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Preparation method of highly oriented tube-shaped through hole porous ceramics

A technology of porous ceramics and directional tubes, which is applied in the field of ceramic materials, can solve the problems of no reports, etc., and achieve the effects of simple preparation process, dense hole wall, and high green body strength

Inactive Publication Date: 2009-12-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] According to the search, there is no report at home and abroad about the preparation of highly oriented tubular porous ceramic materials with dense pore walls by the freeze-casting method.

Method used

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  • Preparation method of highly oriented tube-shaped through hole porous ceramics
  • Preparation method of highly oriented tube-shaped through hole porous ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]At a temperature of 35°C, mix tert-butanol, PVB, and PEG according to the mass ratio of tert-butanol:PVB:PEG=100:3:3 to prepare a pre-prepared solution, and add submicron Grade alumina powder is ball milled for 6 hours at 25°C to 30°C to obtain a stable ceramic suspension. The ceramic suspension is injected into the mold at 30°C, and then the suspension and the mold are placed on a constant temperature bath. The bottom of the ceramic suspension is at a constant low temperature of -30°C. Except for the bottom of the ceramic suspension in the mold, the rest of the ceramic suspension is in an adiabatic state. , keep the bottom at a constant temperature for 4-8 hours, put the green body that has formed the directional air hole template together with the mold into a low-temperature refrigerator (below -50°C) for 24-72 hours, then take out the mold and the green body, and demould at 0°C , put it into a freeze dryer, dry it in vacuum at -50°C for 24 hours, then heat it up to 50...

Embodiment 2

[0036] At a temperature of 35°C, mix and prepare tert-butanol, PVP, deionized water, and silane coupling agent according to the mass ratio of tert-butanol:PVP:deionized water:silane coupling agent=100:15:8:1 To become a pre-prepared solution, add submicron lead zirconate titanate powder according to the solid phase volume fraction of 25 vol%, and ball mill for 4 hours under the condition of 25° C. to 30° C. to obtain a stable ceramic suspension. The ceramic suspension is injected into the mold at 30°C, and then the suspension and the mold are placed on a constant temperature tank. The bottom of the ceramic suspension is at a constant low temperature of -170°C. Except for the bottom of the ceramic suspension at a constant temperature, the rest of the ceramic suspension in the mold is insulated. , keep the bottom at a constant temperature for 4-8 hours, put the green body that has formed the directional air hole template together with the mold into a low-temperature refrigerator ...

Embodiment 3

[0038] At a temperature of 45°C, tert-butanol and PVB were mixed according to the mass ratio of tert-butanol:PVB=100:5 to form a pre-prepared solution, and submicron zirconia powder was added according to the solid phase volume fraction of 20vol%. Ball mill for 4 hours under the condition of 25°C-30°C to obtain a stable ceramic suspension. The ceramic suspension is injected into the mold at 30°C, and then the suspension and the mold are placed on a constant temperature tank. The bottom of the ceramic suspension is at a constant low temperature of 10°C. Except for the bottom of the ceramic suspension in the mold, the rest is in adiabatic state. Keep the bottom at a constant temperature for 4 to 8 hours, put the green body that has formed the directional air hole template together with the mold into a low-temperature refrigerator (below -50°C) for 24 to 72 hours, then take out the mold and the green body, and demould at 10°C. Put it into a freeze dryer, dry it in vacuum at -50°C...

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Abstract

The invention relates to a preparation method of a highly oriented tube-shaped through hole porous ceramic, belonging to the technical field of ceramics. The method is implemented by using high polymer and ceramic powder as raw material, and tertiary butanol as solvent to prepare suspensoid; adding solvent modifier into the suspensoid followed by mixing evenly, injection molding, freezing, curing and forming, transferring into a freezer dryer after de-molding, disintegrating and sintering to obtain ceramic material with through hole length reaching 3-10mm, hole structure being of long tube shape or needle shape and no dendritic forks. Different from the traditional pore-forming method, the invention requires no addition of any pore-former, the solvent forms long column shape crystal to penetrate through a green body, a pore template is formed in the green body, and ceramic powder particles are extruded in the vertical direction of the crystal growth in the crystallization process, meanwhile due to the addition of little amount of adhesive, the ceramic powder particles are adhered tightly, besides, the sublimation and deprivation process of the solvent means applying certain strain on the ceramic powder particles, therefore, the prepared green body is low in density and high in strength.

Description

technical field [0001] The invention relates to the field of ceramic materials and provides a new method for preparing porous ceramic materials with highly oriented tubular through-holes. Background technique [0002] Ceramic materials have the advantages of high temperature resistance, corrosion resistance, high hardness, and versatility in electricity, magnetism, light, heat, sound, force, etc., and are widely used in production and life. For a long time, material science researchers have been working on how to obtain denser materials, believing that the pores inside them are an important factor for material failure. Recent studies have shown that if the shape, size, and distribution of the pores inside the material are controllable, the material can be endowed with special properties and uses, for example: ceramic materials with high closed porosity can be used as building material insulation layers, Refractory materials, floating materials on water, and aerospace wave-t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00
Inventor 汪长安郭瑞杨安坤周立忠黄勇
Owner TSINGHUA UNIV
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