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Method for 3D printing of porous ceramic texture engineering workpiece

A technology of porous ceramics and tissue engineering, applied in the direction of ceramic products, additive processing, applications, etc., can solve the problems of materials not functioning well, the performance of scaffolds is far inferior, and cracks, etc., to improve biocompatibility, Solve the effect of poor resistance to external impact and improve mechanical properties

Active Publication Date: 2019-07-19
GENERAL HOSPITAL OF PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN201611110481.7 is now retrieved, which provides a 3D printed bone repair scaffold with multi-level channels and its manufacturing method. It uses TCP powder with a particle size of 100 μm calcined at 1300 ° C as the raw material powder. Due to excessive temperature, there will be some When α-TCP is generated, the scaffold degrades too quickly, causing the material to not function well, and when the β phase is transformed into the α phase, the volume increases, which will cause the material to expand and cause cracks, so the performance of the scaffold is far inferior to that of grain. β-TCP powder with smaller diameter
In addition, the printer used in this method uses a cone-shaped nozzle to constantly eject columnar ink with a diameter of 250 μm, and it is impossible to perform precise 3D printing by adjusting the nozzle.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Weigh β-tricalcium phosphate powder with an average particle size of 3 μm and magnesium silicate powder with an average particle size of 5 μm, wherein magnesium silicate accounts for 7wt.%, then add solid glucose accounting for 1wt.% of the powder mass, and mix by ball milling Uniform;

[0038] (2) Put the mixed powder in step (1) into a corundum crucible and compact it to a relative density of 30%, pre-sinter at 800° C. for 1 hour, and then crush the pre-sintered powder by ball milling to obtain ceramic composite powder with an average particle size of 2 microns;

[0039] (3) Dissolve 1wt% organic monomer acrylamide, 0.1wt% crosslinking agent N-N'-methylenebisacrylamide, 0.5wt% dispersant ammonium citrate in deionized water, and keep stirring until the dissolution is complete to obtain The premixed solution, and then the ceramic composite powder obtained in step (2) and the premixed solution are evenly stirred according to the ceramic solid phase content of 40vol%,...

Embodiment 2

[0044] (1) Weigh β-tricalcium phosphate powder with an average particle size of 20 μm and magnesium silicate powder with an average particle size of 15 μm, wherein magnesium silicate accounts for 18wt.%, then add solid glucose accounting for 3wt.% of the powder, and mix evenly by ball milling;

[0045] (2) Put the mixed powder in step (1) into a corundum crucible and compact it to a relative density of 40%, pre-sinter at 1000° C. for 3 hours, and then ball mill the pre-sintered powder to obtain ceramic composite powder with an average particle size of 5 microns;

[0046] (3) Dissolve 5wt% organic monomer silane acrylate, 0.6wt% crosslinking agent dimethylaminopropylamine, and 3wt% dispersant polyvinylpyrrolidone in deionized water, and keep stirring until the dissolution is complete to obtain a premixed liquid, and then the step (2) The obtained ceramic composite powder and the premixed liquid are stirred evenly according to the ceramic solid phase content of 65 vol%, to obtain...

Embodiment 3

[0051] (1) Weigh β-tricalcium phosphate powder with an average particle size of 12 μm and magnesium silicate powder with an average particle size of 8 μm, wherein magnesium silicate accounts for 13wt.%, then add solid glucose accounting for 2wt.% of the powder, and mix evenly by ball milling;

[0052] (2) Put the mixed powder in step (1) into a corundum crucible and compact it to a relative density of 35%, pre-sinter at 900° C. for 2 hours, and then ball mill the pre-sintered powder to obtain ceramic composite powder with an average particle size of 4 microns;

[0053] (3) Dissolve 3wt% organic monomer urethane acrylate, 0.4wt% crosslinking agent triethylenetetramine, and 1.5wt% dispersant sodium polyacrylate in deionized water, and keep stirring until the solution is completely obtained to obtain a premixed solution. The ceramic composite powder obtained in step (2) and the premixed liquid are stirred evenly according to the ceramic solid phase content of 55 vol%, and a cerami...

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Abstract

The invention provides a method for 3D printing of a porous ceramic texture engineering workpiece, and belongs to the field of material preparation in additive manufacturing. The preparation method comprises the following steps: uniformly mixing two ceramic powders, namely beta-tricalcium phosphate and magnesium silicate, with an additive through rolling ball-milling, pre-sintering the mixed powder, and conducting crushing to obtain ceramic composite powder; mixing the ceramic composite powder with organic premix liquid to prepare ceramic slurry which is high in solid content, low in viscosityand suitable for printing; adopting 3D gel printing for printing forming, and conducting drying, degreasing and sintering on a printing blank to obtain a porous ceramic product sintered body; and then soaking the porous ceramic product sintered body in a polycaprolactone (PCL) solution to prepare a polycaprolactone (PCL) film layer on the surface of the product sintered body, so as to overcome the brittleness and low strength of a tricalcium phosphate ceramic scaffold, and improve the biocompatibility.

Description

technical field [0001] The invention relates to a method for 3D printing porous ceramic tissue engineering parts, which belongs to the field of additive manufacturing, and provides a method for preparing ceramic tissue engineering parts by 3D printing technology. The method is prepared by mixing two kinds of ceramic powders. The 3D gel printing slurry with high solid content, good stability and low viscosity is used for 3D gel printing, and then the surface of the sintered ceramic composite part is coated with a plastic polymer layer. Background technique [0002] 3D printing technology, also known as "additive manufacturing" technology, is a rapid prototyping technology developed on the basis of 2D printing, droplet jetting and modern material science. The basic principle is based on digital model files, powdered metal or Bondable materials such as ceramics are printed layer by layer to bond the layers to each other to form a three-dimensional model of the object. 3D gel-p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/447C04B35/622C04B35/632C04B35/638B33Y10/00B33Y70/00
CPCC04B38/0645C04B35/447C04B35/622C04B35/632C04B35/638B33Y10/00B33Y70/00C04B2235/3445C04B2235/6026C04B2235/6567
Inventor 汪爱媛邵慧萍林涛彭江许文静孟昊业卢世璧
Owner GENERAL HOSPITAL OF PLA
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