Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Porous alumina ceramic, and preparation method and application thereof

A technology of porous alumina and phase alumina, which is applied in the field of porous ceramic materials, can solve the problems of difficult regulation of porosity and pore size distribution, complicated preparation process, unsuitable for fine particle filtration and gas-liquid phase separation, etc., and achieves good application prospects. , the effect of good compressive strength

Inactive Publication Date: 2015-06-03
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
View PDF3 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the pore-forming agent method can prepare porous ceramics with controllable pore size and shape, and the porosity can be adjusted in a wide range. However, the pores of the porous ceramics prepared by this method are generally closed pores, so they are not suitable for separation and filtration. and other fields
The template impregnation method is suitable for the preparation of porous ceramics with relatively high porosity (generally greater than 60%), and the pores are open and connected structures, which are suitable for filtration and separation of liquid metals, etc., but the pore size is limited by the template, generally larger ( hundreds of microns), so it is not suitable for fine particle filtration and gas-liquid phase separation
Freeze-drying method can prepare porous ceramics with directional distribution of pore size, but its preparation process is complex and not suitable for large-scale sample preparation
The low-temperature sintering method is to sinter the compacted powder. During the sintering process, the sintering is stopped when the sintering neck begins to form. This method can prepare porous ceramics with three-dimensional connectivity, but its porosity and pore size distribution are difficult to control.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Porous alumina ceramic, and preparation method and application thereof
  • Porous alumina ceramic, and preparation method and application thereof
  • Porous alumina ceramic, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this embodiment, the structure of the porous alumina ceramic material is: α-phase alumina is used as the matrix, and a plurality of pores connected in three dimensions are distributed in it, and the pore diameter is distributed in a dual mode, that is, the plurality of pores are divided into two types according to their pore diameters. , one is small pores with a pore diameter of 60nm to 150nm, and the other is a large pore with a pore diameter of 2um to 5um; in terms of volume percentage, in the porous alumina ceramic material, the volume of large pores accounts for 10%, and the volume of small pores Accounted for 41%.

[0037] The preparation method of above-mentioned porous alumina ceramic material is as follows:

[0038](1) The γ-phase alumina powder with a particle size of 10nm to 100nm is used as the matrix powder, and activated carbon powder with a particle size of 2um to 5um is added as a pore-forming agent powder. The volume ratio of the pore-forming agent p...

Embodiment 2-7

[0044] In Examples 2-7, the structure of the porous alumina ceramic material is basically the same as that of Example 1, except that the volume percentage of macropores is shown in Table 1 below.

[0045] The preparation method of the porous alumina ceramic material is basically the same as that in Example 1, except that the volume content of the pore-forming agent powder and the sintering temperature are shown in the table below. That is, by adjusting the volume content of the pore-forming agent and the sintering temperature, the ratio of large pores to small pores in the bimodal porous alumina ceramic material can be adjusted, thereby preparing porous ceramics with different porosity.

Embodiment 8-9

[0047] In Examples 8-9, the structure of the porous alumina ceramic material is: α-phase alumina is used as the matrix, and a plurality of pores connected in three dimensions are distributed therein. 60nm to 150nm; in terms of volume percentage, the pores in the porous alumina ceramic material respectively account for 50% and 36% of the total volume.

[0048] The preparation method of this porous alumina ceramic material is basically the same as the preparation method in Example 1, the difference is that no pore-forming agent powder is added to the matrix powder, so when the sintered bulk material is mechanically processed into the desired shape No porogen removal process is required. For specific process parameters, please refer to Table 1 below.

[0049] Table 1: Process parameters for preparing porous alumina ceramic materials in Examples 1-9

[0050] Example

[0051] 2

[0052] The porous alumina ceramic material obtained in the above-mentioned exampl...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
pore sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
Login to View More

Abstract

The invention provides a porous alumina ceramic with three-dimensional intercommunicating-pore-structure and dual-mode pore size distribution. The preparation method comprises the following steps: by using amorphous alumina, transitional-phase alumina or corundum-phase alumina powder with the particle size of 10-200nm as the raw material powder, adding pore forming agent powder with the particle size of greater than 500nm, uniformly mixing, forming, sintering, processing into the required shape, and removing the pore forming agent. The porous alumina ceramic material has the dual-mode-distribution three-dimensional interlocking-pore structure, has favorable compression strength, thus, can be used as a filter separation material, an adsorbent carrier, a catalyst support, a microwave absorber carrier, artificial bone, a thermal-insulation material and the like, and has favorable application prospects.

Description

technical field [0001] The invention relates to the technical field of porous ceramic materials, in particular to a porous alumina ceramic with a three-dimensional through-open pore structure and dual-mode pore size distribution and a preparation method thereof. The ceramic material can be applied to filtration, separation, catalyst carrier, artificial bone, Insulation materials, microwave absorber carriers and other fields. Background technique [0002] Porous ceramics have the advantages of acid and alkali corrosion resistance, high temperature resistance, high strength, etc., and are widely used in technical fields such as filtration, separation, catalyst carrier, artificial bone, refractory insulation material, microwave absorber carrier, etc. [0003] In the field of filtration and separation, in order to realize the functions of filtration and separation, it is necessary to introduce three-dimensional interconnected holes in the ceramic matrix, but the pore diameters r...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B38/04C04B35/10
Inventor 黄庆申璐周小兵周洁叶群陈科
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com