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A method for preparing hierarchically porous materials using direct writing molding technology

A technology of direct writing molding and multi-level holes, which is applied in the field of 3D printing molding to achieve the effect of easy adjustment, good control and wide application range

Inactive Publication Date: 2021-01-26
文昌会文鑫博睿信息科技中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some progress has been made in the synthesis of hierarchical porous materials, problems closely related to practical applications, such as the controllability of hierarchical pores, the connectivity of pore structures, and the stability of product quality, still exist in the research of hierarchical porous materials. facing great challenges

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of ZrO 2 The steps for hierarchical porous materials are as follows:

[0027] (1) The dispersant sodium polyacrylate (5g) and YSZ (3 moles Y 2 o 3 Stable ZrO 2 ) powder (260g, D50 is 0.8μm) was added to 50mL deionized water for ball milling for 12h, then added emulsifier butyrate mono-diglyceride (10g) ball milled for 5h, left standing for 24h, and high-speed shear emulsification for 10min to obtain emulsification ZrO 2 slurry. Wherein, the grinding ball is a zirconia ball of 300g, the ball milling speed is 15 rad / min, and the shearing speed is 1000 rad / min;

[0028] (2) ZrO will be obtained 2 The emulsified slurry is directly written into a multi-level porous material green body. The temperature is controlled at about 30°C and the humidity is controlled at 65%. Direct writing molding pressure is 30PSI; print head moving speed is 12mm / sec;

[0029] (3) Immerse the shaped body in kerosene for 24 hours, then dry it for 12 hours at a humidity of 60% an...

Embodiment 2

[0031] Preparation of Al 2 o 3 The steps for hierarchical porous materials are as follows:

[0032] (1) Polyacrylic acid (6g) and Al 2 o 3 Powder (320g, D50 is 0.8μm) and sintering aid MgO (3.2g) were added to 120mL deionized water for ball milling for 20 hours, then emulsifier butyric acid (5g) was added for ball milling for 10 hours, stood for 2 days, and then sheared at high speed Emulsified for 15 minutes to obtain emulsified Al 2 o 3 slurry. Wherein, the grinding ball is a 350g alumina ball, the ball milling speed is 20 rad / min, and the shearing speed is 800 rad / min;

[0033] (2) will emulsify Al 2 o 3 The slurry is subjected to direct writing molding to obtain a multi-level porous material green body. The temperature is controlled at around 23°C and the humidity is controlled at 70%. Direct writing molding pressure is 50PSI; print head moving speed is 10mm / sec;

[0034] (3) Dip the formed body in diesel oil for 30 hours, then dry it for 20 hours at a humidity ...

Embodiment 3

[0036] The steps of preparing AlN hierarchical porous material are as follows:

[0037] (1) Ammonium polyacrylate (8g) and AlN powder (350g, D50 is 2μm) sintering aid Y 2 o 3 (3g) with La 2 o 3 (2.1g) was added to 100mL deionized water for 18 hours, and then the emulsifier dimethylolbutyric acid (2g) was added for ball milling for 10 hours, left to stand for 2d, and then emulsified by high-speed shear for 15min to obtain emulsified AlN slurry. Wherein, the grinding ball is a 500g zirconia ball, the ball milling speed is 12 rad / min, and the shearing speed is 2000 rad / min;

[0038] (2) The obtained emulsified AlN slurry is subjected to direct writing molding to obtain a multi-level porous material green body. The temperature is controlled at around 32°C and the humidity is controlled at 76%. Direct writing molding pressure is 40PSI; printing head moving speed is 120mm / sec;

[0039] (3) Immerse the formed body in vegetable oil for 36 hours, then dry it for 38 hours at a hum...

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PUM

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Abstract

The invention belongs to the technical field of 3D printing and molding, and discloses a method for preparing a multi-level porous material using a direct writing molding technology, that is, firstly preparing a powder slurry, and then adding one or more emulsifiers to the slurry, The rheological properties of the slurry are adjusted by emulsification, and finally the slurry is used to prepare a hierarchical porous material. The invention can not only adjust the rheological properties of the powder slurry to meet the requirements of direct writing molding technology, but also meet the requirements of 3D printing and forming multi-level porous materials. The invention can also easily adjust the pore diameter and pore volume of multi-level porous materials. and porosity.

Description

technical field [0001] The invention belongs to the technical field of 3D printing molding, and in particular relates to a method for preparing a multi-level porous material by using a direct writing molding technology. Background technique [0002] Due to its low thermal conductivity, low dielectric constant, large specific surface area, high strength, wear resistance, high temperature resistance, and corrosion resistance, porous materials are widely used in environmental protection, energy, chemical, biological and other fields. Porous materials can be divided into microporous materials (<2nm), mesoporous materials (2nm ~ 50 nm) and macroporous materials (>50nm) according to the pore size. Hierarchical porous materials are materials that contain different levels of pores such as micropores, mesopores or macropores. The pore size of the multi-level porous material is distributed step by step from large to small, and the pore structure of each level is a pore material...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/117C04B35/488C04B35/582C04B35/626C04B35/622C04B38/10C04B38/00B28B1/00B33Y10/00B33Y70/10
CPCB28B1/001B33Y10/00B33Y70/00C04B35/117C04B35/488C04B35/581C04B35/622C04B35/6261C04B35/62625C04B35/6263C04B38/10C04B2235/3206C04B2235/3225C04B2235/3227C04B2235/616C04B2235/6562C04B2235/6567C04B38/00
Inventor 王小锋于凯
Owner 文昌会文鑫博睿信息科技中心
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