Method for preparing aluminum oxide ceramic based on sinking type DLP photocuring 3D printing

A technology of alumina ceramics and 3D printing, which is applied in the direction of improving process efficiency, additive processing, and improving energy efficiency. And the effect of good physical properties, reducing serious scattering problems, and improving printing accuracy

Active Publication Date: 2022-01-21
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there are many photocurable printing paste systems, but all of them have the problem of low solid content due to the limitation of viscosity and printing accuracy. The solid content is concentrated between 40vol% and 55vol% in volume fraction, which will easily lead to failure of subsequent sintering deformation or affect the accuracy. And the low sintering density affects the performance of ceramics. In addition, it also has problems such as easy sedimentation and low stability of the slurry. Furthermore, because a large amount of ceramic powder acts as the ultraviolet light scattering center of the slurry, the accuracy of printing and molding is greatly limited.
[0008] At present, the degreasing process of alumina ceramic green bodies formed by light-curing 3D printing technology still has problems such as bubbling, cracks and deformation, as well as residual carbon and impurities that lead to subsequent sintering failure or limited performance of sintered bodies, espec

Method used

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  • Method for preparing aluminum oxide ceramic based on sinking type DLP photocuring 3D printing
  • Method for preparing aluminum oxide ceramic based on sinking type DLP photocuring 3D printing
  • Method for preparing aluminum oxide ceramic based on sinking type DLP photocuring 3D printing

Examples

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Example Embodiment

[0041] Example 1:

[0042] Method for preparing alumina ceramics based on subsets DLP photocuring 3D, for example, figure 1 As shown, including the following steps:

[0043] S1, high-solid content, high stability, and high-yield precision photocurable alumina ceramic type paste preparation:

[0044] (1) 3 α spherical alumina powder having a diameter of 10 μm, 3 μm and 300 nm were added to the ethanol solution according to 40% by weight, 50% by weight, and 10 wt%, respectively, and the alpha spherical oxide powder was total 800g; α spherical alumina powder mass meter, 2 wt% dispersant KOS-110, after mixing for 2 h through ultrasonic stirring, drying 24 h at 80 ° C in vacuum drying tank to remove alcohol, dry alumina after drying The powder was pulverized and over 80 mesh sieves to obtain an alpha spherical alumina powder after surface modification treatment.

[0045] (2) The acrylic photosensitive resin is added to the ink tank, and 0.07% by weight of graphene, 2 wt% of the dispers...

Example Embodiment

[0054] Example 2:

[0055] A method of preparing an alumina ceramic based on an alumina ceramic based on a subsets DLP photocurable 3D, including the following steps:

[0056] S1, high-solid content, high stability, and high-yield precision photocurable alumina ceramic type paste preparation:

[0057] (1) 3 α spherical alumina powder having a diameter of 12 μm, 3 μm and 500 nm were added to the ethanol solution according to 55 wt%, 25 wt%, and 20 wt%, respectively, and the alpha spherical oxide powder was total 800g; α spherical aluminum oxide powder mass meter, dried into 3 wt% dispersant BYK-111, after mixing for 3 h by ultrasound, drying 30 h at 70 ° C in vacuum drying tank to remove alcohol, dry alumina after drying The powder was pulverized and passed through 60 mesh sieve to give alpha spherical alumina powder after surface modification treatment.

[0058] (2) The acrylic photosensitive resin is added to the ink tank, and 0.15% by weight of graphene, 2.5% by weight of disper...

Example Embodiment

[0067] Example 3:

[0068] A method of preparing an alumina ceramic based on an alumina ceramic based on a subsets DLP photocurable 3D, including the following steps:

[0069] S1, high-solid content, high stability, and high-yield precision photocurable alumina ceramic type paste preparation:

[0070] (1) Three α spherical alumina powder having an 8 μm, 4 μm and 200 nm were added to the ethanol solution according to 65%, 27 wt% and 8 wt% ratio, respectively, and the alpha spherical oxide powder was total according to 800g; The α spherical alumina powder mass meter, dripped into 1.3% by weight of dispersant TEG-0685 and 0.8% by weight of dispersant oleic acid, after mixing for 3.5 h through ultrasound, drying the mixture in a vacuum drying tank 95 ° C under vacuum drying tank 20H to remove alcohol, the aluminum oxide powder after drying is pulverized and over 100 mesh sieves to obtain an alpha spherical alumina powder after surface modification treatment.

[0071] (2) The acrylic p...

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Abstract

The invention discloses a method for preparing aluminum oxide ceramic based on sinking type DLP photocuring 3D printing, and the method comprises the following steps of: mixing and stirring aluminum oxide powder, a first dispersing agent and an organic solvent, conducting drying, crushing and sieving to obtain modified aluminum oxide powder, adding graphene, a second dispersing agent and a defoaming agent into acrylic photosensitive resin, performing mixing, then adding modified aluminum oxide powder, carrying out ball milling and defoaming treatment to obtain aluminum oxide ceramic paste, carrying out photocuring 3D printing by adopting a sunken DLP photocuring method, and then carrying out sectional process degreasing treatment and sintering to obtain the aluminum oxide ceramic. The method disclosed by the invention is suitable for preparation and industrial production of the large-size aluminum oxide ceramic piece with low deformation, high precision and complex structure, and the prepared aluminum oxide ceramic has the advantages of few microdefects, high density, good mechanical and physical properties and the like.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing of ceramics with complex structures, and in particular relates to a method for preparing alumina ceramics based on sinking DLP photocuring 3D printing. Background technique [0002] Alumina ceramics are the most widely used ceramic materials, with a series of advantages of good insulation, thermal conductivity, mechanical strength, low dielectric loss, high temperature resistance and biocompatibility. With the rapid advancement of science and technology and the rapid improvement of manufacturing technology, alumina ceramic materials are more and more widely used in high-tech and cutting-edge industries, such as microelectronics, nuclear reactors, aerospace, magnetic fluid power generation, dental and bone healing applied medicine etc. The application of these high-tech and cutting-edge industrial alumina ceramic devices is not only extremely complex in structure, but also requires ...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622C04B35/638B33Y70/10B33Y10/00
CPCC04B35/10C04B35/622C04B35/638B33Y70/10B33Y10/00C04B2235/425C04B2235/6562C04B2235/6567C04B2235/6565C04B2235/77C04B2235/96Y02P10/25
Inventor 周新贵顾全超王洪磊余金山潘洪海
Owner NAT UNIV OF DEFENSE TECH
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