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Porous ceramic and preparation method thereof

A technology of porous ceramics and ceramic embryos, which is applied to ceramic products, other household utensils, and household utensils. It can solve the problems of large pore size, easily affected stability of porous ceramics, and low thermal conductivity, so as to improve adsorption performance and equipment. Low requirements, the effect of increasing the specific surface area

Pending Publication Date: 2022-04-19
北京市科学技术研究院分析测试研究所(北京市理化分析测试中心)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a porous ceramic to alleviate the problems that the porous ceramic prepared by the existing method is easily affected by stability, has a low thermal conductivity and has a large pore size

Method used

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  • Porous ceramic and preparation method thereof
  • Porous ceramic and preparation method thereof
  • Porous ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Put 50g of alumina particles, 10g of sucrose, and 1.5g of ammonium polyacrylate in 100mL of deionized water and stir evenly at room temperature; then add n-hexylamine solution (n-hexylamine 1.5g, ethanol 2mL) dropwise under stirring to make a dispersion , the dropping rate is 2mL / min; add 100mL n-hexane to the prepared dispersion liquid, foam with a hand-held mixer, the stirring rate is 15000rpm, and the stirring time is 3min to form a stable Pickering emulsion; the above-mentioned Pickering emulsion is dried at room temperature and placed Put it into the quartz tube of the tube furnace, fill the system with argon gas, the flow rate of argon gas is 10-20mL / min, so that there is no active gas such as oxygen in the quartz tube. The Pickering foam was heated at a rate of 10°C / min to the final carbonization temperature of 1500°C, and kept at this temperature for 3 hours. Slowly lower the temperature under argon to obtain a porous alumina ceramic, marked as C1.

[0043] For...

Embodiment 2

[0046] Put 60g of alumina particles, 18g of sucrose, and 2g of ammonium polyacrylate in 100mL of deionized water and stir evenly at room temperature; then add propyl gallate solution dropwise under stirring (2g of propyl gallate, 2mL of ethanol) to prepare Dispersion, drop rate 2mL / min; Add 150mL n-dodecane to the prepared dispersion, foam with a hand-held mixer, stirring speed 15000rpm, stirring time 3min, to form a Pickering emulsion with stable particles; the Pickering emulsion above After drying at room temperature, put it into the quartz tube of the tube furnace, fill the system with argon gas, and the flow rate of argon gas is 10-20mL / min, so that there is no active gas such as oxygen in the quartz tube. The ceramic green body was heated at a rate of 10°C / min to a final carbonization temperature of 1500°C, and kept at this temperature for 3 hours. Slowly lower the temperature under argon to obtain porous alumina ceramics, marked as C2.

[0047] The average pore diameter...

Embodiment 3

[0049] Put 40 g of alumina particles, 15 g of starch, and 1 g of ammonium polyacrylate into 100 mL of deionized water and stir evenly at room temperature; Methyl ammonium bromide 1g, water 2mL) make dispersion liquid, drop rate 1mL / min; Add 200mL n-hexane in the dispersion liquid made, and foam with hand-held mixer, stirring rate 15000rpm, stirring time 3min, form Particle-stabilized Pickering emulsion; the above-mentioned stable Pickering emulsion is put into the quartz tube of the tube furnace after drying at room temperature, and the system is filled with argon gas, the flow rate of argon gas is 10-20mL / min, so that there is no active gas such as oxygen in the quartz tube . The ceramic green body was heated at a rate of 10°C / min to a final carbonization temperature of 1600°C, and kept at this temperature for 3 hours. Slowly lower the temperature under argon to obtain porous alumina ceramics, marked as C3.

[0050] The average pore diameter of the porous alumina ceramic pr...

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Abstract

The invention belongs to the technical field of preparation of porous ceramics, particularly relates to porous ceramics and a preparation method thereof, and aims to solve the problems that the stability of the porous ceramics prepared by the existing method is easily influenced, the heat conductivity coefficient is lower and the pore diameter is larger. The porous ceramic is prepared by the following steps: drying a Pickering emulsion to form a ceramic green body, and sintering the ceramic green body, wherein the Pickering emulsion is formed by uniformly stirring 20-80 parts by mass of inorganic oxide particles, 20-80 parts by mass of carbohydrate, 20-80 parts by mass of a dispersing agent and 20-80 parts by mass of deionized water, dropwise adding 20-80 parts by mass of a short-chain surfactant in a stirring state to prepare a dispersion liquid, adding an oil phase and foaming. 1 to 40 parts of carbohydrate; 0.5-3 parts of a dispersant; 100 parts of deionized water; 0.5 to 3 parts of a short-chain surfactant; and 0.5-6 parts of an oil phase. The thermal conductivity of the prepared porous ceramic is improved, the porosity regulation and control range of the ceramic is larger, the particle size selection range is wider, and the stability of emulsion in the preparation process is good.

Description

technical field [0001] The invention belongs to the technical field of preparation of porous ceramics, and in particular relates to a porous ceramic and a preparation method thereof. Background technique [0002] Porous ceramics have the advantages of corrosion resistance, good mechanical properties, large specific surface area, and stable chemical properties. They are widely used in catalytic support carriers, filter materials, purification and separation, thermal insulation and refractory materials, and sound absorption and shock absorption. The pore-forming methods of common porous ceramics mainly include partial sintering method, replica template method, sacrificial template method, direct foaming method and microemulsion template method. Different methods can obtain specific pore structure and porosity. [0003] The direct foaming method is to introduce gas into the suspension by mechanical stirring or adding a foaming agent. Under stirring, the slurry will produce fine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/10C04B35/622
CPCC04B38/0032C04B35/10C04B35/622C04B2235/425C04B2235/656C04B2235/6562C04B2235/6567C04B2235/658C04B2235/95C04B2235/9607
Inventor 李亚莉刘卫卫邹涛赵瑾张涛邓平晔
Owner 北京市科学技术研究院分析测试研究所(北京市理化分析测试中心)
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