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Composite ceramic powder and ceramic forming method

A technology of composite ceramics and ceramic powder, which is applied in the field of additive manufacturing, can solve problems such as increased layer-to-layer stacking direction errors, difficulty in forming parts, and increased number of printing layers, achieving increased transmission depth, uniform transmission, refraction and The effect of increased transmittance

Active Publication Date: 2018-01-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional light-curing molding technology is selective to the type of ceramic powder, mainly using ceramic materials such as silicon oxide or zirconia. When using other materials for light-curing molding, the printing layer thickness needs to be set thinner during the molding process, resulting in the same size Parts need to be printed with an increase in the number of layers, which makes it difficult to form the parts that need to be printed, and the error in the layer-to-layer stacking direction increases, which limits the development of ceramic light-curing molding technology to a certain extent.

Method used

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  • Composite ceramic powder and ceramic forming method
  • Composite ceramic powder and ceramic forming method

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Example 1 Preparation of composite ceramic powder by precipitation method

[0063] SiC powder, butyl titanate with a mass fraction of 50%-80% of SiC, and absolute ethanol with a mass fraction of 1-4 times SiC are added to the container, and are thoroughly mixed with a ball mill. Add deionized water under vigorous stirring to control the molar ratio of butyl titanate to deionized water n(Ti):n(H 2 O) is 1:150. A precipitate formed at room temperature, filtered and washed. TiO is formed after drying at 80°C 2 Coated SiC particles.

Embodiment 2

[0064] Example 2 Preparation of composite ceramic powder by hydrolysis method

[0065] In the first step, methoxyethanol and tetraisopropyl titanate are added to the anhydrous isopropanol solution, and the solution is simmered at 75°C-85°C for 1h-3h and then loaded into a volumetric flask for use. The molar ratio of methoxyethanol to tetraisopropyl titanate is 4:1. In the second step, add 3g-5g of SiC powder to the beaker, add 100ml-200ml of anhydrous isopropanol, add 20ml-50ml of deionized water, dropwise add the solution prepared in the first step, 75℃-85 ℃ migrating 0.5h-3h to form TiO 2 Coated SiC particles.

Embodiment 3

[0066] Example 3 Preparation of composite ceramic powder by heterogeneous nucleation method

[0067] Fully disperse the SiC powder in a solution containing a dispersant, add Al(NO) 3 ) 3 , AlCl 3 , Al 2 (SO 4 ) 3 The solution is vigorously stirred, and at the same time, ammonia water is added to control the pH value, so that SiC becomes the core of the sol generation and generates Al(OH) 3 The coated SiC is precipitated, and then filtered and dried to obtain Al 2 O 3 Coated SiC particles.

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Abstract

The invention provides composite ceramic powder which is used for photo curing. The composite ceramic powder comprises a ceramic powder body and a wrapping lawyer wrapping the ceramic powder body, andthe color of the wrapping layer is lighter than that of the ceramic powder body. The invention further provides a ceramic forming method. The method comprises the steps that the composite ceramic powder which is used for photo curing is provided; ceramic slurry with the composite ceramic powder is prepared; a three-dimensional solid model of parts to be printed is established, the thickness of aprinting layer is determined, and the three-dimensional solid model is layered according to the layer thickness; the ceramic slurry is subjected to photo curing three-dimensional printing, and part bodies are prepared.

Description

technical field [0001] The invention relates to the field of additive manufacturing, in particular to a composite ceramic powder and a ceramic molding method. Background technique [0002] Ceramic material has the properties of high strength, high hardness, wear resistance, corrosion resistance, etc. It is an important engineering material and has a wide range of applications in aerospace, petrochemical, national defense and civil industries. The traditional preparation process generally uses a mold to support the powder material to the green body, and then sinters at a high temperature to obtain a ceramic component. This preparation method is limited by the mold making, which greatly restricts the development needs of the refinement and complication of ceramic components. The 3D printing technology developed in recent years enables material molding to achieve mold-free production. [0003] Among them, the light-curing rapid prototyping technology is one of the methods wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/628B33Y10/00B33Y70/00
Inventor 吕志刚赵炬颖胡可辉
Owner TSINGHUA UNIV
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