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Thixotropic ceramic paste material for stereolithography molding and preparation method thereof

A technology of stereolithography and thixotropy, applied in the field of ceramic additive manufacturing, can solve the problems of difficult printing process, damage to the surface quality of parts, complicated support, etc., to simplify the time for removing support, ensure surface quality, and improve surface quality Effect

Active Publication Date: 2022-06-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic research on ceramic stereolithography materials mostly focuses on slurry, such as CN106747360A, CN106810215A, CN107129283A, CN105566860A, etc., but the slurry has the disadvantages of being unable to store for a long time, low solid content, and complicated support.
Although CN 107500736 A has reported a kind of paste material and its preparation method, this paste material has the same composition as the slurry, which causes its viscosity to be high, and it is difficult to form a flat material layer under the action of a scraper, which has caused great harm to the printing process. Great difficulty, and it does not improve the problem of support complexes, which impairs the surface quality of the part

Method used

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  • Thixotropic ceramic paste material for stereolithography molding and preparation method thereof
  • Thixotropic ceramic paste material for stereolithography molding and preparation method thereof
  • Thixotropic ceramic paste material for stereolithography molding and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Prepare a high-energy planetary ball mill, add an appropriate amount of zirconia grinding balls, 16g of photocurable monomer tricyclodecyl dimethanol diacrylate, and 0.24g of photoinitiator 2-hydroxy-2-methyl- Phenylacetone-1 and 2.1706 g of phosphate dispersant were mixed and dissolved by stirring. Weigh 120 g of β-tricalcium phosphate in a ball milling jar in three times, weighing 40 g each time, and perform ball milling at 200 r / min, 250 r / min, and 250 / min for 1 h in turn. After the ball milling, add 8.5g of polyethylene glycol 300 thixotropic agent to the ball mill, and mill it for 2 hours at a speed of 300r / min or 350r / min to obtain the desired paste, such as figure 1 , the rheological property test shows that the shear rate of the paste is 0.01s -1 The viscosity is greater than 16000pa s, and the viscosity decreases rapidly with the increase of shear rate, and the shear rate is 100s -1 The viscosity is less than 20pa·s, the yield stress is greater than 400pa, an...

Embodiment 2

[0031] Prepare a high-energy planetary ball mill, add an appropriate amount of zirconia grinding balls, 20g of photocurable monomer 1,6-ethylene glycol diacrylate, and 0.16g of photoinitiator 2-hydroxy-2-methyl into the ball mill jar. -Phenylacetone-1 and 1.2 g of a phosphate dispersant were mixed and dissolved by stirring. Weigh 48g of β-tricalcium phosphate and 12g of bio-glass powder in three times in the ball mill jar, weigh 16g of β-tricalcium phosphate and 4g of bio-glass powder each time, and put them at 200r / min, 250r / min, 250 / min in turn. Each ball was milled for 0.5h under the rotating speed. After the ball milling, 4 g of hydrophobic fumed silica thixotropic agent was added to the ball milling tank, and the paste was obtained by ball milling at 300 r / min or 350 r / min for 2 hours. like figure 2 , the rheological property test shows that the shear rate of the paste is 0.01s -1 When the viscosity is greater than 700pa s, the viscosity decreases rapidly with the inc...

Embodiment 3

[0033] Prepare a high-energy planetary ball mill, add an appropriate amount of zirconia grinding balls, 20g of photocurable monomer ethoxylated trimethylol triacrylate, and 0.16g of photoinitiator 2-hydroxy-2-methyl into the ball mill jar. base-phenylacetone-1, 1.05 g of polyacrylate, and stirred to mix and dissolve. Weigh 70 g of alumina into the ball milling jar in three times, weigh 23.3 g of alumina each time, and perform ball milling at 200 r / min, 250 r / min, and 250 / min for 1 h in turn. After the ball milling, add 2g of polyamide wax powder thixotropic agent to the ball mill tank, and mill it for 2 hours at 300r / min or 350r / min to obtain a paste that meets the requirements, such as: image 3 , the rheological property test shows that the shear rate of the paste is 0.01s -1 When the viscosity is greater than 30000pa s, the viscosity decreases rapidly with the increase of shear rate, and the shear rate is 100s -1 When the viscosity is less than 30pa s, the yield stress is...

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Abstract

The invention relates to a thixotropic ceramic paste material for stereolithography molding and a preparation method thereof, which mainly includes 70-85wt% ceramic powder; 3-15wt% thixotropic agent; 10-10wt% 25wt% light curable resin. The preparation method mainly includes the following steps: ball mill and stir ceramic powder, photocurable resin, dispersant and photoinitiator, add thixotropic agent and continue ball mill and stir to obtain paste. The ceramic paste has the characteristics of high solid content, significant thixotropy and yield pseudoplasticity, which greatly facilitates the molding process and improves the quality of parts. Can be used in medical, aerospace, defense and industrial fields.

Description

technical field [0001] The invention belongs to the technical field of ceramic additive manufacturing, and particularly relates to a thixotropic ceramic paste material for stereolithography and a preparation method thereof. Background technique [0002] Stereolithography is a rapid manufacturing technology invented by Hideo Kodama in 1981. The term "Stereolithography" is derived from the terms "stereo" and "lithography" which describe the three-dimensional process, meaning the printing of raised or recessed structures onto a flat surface. Based on CAD model slice data, parts are built layer by layer by selectively curing photosensitive resin solutions or suspensions containing photosensitive resins by light of different wavelengths (visible light, infrared light, ultraviolet light, etc.). Many different additive manufacturing equipment has been developed based on stereolithography technology, and their differences are mainly in the light source system and the recoating syst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/447C04B35/10C04B35/04C04B35/48C04B35/63C04B35/632C04B35/634C04B35/636B28B1/00B33Y70/10
CPCC04B35/447C04B35/10C04B35/04C04B35/48C04B35/6303C04B35/63488C04B35/63468C04B35/63448C04B35/632C04B35/63408C04B35/636C04B35/63424B28B1/001B33Y70/00C04B2235/3418C04B2235/36
Inventor 戴红莲黄孝龙马遇乐
Owner WUHAN UNIV OF TECH
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