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Method for preparing porous silicon carbide ceramic with high porosity

A technology of porous silicon carbide and high porosity, applied in ceramic products, applications, household appliances, etc., can solve the problems of high reaction temperature and large pore diameter of porous silicon carbide materials, and achieve uniform pore size distribution, high porosity, and cost reduction Effect

Active Publication Date: 2008-06-18
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After these raw materials are made into mud, porous silicon carbide ceramics are made through processes such as molding, drying, cracking and high-temperature sintering. The pore size, porosity and other properties can be controlled by changing the ratio of raw materials and process conditions. The reaction temperature is very high (2200~2600℃)
U.S. Patent US005248462A has also introduced a kind of silicon source and carbon source with silicon powder and carbon powder respectively, and lead ball or other spherical materials are the continuous preparation process that prepares foamed silicon carbide material as pore-forming agent, and this process is by molding (silica powder , the mixture of carbon powder and binder is evenly wrapped on the lead balls, and fills the pores between the lead balls), heating (removing the low-melting lead balls to form holes) and high temperature sintering (making silicon and carbon react to form) three steps To generate foamed silicon carbide material, but the porous silicon carbide material obtained by this method has a larger pore size

Method used

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preparation example Construction

[0012] The invention provides a preparation method of porous silicon carbide ceramics with high porosity. After the four steps of treatment and high-temperature sintering, a high-porosity porous silicon carbide ceramic material is obtained, which is characterized in that: the specific process steps are:

[0013] 1) According to the mass ratio of silicon powder, phenolic resin and alcohol: 1:(0.25~1.1):2, mix into slurry;

[0014] 2) Preparation of package-mixed powder: heat-treating the mixed slurry at 30-80°C and stirring for 30-120min; then cooling to below 10°C, and then cooling at 0-10°C while stirring for 10-60min; The mixed slurry is injected into water with an injection pressure of 0.2 to 1.2 MPa; aging treatment is carried out at 30 to 90° C., and the stirring time is 30 to 120 minutes; Powder mixed with silicon powder;

[0015] 3) Forming the green ceramic body with the powder of phenolic resin mixed with silicon powder at low temperature and low pressure: the formi...

Embodiment 1

[0021] Firstly, the silicon powder, barium phenolic resin and alcohol (mass ratio 1:0.25:2) were mixed by bag mixing process, heat treated at 30℃ for 120min, cold treated at 0℃ for 10min, injection pressure 0.2MPa, aged at 30℃ for 120min, Vacuum-drying at 40°C for 120min to obtain the package-mixed powder; then hold the package-mixed powder at 60°C under a pressure of 0.05MPa for 120min to obtain a ceramic green body; High temperature carbonization treatment, the temperature is 600 °C, the heating rate is 0.3 °C / min, and the temperature is kept for 240 min; finally, the powder obtained by carbonization treatment is sintered at high temperature under the protection of argon (50ml / min), the temperature is 1300 °C, and the heating rate is 1 °C / min, holding for 8 hours to form a porous silicon carbide ceramic material with high porosity.

Embodiment 2

[0023] Firstly, the silicon powder, barium phenolic resin and alcohol (mass ratio 1:0.25:2) were mixed by bag mixing process, heat treated at 30℃ for 120min, cold treated at 0℃ for 10min, injection pressure 0.2MPa, aged at 30℃ for 120min, Vacuum-drying at 40°C for 120min to obtain the package-mixed powder; then hold the package-mixed powder at 80°C under a pressure of 0.1MPa for 60min to obtain a ceramic green body; High temperature carbonization treatment, the temperature is 800 °C, the heating rate is 0.5 °C / min, and the temperature is kept for 120 minutes; finally, the powder obtained by carbonization treatment is sintered at a high temperature under the protection of argon (100ml / min), the temperature is 1500 °C, and the heating rate is 2.5 °C / min, holding for 4 hours to form a porous silicon carbide ceramic material with high porosity.

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Abstract

The invention discloses a method for preparing porous silicon carbide ceramic with high porosity which comprises preparing mix-coated powder from silicon powder, phenol resin and ethanol by a predetermined proportion, then carrying out low-temperature low-pressure modeling to produce ceramic blanks, high temperature carbonizing the ceramic blanks, finally sintering at high temperature to obtain the end product whose factor of porosity is greater than 80%.

Description

technical field [0001] The invention belongs to the technical field of ceramic material preparation, and particularly relates to a preparation method of high-porosity silicon carbide ceramics. technical background [0002] Due to its good permeability, large specific surface area, low density, high strength, low thermal conductivity, high temperature resistance, wear resistance, good chemical stability, good radiation resistance and electromagnetic loss and other excellent properties, porous silicon carbide materials have been Widely used in aerospace, energy, machinery, metallurgy, chemical industry, environmental protection, military industry, electronics and biology and other disciplines, involving fluid separation and filtration, diffusion, heat insulation, sound absorption, sensing, electrochemical process and catalytic reaction engineering Therefore, the research of porous silicon carbide materials has attracted great attention from the global material science communit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/622C04B38/06C04B35/584
Inventor 时利民赵宏生唐春和闫迎辉梁彤祥
Owner TSINGHUA UNIV
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