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Method for preparing straight-through hole aluminum oxide ceramic with compact hole wall by wet spinning-impregnation method

A technology of porous alumina and impregnation method, which is applied in the field of through-hole alumina ceramics, which can solve the problems of non-dense hole walls and large hole diameters

Active Publication Date: 2020-10-30
日照鼎源新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing through-hole ceramics have a large pore size and the hole wall is not dense, and provide a wet spinning-impregnation method to prepare straight-through-hole alumina ceramics with dense hole walls

Method used

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  • Method for preparing straight-through hole aluminum oxide ceramic with compact hole wall by wet spinning-impregnation method
  • Method for preparing straight-through hole aluminum oxide ceramic with compact hole wall by wet spinning-impregnation method

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 1. Prepare fiber monolithic precursor cell body by wet spinning method: first stir and dissolve 10 grams of polyvinyl butyral and 10 grams of polyethylene glycol in 100 grams of absolute ethanol, then add carbon black ceramic powder, carbon The black ceramic powder is composed of 100 grams of carbon black powder, which is vigorously stirred for 12 hours to make a spinneret, and then the spinneret is moved to a stainless steel storage tank, vacuum degassed for 1 hour, and the spinneret is passed through under 0.2MPa nitrogen pressure. Spray the spinneret into the gel tank filled with water, the water temperature of the gel tank is 0°C, soak for 8 hours after solidification and molding, and the cell body of the fiber monolith precursor is obtained, and the diameter of the cell body of the fiber monolith precursor is 200 μm;

[0026] 2. Coating the interface layer by dipping method: first add 2 grams of carboxymethyl cellulose to 500 grams of deionized water and stir evenly...

Embodiment 2

[0032] 1. Prepare fiber monolithic precursor cell body by wet spinning method: first stir and dissolve 20 grams of polyvinyl butyral and 20 grams of polyethylene glycol in 200 grams of absolute ethanol, then add carbon black ceramic powder, carbon The black ceramic powder is composed of 100 grams of carbon black powder, which is vigorously stirred for 48 hours to make a spinneret, and then the spinneret is moved to a stainless steel storage tank, vacuum degassed for 5 hours, and the spinneret is passed through under 0.5MPa nitrogen pressure. Spray the spinneret into the gel tank filled with water, the water temperature of the gel tank is 10°C, soak for 24 hours after solidification and molding, and the cell body of the fiber monolith precursor is obtained, and the diameter of the cell body of the fiber monolith precursor is 2000 μm;

[0033] 2. Coating the interface layer by dipping method: first add 5 grams of carboxymethyl cellulose to 1000 grams of deionized water and stir e...

Embodiment 3

[0039] 1. Prepare fiber monolithic precursor cell body by wet spinning method: first stir and dissolve 15 grams of polyvinyl butyral and 15 grams of polyethylene glycol in 150 grams of absolute ethanol, then add carbon black ceramic powder, carbon The black ceramic powder is composed of 100 grams of charcoal powder, vigorously stirred for 24 hours to make a spinneret, and then the spinneret was moved to a stainless steel storage tank, vacuum degassed for 2 hours, and the spinneret was passed through the sprayer under 0.4MPa nitrogen pressure. Spray the silk head into the gel tank filled with water, the water temperature of the gel tank is 5°C, soak for 12 hours after solidification and molding, and the cell body of the fiber monolith precursor is obtained, and the diameter of the cell body of the fiber monolith precursor is 1000 μm;

[0040] 2. Coating interface layer by dipping method: first add 4 grams of carboxymethyl cellulose to 800 grams of deionized water and stir evenly...

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Abstract

The invention provides a method for preparing straight-through hole aluminum oxide ceramic with a compact hole wall by a wet spinning-impregnation method. The method is characterized by comprising thefollowing steps of: (1) preparing fiber monolith precursor cells by adopting a wet spinning method, namely, firstly stirring and dissolving a curing agent and a plasticizer in an organic solvent, then adding carbon black ceramic powder to prepare a spinning solution, spraying the spinning solution into a gel tank through a spinneret, and carrying out solidification forming to obtain the fiber monolith precursor cells; (2) coating an interface layer by an impregnation method, namely immersing the fiber monolith precursor cells into aluminum oxide slurry, and controlling the thickness of the interface layer through the number of times of impregnation and pulling, so as to obtain a fiber monolith precursor with the interface layer; (3) carrying out warm-pressing molding, (4) carrying out vacuum degreasing, (5) carrying out hot-pressing sintering, and (6) carrying out high-temperature oxidation to obtain the straight-through hole aluminum oxide ceramic with a compact hole wall. Accordingto the straight-through hole aluminum oxide ceramic prepared by the method, the hole wall is completely compact and has higher strength, the thickness of the hole wall can reach 50 microns, and the hole diameter can reach the micron order.

Description

technical field [0001] The invention provides a wet spinning-dipping method for preparing through-hole alumina ceramics with dense pore walls, which belongs to the technical field of porous ceramic preparation. Background technique [0002] Porous ceramics have the characteristics of small bulk density, high porosity, large specific surface area, selective permeability to liquid and gas media, energy absorption or damping characteristics, etc., especially straight-through porous ceramics, which have parallel honeycomb channels inside The structure is conducive to the entry of reactants and the discharge of products. Its geometric surface is large and the flow of fluid in it is evenly distributed. Therefore, it is widely used in many aspects such as gas and liquid filtration, purification and separation. The traditional method of preparing porous ceramics with straight through holes is mud extrusion molding, that is, dry spinning molding. The green body is aged and vacuum mud...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/638C04B35/645C04B38/06C04B35/80C04B35/634
CPCC04B35/10C04B35/638C04B35/645C04B38/068C04B35/6342C04B35/63488C04B2235/3225C04B2235/3206C04B2235/6562C04B2235/6567C04B2235/96C04B38/0054
Inventor 魏春城王鹏潘光慎
Owner 日照鼎源新材料有限公司