Method for preparing porous alumina ceramic material through combination of 3D printing and reactive sintering

A porous alumina, ceramic material technology, applied in ceramic products, applications, other household appliances, etc., can solve the problem of high shrinkage, achieve accurate realization, good uniformity and pore connectivity, and controllable pore size and porosity Effect

Active Publication Date: 2015-03-04
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to overcome the defect of high shrinkage rate of porous ceramic materials prepared by 3DP technology. The present invention provides a method for preparing porous alumina ceramic materials by combining 3D printing with reaction sintering

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  • Method for preparing porous alumina ceramic material through combination of 3D printing and reactive sintering
  • Method for preparing porous alumina ceramic material through combination of 3D printing and reactive sintering
  • Method for preparing porous alumina ceramic material through combination of 3D printing and reactive sintering

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preparation example Construction

[0025] The invention discloses a method for preparing a porous alumina ceramic material, which comprises the following steps: selecting a spherical metal aluminum powder prepared by an atomization method, preparing a porous aluminum body through a rapid prototyping process of a 3D printer, and oxidizing in an air atmosphere and Sintering obtains a porous alumina ceramic material. The invention provides a method with simple process and low cost to prepare porous alumina ceramics with complex shape and excellent performance, and has the advantages of forming and sintering in close size.

[0026] The invention provides a method for preparing a porous alumina ceramic material, which specifically includes the following steps:

[0027] (a) adding aluminum powder to a commercial three-dimensional printer feeding box;

[0028] (b) Load the three-dimensional image that needs to be printed in the computer, and start printing after adjusting the printing parameters;

[0029] (c) The pr...

Embodiment 1

[0041] (1) 10 ~ 25μm Al powder (such as figure 1 Shown in middle a) add in commercial three-dimensional printer feeding box;

[0042] (2) The printing parameters are adopted as layer thickness 50 μm, binder saturation is 80%, binder is a mixture of 15% ethylene glycol and 85% ethylene glycol monobutyl ether, and the drying time is 60 s;

[0043] (3) The printed porous body is cured in an oven at 120°C for 24 hours;

[0044] (4) Put the cured sample into a muffle furnace for 2°C / min to 600°C to remove the binder (hold for 2 hours), 1°C / min to 1400°C for oxidation (hold for 6 hours), 5°C / min increased to 1600°C for sintering (4 hours of heat preservation), and finally obtained porous alumina ceramics with a bending strength of 74.8Mpa, a porosity of 45%, and a sample size increase of 0.6%;

[0045] From figure 2 It can be seen that the aluminum powder is completely oxidized, and the final product is an alumina ceramic material; from Figure 4 It can also be seen from the p...

Embodiment 2

[0047] (1) Add 10-25 μm Al powder into a commercial 3D printer feeding box;

[0048](2) The printing parameters are adopted as layer thickness 100 μm, binder saturation is 120%, binder is a mixture of 15% ethylene glycol and 85% ethylene glycol monobutyl ether, and the drying time is 90s;

[0049] (3) The printed porous body is cured in an oven at 120°C for 24 hours;

[0050] (4) Put the cured sample into a muffle furnace for 1°C / min to 600°C to remove the binder (hold for 2 hours), 1°C / min to 1400°C for oxidation (hold for 12 hours), 5°C / min increased to 1600°C for sintering (holding temperature for 2 hours), and finally obtained porous alumina ceramics with a bending strength of 71.3Mpa, a porosity of 44%, and a sample size increase of 0.8%;

[0051] From figure 2 It can be seen that the aluminum powder is completely oxidized, and the final product is an alumina ceramic material; from image 3 It can be seen that the green body particles are densely packed, and there is...

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Abstract

The invention relates to a method for preparing a porous alumina ceramic material through combination of 3D printing and reactive sintering. The method comprises the following steps: 1) adding aluminium powder or aluminium alloy powder into a feeding box of a three-dimensional printer, and printing porous biscuit through the three-dimensional printer; 2) performing processes of solidification, debonding, oxidation and sintering in sequence on the porous biscuit prepared in the step 1) so as to obtain the porous alumina ceramic material.

Description

technical field [0001] The invention relates to a method for preparing a porous alumina ceramic material, which belongs to the technical field of porous ceramic material preparation. Background technique [0002] Porous alumina ceramics have light weight, high permeability, chemical corrosion resistance, friction resistance, low expansion coefficient and good high temperature stability, and have broad application prospects in high temperature gas and liquid filtration, catalyst carriers, heat insulation materials and other fields. According to the specific application requirements in different fields, the porosity and pore size of porous alumina ceramics can be designed, and there are many reports on related preparation methods. For example, porous alumina ceramics with porosity>50% are prepared by using alumina as aggregate, carbon powder and ethyl cellulose composite pore-forming agent (Chinese Patent, Patent No. CN101734909A). Aluminum nitrate, citric acid and water a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/10C04B35/622
Inventor 曾宇平姚冬旭
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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