Method for preparing high-performance foamed ceramic by combining template method with chemical vapor infiltration method

A technology of chemical vapor infiltration and foamed ceramics, applied in the field of foamed ceramics preparation, can solve the problems of high sintering temperature, unfavorable for large-scale industrial production, low strength, etc.

Pending Publication Date: 2020-11-13
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The firing temperature of this method is too high, which is not conducive to large-scale industrial production, and the compressive strength is less than 1MPa, which is low in strength and limited in application

Method used

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  • Method for preparing high-performance foamed ceramic by combining template method with chemical vapor infiltration method
  • Method for preparing high-performance foamed ceramic by combining template method with chemical vapor infiltration method
  • Method for preparing high-performance foamed ceramic by combining template method with chemical vapor infiltration method

Examples

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Effect test

Embodiment 1

[0048] The method for preparing high-performance silicon carbide foamed ceramics by template method combined with chemical vapor infiltration process comprises the following steps:

[0049] (1) With high-purity silicon carbide powder (particle size d50=0.05 μm, purity: 99%) and ethanol, binder, defoamer, plasticizer, dispersant, with a mass ratio of 30wt%: 60wt%: 3wt%: 2wt%: 3wt%: 2wt% After mixing, put it into a ball mill jar and mill it for 12 hours;

[0050] (2) Take the polyurethane foam and cut it into a cube shape as a template, soak the slurry, then remove the excess slurry by extrusion, place it in an air environment at 30°C for 72 hours, make it fully dry, and obtain a foam prefabricated body;

[0051] (3) Place the foam prefabricated body after slurry drying in a tube furnace, and perform pyrolysis-oxidation treatment in an air atmosphere at a heating rate of 0.5°C / min, from room temperature to 300°C, and keep it warm for 2 hours. Then continue to heat up to 450°C a...

Embodiment 2

[0055] The method for preparing high-performance silicon carbide foamed ceramics by template method combined with chemical vapor infiltration process comprises the following steps:

[0056] (1) Silicon carbide whiskers (diameter = 1 μm, aspect ratio 10-15, purity: 99%) and ethanol, methyl ethyl ketone, binder, defoamer, plasticizer, dispersant, with a mass ratio of 30wt %: 30wt%: 30wt%: 3wt%: 2wt%: 3wt%: 2wt% After mixing, put it into a ball mill jar and mill it for 18 hours;

[0057] (2) Take the polyurethane foam and cut it into a cube shape as a template, soak the slurry, then remove the excess slurry by extrusion, place it in a drying oven at 50°C for 48 hours, make it fully dry, and obtain a foam prefabricated body;

[0058] (3) Place the foam prefabricated body after slurry drying in a tube furnace, and perform pyrolysis-oxidation treatment in an air atmosphere at a heating rate of 0.5°C / min, from room temperature to 300°C, and keep it warm for 2 hours. Then continue to...

Embodiment 3

[0063] The method for preparing high-performance silicon nitride foamed ceramics by template method combined with chemical vapor infiltration process comprises the following steps:

[0064] (1) Silicon nitride whiskers (diameter = 1 μm, aspect ratio 5-10, purity: 95%) and ethanol, methyl ethyl ketone, toluene, binder, defoamer, plasticizer, dispersant, and Mass ratio 40wt%: 15wt%: 15wt%: 15wt%: 4wt%: 3wt%: 4wt%: 4wt% After mixing, put it into a ball mill jar and mill for 12 hours;

[0065] (2) Take the polyurethane foam and cut it into a cube shape as a template, soak the slurry, then remove the excess slurry by extrusion, place it in an air environment at 30°C for 72 hours, make it fully dry, and obtain a foam prefabricated body;

[0066] (3) Place the foam prefabricated body after slurry drying in a tube furnace, and perform pyrolysis-oxidation treatment in an air atmosphere. The heating rate is 0.1°C / min, and the temperature is raised from room temperature to 300°C, and the...

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Abstract

The invention relates to a method for preparing high-performance foamed ceramic by combining a template method with a chemical vapor infiltration method. A template method and a chemical vapor infiltration method are combined, no sintering aid needs to be added, a foamed ceramic skeleton is obtained by preparing high-purity ceramic powder slurry and based on the template method through slurry hanging, drying and template removal (optional), then the foamed ceramic skeleton is densified by combining the chemical vapor infiltration method, and finally the high-performance foamed ceramic is obtained. Compared with a traditional foamed ceramic preparation method, preparation of various ultrahigh-temperature foamed ceramics can be achieved without limitation of the preparation temperature. Compared with a traditional foamed ceramic preparation method, the method can also realize combined design and preparation of multiple components of the foamed ceramic based on different slurries and CVIprecursor materials, so that the prepared foamed ceramic has designability and compatibility of multiple functions of structure, bearing, electromagnetism and the like.

Description

technical field [0001] The invention belongs to the technical field of foam ceramic preparation, and relates to a method for preparing high-performance foam ceramics by combining a template method with a chemical vapor phase infiltration method. Background technique [0002] Ceramic foam not only has excellent physical and chemical properties such as high temperature resistance, corrosion resistance and thermal shock resistance of ceramic materials, but also has high porosity, high specific surface area, low density and low thermal conductivity. It is used in filtration, catalysis, heat insulation, It has a wide range of applications in many fields such as wave penetration and lightweight structures. The annual demand of my country's foundry industry for ceramic foam filters is nearly 100 million pieces, and the output value can reach 600-700 million yuan. The annual demand for foam ceramic filters in the world's foundry industry reaches 1 billion pieces, and its economic be...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B35/571C04B35/622C04B35/626C04B35/81C04B35/591
CPCC04B38/0615C04B35/571C04B35/622C04B35/626C04B35/591C04B38/0074C04B38/0067
Inventor 成来飞刘持栋张青刘永胜
Owner NORTHWESTERN POLYTECHNICAL UNIV
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