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A method for preparing complex three-dimensional structure ceramics with biomimetic porosity

A technology of three-dimensional structure and ceramics is applied in the field of preparation of complex three-dimensional structure ceramics to achieve the effects of improving product purity, reducing preparation cost and high yield

Active Publication Date: 2021-09-07
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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  • A method for preparing complex three-dimensional structure ceramics with biomimetic porosity
  • A method for preparing complex three-dimensional structure ceramics with biomimetic porosity
  • A method for preparing complex three-dimensional structure ceramics with biomimetic porosity

Examples

Experimental program
Comparison scheme
Effect test

example 1

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

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

[0062] Then put the slurry in the syringe, raise the temperature in the syringe to above 35°C, and let it stand for 1-2 hours for defoaming treatment. Then adjust the temperature of the syringe to 25-35°C, and adjust the rheological properties of the slurry to an appropri...

example 2

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

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

[0069] Then put the slurry in the syringe, raise the temperature in the syringe to above 14°C, and let it stand for 1-2h 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 r...

example 3

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

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

[0076] Then put the slurry in the syringe, raise the temperature in the syringe to above 28°C, and let it stand for 1-2 hours for defoaming treatment. Then adjust the temperature of the syringe to 18-28°C, and adjust the rheological properties of the slurry to a...

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Abstract

The invention belongs to the scope of forming a three-dimensional structure, and in particular relates to a preparation method of bionic porous complex three-dimensional structure ceramics. In the present invention, the direct-writing slurry is obtained by dissolving the ceramic precursor in a solvent and undergoing a partial cross-linking reaction. After the obtained direct-writing slurry is degassed, it is subjected to direct-writing molding in a directional cold field environment, and then freeze-dried, Cross-linking-cracking and other processes to obtain ceramics with bionic porous three-dimensional structure. The invention realizes the high-efficiency combination of direct-writing molding and freeze-casting technology for the first time, and overcomes the limitation of traditional preparation technology in realizing multi-scale hole structure and complex three-dimensional structure.

Description

technical field [0001] The invention belongs to the scope of forming a three-dimensional structure, and in particular relates to a preparation method of bionic porous complex three-dimensional structure ceramics. Background technique [0002] In 2006, "Science" magazine published Deville et al. [Deville S, SaizE, Nalla R K, Tomsia AP. Freezing as a path to build complex composites JScience, 2006, 311 (5760): 515-518.] of the University of Berkeley in the United States. From the perspective of the nacre lamellar structure of the shell structure, a lamellar oriented HA porous structure similar to the nacre structure was prepared by Freeze Casting, and its mechanical properties are comparable to those of biological compact bone, which shows that The great advantage of this method in preparing porous materials with oriented sheet-packed structure has set off a research upsurge of oriented porous materials. Freeze Casting, also known as the Ice-templating method, freezes and sol...

Claims

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Application Information

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Patent Type & Authority Patents(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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