Preparation method of bionic porous ceramic with complex three-dimensional structure

A three-dimensional structure, complex technology, applied in the field of preparation of complex three-dimensional structure ceramics

Active Publication Date: 2019-03-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, so far, there have been no related technical reports that combine the directional temperature field in frozen pouring and 3D printing.

Method used

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  • Preparation method of bionic porous ceramic with complex three-dimensional structure
  • Preparation method of bionic porous ceramic with complex three-dimensional structure
  • Preparation method of bionic porous ceramic with complex three-dimensional structure

Examples

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example 1

[0060] Polycarbosilane is used as the ceramic precursor, and camphene is used as the organic solvent to prepare multi-scale porous and complex three-dimensional silicon carbide ceramics by the method of the present invention.

[0061] Heat the camphene to above 35°C to fully melt it. Subsequently, 10wt.%-20wt.% of polycarbosilane powder is added, and the powder is fully dissolved in the camphene under the action of magnetic stirring. Then, 20wt.% (mass ratio of crosslinking agent to ceramic precursor, the same below) of divinylbenzene was added dropwise as a crosslinking agent. Under the environment of 120°C, magnetic stirring for 3h promoted partial crosslinking of polycarbosilane.

[0062] The slurry is then placed in a syringe, the temperature of the syringe is increased to 35°C or more, and it is allowed to stand for 1-2 hours for defoaming. Then adjust the temperature of the syringe to 25-35°C to adjust the rheological properties of the slurry to an appropriate range. At th...

example 2

[0067] Polycarbosilane is used as a ceramic precursor, and cyclooctane is used as an organic solvent to prepare multi-scale porous and complex three-dimensional silicon carbide ceramics by the method of the present invention.

[0068] Heat the cyclooctane to above 14°C to fully melt it. Subsequently, 10wt.%-20wt.% of polycarbosilane powder is added, and the powder is fully dissolved in cyclooctane under the action of magnetic stirring. Then, 20wt.% (mass ratio of crosslinking agent to ceramic precursor, the same below) of divinylbenzene was added dropwise as a crosslinking agent. Under the environment of 120°C, magnetic stirring for 3h promoted partial crosslinking of polycarbosilane.

[0069] The slurry is then placed in a syringe, the temperature of the syringe is raised to above 14°C, and it is allowed to stand for 1-2 hours for defoaming treatment. Then adjust the temperature of the syringe to 4-14°C, and adjust the rheological properties of the slurry to an appropriate range...

example 3

[0074] Polyoxysilane is used as a ceramic precursor, and tert-butanol is used as an organic solvent to prepare a multi-scale porous complex three-dimensional structure carbon-silicon-oxygen ternary ceramic by adopting the method of the present invention.

[0075] Heat tert-butanol to above 28°C to fully melt it. Subsequently, 10-20 wt.% of polyoxysilane powder is added, and the powder is fully dissolved in tert-butanol under the action of magnetic stirring. Then, 10-20wt.% (mass ratio of crosslinking agent to ceramic precursor, the same below) of dibutyltin dilaurate is added dropwise as a crosslinking agent. Under the environment of 50-60℃, magnetic stirring for 3h promotes partial crosslinking of polyoxysilane.

[0076] The slurry is then placed in a syringe, the temperature of the syringe is raised to above 28°C, and it is allowed to stand for 1-2 hours for defoaming treatment. Then adjust the temperature of the syringe to 18-28°C to adjust the rheological properties of the sl...

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Abstract

The invention belongs to the field of molding of three-dimensional structures and specifically relates to a preparation method of a bionic porous ceramic with a complex three-dimensional structure. The preparation method comprises the steps: dissolving a ceramic precursor into a solvent, and carrying out a partial crosslinking reaction to obtain direct writing slurry; degasifying the direct writing slurry, and then, carrying out direct writing molding in an environment of an oriented cold field; and then, carrying out processes such as freeze-drying and crosslinking-cracking to obtain the bionic porous ceramic with the three-dimensional structure. By using the preparation method, the efficient combination of a direct writing molding technology and a freeze-pouring technology is firstly realized; and the limit of a traditional preparation technology on the aspect of achieving a multi-scale hole structure and the complex three-dimensional structure is overcome.

Description

Technical field [0001] The invention belongs to the range of three-dimensional structure forming, and specifically relates to a method for preparing ceramics with bionic porous complex three-dimensional structure. Background technique [0002] In 2006, "Science" magazine published the American Berkeley University Deville et al. [Deville S, SaizE, Nalla RK, Tomsia AP. Freezing as a path to build complex composites JScience, 2006, 311(5760): 515-518.] From the perspective of the lamellar structure of the nacre of the shell structure, freeze casting is used to prepare a lamellar oriented HA porous structure similar to the nacre structure, and its mechanical properties are comparable to those of the dense bone of living organisms. The great advantages of the method in the preparation of oriented sheet-layered porous materials have set off an upsurge in the research of oriented porous materials. The Freeze Casting method is also known as the Ice-templating method, which freezes and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/571C04B35/56C04B35/622C04B35/632C04B38/00B29C64/112B29C64/20B33Y30/00B33Y70/00B33Y10/00
CPCB33Y10/00B33Y30/00B33Y70/00B29C64/112B29C64/20C04B35/5603C04B35/571C04B35/622C04B35/632C04B38/0605C04B2235/6562C04B2235/6567C04B2235/6581
Inventor 张斗陈何昊廖晶晶周科朝熊慧文黄玉娟赵连仲
Owner CENT SOUTH UNIV
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