to the technical field of foamed ceramic preparation. Polyurethane foam is used as a template, and high-carbon-residue resin and absolute ethyl alcohol are uniformly mixed to prepare slurry with different viscosities. A foamy carbon precursor with a controllable pore rib structure and strength is obtained through the steps of slurry hanging, drying and pyrolysis carbonization, and then the lightweight and high-strength silicon carbide foamed ceramic is prepared through in-situ gas-solid carbon thermal reduction reaction sintering. Compared with a traditional template method, the method of the invention has the following advantages that the residual carbon amount of a carbonized foamy carbon skeleton is regulated by controlling the slurry hanging amount, so that the pore rib structure, porosity and strength of the silicon carbide foamed ceramic product are controlled. The silicon carbide foamed ceramic prepared by the method is of a three-dimensional open-pore internet-shaped skeleton structure, and has the structural characteristics of hollow pore rib core part, smooth and compact pore rib wall and the like, and the product has the characteristics of light weight and high strength.

Description

technical field [0001] The invention belongs to the technical field of foam ceramic preparation, and in particular relates to a lightweight high-strength silicon carbide foam ceramic and a preparation method thereof. Background technique [0002] Silicon carbide (SiC) foam ceramics has excellent properties such as high porosity (70%-95%), low density, high specific surface area, high permeability, high temperature resistance, corrosion resistance and oxidation resistance, and can be used as catalyst carrier, molten metal Filters, composite reinforcement phases and artificial joints and other devices / components are widely used in filtration and catalysis, thermal insulation, biomedical, electronic devices, aerospace and energy and chemical industries. [0003] The experimental process of preparing SiC foam ceramics by traditional organic template impregnation method is mixing, slurrying, drying, pyrolysis carbonization and sintering. The specific slurry composition is mainly ...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B38/06
CPCC04B35/573C04B38/0615C04B2235/3418C04B2235/48C04B2235/6562C04B2235/6567C04B2235/6586C04B2235/77C04B2235/96C04B38/0067C04B38/0074
Inventor 史忠旗袁媛魏智磊周小楠王波夏鸿雁
Owner 咸阳瞪羚谷新材料科技有限公司
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