Direct-writing forming method of precursor conversion ceramic

A technology of precursor conversion and direct writing molding, applied in ceramic molding machines, ceramic products, applications, etc., can solve the problems of increasing the controllability of finished product performance, high precision, low repetition rate, high cost, etc., and achieve excellent rheology and curing ability, simplified process route, wide range of effects

Active Publication Date: 2018-02-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the technology disclosed in the above article, the composition of the slurry is complex, and the most critical thing is that in the above scheme, the printing needs to rely on the sedimentation tank, which greatly increases the difficulty of controlling the performance of the f

Method used

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  • Direct-writing forming method of precursor conversion ceramic
  • Direct-writing forming method of precursor conversion ceramic
  • Direct-writing forming method of precursor conversion ceramic

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0054] Example 1, using polycarbosilane / n-hexane as a slurry to prepare micron-scale three-dimensional structure ceramics

[0055] Mix 5g of polycarbosilane and 20ml of n-hexane, and stir it by magnetic force at room temperature for 2h until the polycarbosilane is fully dissolved in n-hexane. Then, stir at 50° C. to volatilize the organic solvent to obtain a slurry with a solid content of 80 wt%. The slurry was injected into a 50ml syringe, and centrifuged at 1000r / min for 10 minutes to remove the slurry air bubbles.

[0056] Then install a 200um aperture needle on the top of the barrel. Perform direct writing molding on the paste, and obtain a criss-cross three-dimensional structure on the glass slide. Molding pressure 20PSI; moving speed 5mm / s.

[0057] After the organic solvent on the green body is completely volatilized, the printed precursor is placed in a blast drying oven for oxidative cross-linking treatment. The temperature setting range is 200°C, and the crosslin...

Example Embodiment

[0064] Example 2

[0065] Using polycarbosilane / n-hexane as slurry to prepare micron-scale three-dimensional structure ceramics;

[0066] Mix 5g of polycarbosilane and 20ml of n-hexane, and stir it by magnetic force at room temperature for 2h until the polycarbosilane is fully dissolved in n-hexane. Then, stir at 50° C. to volatilize the organic solvent to obtain a slurry with a solid content of 70 wt%. The slurry was injected into a 50ml syringe, and centrifuged at 1000r / min for 10 minutes to remove the slurry air bubbles.

[0067] Then install a 100um aperture needle on the top of the barrel. Perform direct writing molding on the paste, and obtain a criss-cross three-dimensional structure on the glass slide. Molding pressure 40PSI; moving speed 1mm / s.

[0068]After the organic solvent on the green body is completely volatilized, the printed precursor is placed in a blast drying oven for oxidative cross-linking treatment. The temperature setting range is 200°C, and the c...

Example Embodiment

[0073] Example 3

[0074] Using polycarbosilane / divinylbenzene to prepare micron-scale three-dimensional structure ceramics for the future;

[0075] Mix 5g of polycarbosilane and 8g of divinylbenzene. After the polycarbosilane is completely dissolved in divinylbenzene, put it into a test tube, seal it, put it in an oven, stir at 150°C for 4 hours, and then put it in a test tube at 50°C. Stir to volatilize the crosslinking agent to obtain a slurry with a solid content of 80 wt%. The slurry was injected into a 50ml syringe, and centrifuged at 2000r / min for 10 minutes to remove the slurry bubbles.

[0076] Then install a 400um aperture needle on the top of the barrel. Perform direct writing molding on the paste, and obtain a criss-cross three-dimensional structure on the glass slide. Molding pressure 50PSI; moving speed 5mm / s.

[0077] After the organic solvent on the green body was completely volatilized, the printed precursor was placed in a tube furnace, and in a nitrogen ...

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Abstract

The invention belongs to forming range of three-dimensional structure, and particularly relates to a direct-writing forming method of printing and converting a precursor into ceramic. The method includes: using a ceramic precursor as a solute, dissolving the ceramic precursor in liquid-state organic matter, stirring raw materials to obtain ink with certain viscoelasticity, and putting the ink intoa needle cylinder; through an air pressure controller and according to a set program, printing out a three-dimensional structure on a substrate layer by layer, and carrying out precursor conversion to obtain ceramic with a complex three-dimensional structure. The direct-writing forming method overcomes the defect that existing direct-writing forming ceramic suspensions are prone to nozzle blockage, low in continuity and unstable in slurry in the process of forming. The designed slurry is simple and reasonable in composition, high in rheological controllability and convenient for large-scale industrial application. A three-dimensional periodic structure prepared by the method is wide in scale range, and decimeter-scale, centimeter-scale, millimeter-scale, micrometer-scale or nanometer-scale control can be realized simply through adjusting aperture of a needle head.

Description

technical field [0001] The invention belongs to the molding range of a three-dimensional structure, and in particular relates to a method for direct-writing molding of a precursor-transformed ceramic. Background technique [0002] The concept of Direct Ink Writing was first proposed by Joseph Cesarano III of Sandia National Laboratory in the United States [Lewis, J.A., J.E.Smay, et al.. Direct Ink Writing of Three-Dimensional Ceramic Structures. Journal of the American Ceramic Society, 2006,89(12):3599-3609.] proposed. This technology first designs the required three-dimensional structure pattern with the help of computer-aided (CAD), and then automatically controls the suspension delivery device consisting of a needle cylinder and a needle nozzle installed on the Z axis through the computer to transfer the suspension in the needle cylinder from Extrude the linear fluid of precise size from the nozzle, and at the same time, the X-Y axis moves according to the trajectory set...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/584C04B35/14C04B35/632C04B35/622C04B38/00B28B1/00B33Y10/00B33Y80/00B33Y70/00
CPCB28B1/001B33Y10/00B33Y70/00B33Y80/00C04B35/14C04B35/571C04B35/589C04B35/622C04B35/632C04B38/00C04B2235/6562C04B2235/6567C04B2235/658C04B2235/96
Inventor 张斗王小锋陈何昊周科朝薛凤丹李闻淼
Owner CENT SOUTH UNIV
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