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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, especially for large-scale ceramics. The degreasing problem of dimension parts has not been solved
[0009] Therefore, there is an urgent need to develop a method for preparing large-scale high-performance alumina ceramics, and to explore a reasonable green body degreasing process technology to solve various technical defects or problems that mainly exist in the 3D printing of alumina ceramics in the prior art: The printing slurry has low solid content and insufficient stability; printing of large-sized parts is limited, the molding accuracy is not high, the efficiency is low, the shrinkage deformation is large, and the finished product is uneven; degreasing is easy to produce bubbling and cracks, degreasing residual carbon and impurity components affect subsequent sintering Stability and sintered body performance; variability of sintered products, poor dimensional accuracy, low density, low mechanical and mechanical properties, high preparation costs, and difficulties in industrialization, etc.

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

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Embodiment 1

[0042] A method for preparing alumina ceramics based on sinking DLP photocuring 3D printing of the present invention, such as figure 1 shown, including the following steps:

[0043] S1. Preparation of light-cured alumina ceramic paste with high solid content, high stability and high molding precision:

[0044] (1) Take three kinds of α-spherical alumina powders with a particle size of 10 μm, 3 μm and 300 nm and add them to the ethanol solution according to the ratio of 40wt%, 50wt% and 10wt%, respectively. In this embodiment, the α-spherical alumina powder is 800g in total; α Spherical alumina powder mass meter, drop 2wt% dispersant KOS-110, after ultrasonic stirring and mixing for 2 hours, dry the mixture in a vacuum oven at 80°C for 24 hours to remove alcohol, and the dried alumina The powder is ground and pulverized and passed through an 80-mesh sieve to obtain α-spherical alumina powder after surface modification treatment.

[0045] (2) acrylic photosensitive resin is ad...

Embodiment 2

[0055] A method for preparing alumina ceramics based on sinking DLP light-curing 3D printing of the present invention comprises the following steps:

[0056] S1. Preparation of light-cured alumina ceramic paste with high solid content, high stability and high molding precision:

[0057] (1) Take three kinds of α-spherical alumina powders with particle diameters of 12 μm, 3 μm and 500 nm and add them to the ethanol solution according to the ratio of 55wt%, 25wt% and 20wt%, respectively. In this embodiment, the α-spherical alumina powders total 800g; α Spherical alumina powder mass meter, drop 3wt% dispersant BYK-111, after ultrasonic stirring and mixing for 3 hours, dry the mixture in a vacuum drying oven at 70°C for 30 hours to remove alcohol, and the dried alumina The powder is ground and crushed and passed through a 60-mesh sieve to obtain α-spherical alumina powder after surface modification treatment.

[0058] (2) Add acrylic photosensitive resin to the spherical ink tank...

Embodiment 3

[0068] A method for preparing alumina ceramics based on sinking DLP light-curing 3D printing of the present invention comprises the following steps:

[0069] S1. Preparation of light-cured alumina ceramic paste with high solid content, high stability and high molding precision:

[0070] (1) Take three kinds of α-spherical alumina powders with a particle size of 8 μm, 4 μm and 200 nm and add them to the ethanol solution according to the ratio of 65wt%, 27wt% and 8wt%, respectively. In this embodiment, the α-spherical alumina powder is 800g in total; α spherical alumina powder mass, drop 1.3wt% dispersant TEG-0685 and 0.8wt% dispersant oleic acid, after ultrasonic stirring and mixing for 3.5h, dry the mixture in a vacuum oven at 95°C After 20 hours to remove alcohol, the dried alumina powder was ground and crushed and passed through a 100-mesh sieve to obtain α-spherical alumina powder after surface modification.

[0071] (2) acrylic photosensitive resin is added in the spheric...

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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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