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Method for preparing material with controllable macro and micro structures

A microstructure and macroscopic technology, applied in the direction of additive processing, ceramic products, applications, etc., can solve the problems of complex follow-up processing, low molding strength, and low molding accuracy

Active Publication Date: 2019-03-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] 3D printing manufacturing technologies include light curing molding, selective laser sintering molding, and layered solid molding. Small fine parts
[0012] However, there is no report on the combination of 3D direct writing technology and freeze casting method.

Method used

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  • Method for preparing material with controllable macro and micro structures
  • Method for preparing material with controllable macro and micro structures
  • Method for preparing material with controllable macro and micro structures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] In the slurry (3D ink), the solid phase volume fraction of the zirconia particles is 10vol%; the solvent is water; the dispersant is polyethyleneimine; the addition is 0.2% of the dry powder mass of the zirconia particles, and the The zirconia particles, water, and dispersant are mixed evenly, adding zirconia grinding balls and 1-2 drops of n-octanol defoamer, after ball milling, and ultrasonically vibrating to prepare the zirconia ceramic suspension. Subsequently, gelling agent gelatin was added to the zirconia suspension, and its addition amount was 15wt.% of the solvent mass, followed by ball milling at a temperature of 60°C for 2h, and then poured into a 3D direct writing device syringe at 0°C Stand still for 8 minutes to promote the transformation of the suspension into a gel, then put the syringe loaded with hydroxyapatite gel into a 500um needle nozzle, and perform direct writing molding on the thermally conductive substrate, and control the temperature of the the...

Embodiment 2

[0096] In the slurry (3D ink), the solid phase volume fraction of zirconia particles is 35vol%; the solvent is water; the dispersant is polyacrylic acid, and the addition amount is 1.0% of the dry powder mass of zirconia particles. Mix the above raw materials to form a slurry, add zirconia grinding balls and 1-2 drops of n-octanol defoamer, and after ball milling, ultrasonically vibrate to prepare the zirconia ceramic suspension. Subsequently, gelling agent gelatin was added to the zirconia suspension in an amount of 3wt.% of the liquid phase content, followed by ball milling at a temperature of 60°C for 2h, and then poured into the syringe of a 3D direct writing device at 0°C Stand still for 1 min to promote the transformation of the suspension into a gel, then put the syringe loaded with hydroxyapatite gel into a 50um needle nozzle, and perform direct writing molding of the slurry on the thermally conductive substrate, and control the temperature of the thermally conductive s...

Embodiment 3

[0098] In the slurry (3D ink), the solid phase volume fraction of the alumina particles is 20vol%; the solvent is tert-butanol; the dispersant is PEO, and the amount of the dispersant is 0.5% of the dry powder mass of the alumina particles. %, mix the dispersant, tert-butanol, and alumina particles to form a slurry, add zirconia balls and defoamers, perform ball milling, and ultrasonically vibrate to prepare the alumina ceramic suspension. Subsequently, a gelling agent pectin was added to the alumina suspension in an amount of 7wt.% of the liquid phase content, followed by ball milling at a temperature of 60°C for 3 hours to obtain a slurry, which was poured into the slurry after gelling In the syringe of the 3D direct writing equipment, the syringe loaded with alumina gel is then loaded into a 300um needle nozzle, and the paste on the thermally conductive substrate is directly written, and the temperature of the thermally conductive substrate is controlled at 0°C. Obtain a ro...

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Abstract

The invention discloses a method for preparing a material with controllable macro and micro structures. The method is realized by combining a 3D direct writing molding technology and a freezing casting method, and specifically includes adding a raw material A into a solvent containing a dispersant and mixing for the first time to obtain a suspension, and then adding a gel into the suspension and mixing for the second time to obtain a slurry material; and passing, by the slurry material, through 3D direct writing equipment, controlling the slurry material to be in a gel state when passing through the direct writing equipment, printing and freezing the material to obtain a blank body with a three-dimensional structure, freeze drying and sintering the blank body to obtain the material with controllable macro and micro structures. The method firstly realizes the high-efficiency combination of direct writing molding and the freezing casting technology, and overcomes the limitation of the traditional preparation technology in simultaneously realizing the microscopic pore structure and the complex three-dimensional structure.

Description

technical field [0001] The invention relates to a method for preparing a material with controllable macroscopic and microscopic structures, and belongs to the field of forming three-dimensional structural materials. Background technique [0002] 3D printing manufacturing technologies include light curing molding, selective laser sintering molding, and layered solid molding. Small fine pieces. In recent years, 3D direct ink writing (DIW) technology based on rapid prototyping has attracted extensive attention of researchers because it can prepare complex and fine three-dimensional periodic structures with large aspect ratio and span features. [0003] In a broad sense, 3D direct writing refers to a technology that uses molding equipment installed on a computer-controlled platform to precisely shape materials with specific components according to the structure set by computer software. Generally, the ink material (ink) is stored in a temperature-controllable barrel, the nozzl...

Claims

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Application Information

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IPC IPC(8): C04B35/622B33Y10/00B33Y70/00B33Y80/00C04B35/10C04B35/48C04B38/00B22F3/22
CPCC04B35/10C04B35/48C04B35/622C04B38/00B22F3/22B33Y10/00B33Y70/00B33Y80/00C04B2235/3217C04B2235/447C04B2235/3873C04B2235/386C04B2235/3826C04B2235/3244
Inventor 张斗廖晶晶苏波
Owner CENT SOUTH UNIV
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