Thixotropic ceramic paste material for stereolithography and preparation method thereof

A technology of stereolithography and thixotropy, which is applied in the field of ceramic additive manufacturing, can solve the problems of difficult printing process, damage to the surface quality of parts, and complex support, so as to simplify the time of removing support, ensure surface quality, and good surface quality Effect

Active Publication Date: 2019-10-15
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 and preparation method thereof
  • Thixotropic ceramic paste material for stereolithography and preparation method thereof
  • Thixotropic ceramic paste material for stereolithography and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Prepare a high-energy planetary ball mill, and add an appropriate amount of zirconia balls, 16g of photocurable monomer tricyclodecanyl dimethanol diacrylate, and 0.24g of photoinitiator 2-hydroxy-2-methyl- Phenylacetone-1, 2.1706g phosphate ester dispersant, stir to make it mix and dissolve. Weigh 120g of β-tricalcium phosphate into the ball mill jar three times, each weighing 40g, and ball mill at 200r / min, 250r / min, and 250r / min for 1 hour respectively. After the ball milling, add 8.5g polyethylene glycol 300 thixotropic agent to the ball milling jar, and ball mill it for 2 hours at a speed of 300r / min or 350r / min to obtain a satisfactory paste, such as figure 1 , the rheological performance 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 the shear rate, and the shear rate is 100s -1 The viscosity is less than 20pa·s, the yield stress is greater than 400pa, and...

Embodiment 2

[0031] Prepare a high-energy planetary ball mill, and add an appropriate amount of zirconia balls, 20g of photocurable monomer 1,6-ethylene glycol diacrylate, and 0.16g of photoinitiator 2-hydroxy-2-methyl -Phenylacetone-1, 1.2g of phosphate ester dispersant, stirred to mix and dissolve. Weigh 48g of β-tricalcium phosphate and 12g of biological glass powder in three times in the ball mill jar, weigh 16g of β-tricalcium phosphate and 4g of biological glass powder each time, and turn them at 200r / min, 250r / min, 250r / min Each ball milled for 0.5h at the rotating speed. After the ball milling, add 4g of hydrophobic fumed silica thixotropic agent into the ball milling tank, and ball mill for 2 hours at a speed of 300r / min or 350r / min to obtain a paste that meets the requirements. Such as figure 2 , the rheological performance 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 increase of t...

Embodiment 3

[0033] Prepare a high-energy planetary ball mill, and add an appropriate amount of zirconia balls, 20g of photocurable monomer ethoxylated trimethylol triacrylate, and 0.16g of photoinitiator 2-hydroxy-2-methyl Base-phenylacetone-1, 1.05g polyacrylate, stir to mix and dissolve. Weigh 70g of alumina in three times into a ball mill jar, each time weigh 23.3g of alumina, and ball mill at 200r / min, 250r / min, and 250r / min for 1 hour respectively. After the ball milling, add 2g of polyamide wax powder thixotropic agent into the ball milling tank, and ball mill for 2 hours at a speed of 300r / min or 350r / min to obtain a paste that meets the requirements, such as image 3 , the rheological performance 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 the shear rate, and the shear rate is 100s -1 When the viscosity is less than 30pa·s, the yield stress is greater than 320pa, and th...

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PUM

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Abstract

The invention relates to a thixotropic ceramic paste material for stereolithography and a preparation method thereof. The thixotropic ceramic paste material mainly comprises the following components by mass percentage: 70-85wt% of ceramic powder; 3-15wt% of a thixotropic agent; and 10-25wt% of light cured resin. The preparation method mainly includes the steps of: conducting ball-milling and stirring on the ceramic powder, light cured resin, a dispersant and a photoinitiator, then adding the thixotropic agent for further ball-milling and stirring so as to obtain the paste. The ceramic paste has the characteristics of high solid content, significant thixotropy, yield pseudoplasticity and the like, greatly facilitates the forming process and improves the quality of components, and can be used in medical, aerospace, national defense and industrial fields.

Description

technical field [0001] The invention belongs to the technical field of ceramic additive manufacturing, and in particular relates to a thixotropic ceramic paste material for stereolithography molding 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 of printing raised or recessed structures onto a flat surface. Based on the CAD model slice data, the photosensitive resin solution or the suspension containing the photosensitive resin is selectively cured by different wavelengths of light (visible light, infrared light, ultraviolet light, etc.) to build parts layer by layer. Many different additive manufacturing equipment have been developed based on stereolithography technology, and their differences are mainly in the light source system and recoating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/447C04B35/10C04B35/04C04B35/48C04B35/63C04B35/632C04B35/634C04B35/636B28B1/00B33Y70/00
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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