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Preparation method of aluminium oxide honeycomb ceramics

A technology of honeycomb ceramics and alumina, which is applied in the field of materials, can solve problems such as difficult filtration, and achieve the effects of high production efficiency, convenient operation and control, and simple production process

Inactive Publication Date: 2014-10-01
BEIJING CENT FOR PHYSICAL & CHEM ANALYSIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the pores in the porous bodies and parts prepared in the above documents are closed pores, which are difficult to be used for filtration.

Method used

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  • Preparation method of aluminium oxide honeycomb ceramics
  • Preparation method of aluminium oxide honeycomb ceramics

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Example 1 Preparation of alumina honeycomb ceramic by extrusion molding and its properties

[0037] Take 216g of alumina powder with a particle size of 3μm, 60g of kaolin, and 9g of CaCO 3 , 9gBaCO 3 And 6g wollastonite, mix well to obtain a powder mixture. Mix water, polyvinyl alcohol and polyhydroxyglycolic acid at a weight ratio of 70:10:20, stir to obtain a uniform solution, mix the solution with the above powder mixture at a weight ratio of 100:70, and mix at room temperature and pressure. The mixing machine (BL-6175-B) is fully mixed at room temperature for 0.75 hours and aged for 3 hours at room temperature and pressure to obtain mud. The mud is filtered and purified through a 60-mesh sieve, and the honeycomb green is extruded through a honeycomb ceramic extruder (BL-6177), and dried at 40°C for 6 hours. After drying, the sample is degummed at 600°C to remove organic matter for 2 hours, and then discharged The glued green honeycomb is placed in a muffle furnace (BT...

Embodiment 2

[0039] Example 2 Preparation and properties of alumina honeycomb ceramics by gel injection molding

[0040] The monomer acrylamide and the crosslinking agent N,N'-methylenebisacrylamide are dissolved in water, the monomer concentration is 15wt%, and the crosslinking agent concentration is 0.5wt% to form a monomer premix. Add 140g of alumina powder with a particle size of 1μm, 40g of kaolin, and 6g of MgCO to the premix 3 , 6g BaCO 3 And 4g of talc, 2g of ammonium citrate as the dispersant, stir to obtain a homogeneous ceramic slurry, add 25μl of the catalyst N,N,N',N'-tetramethylethylenediamine to the above slurry, then stir evenly, and then Add 50μl of initiator 8% ammonium persulfate solution, stir well and then pour into the mold immediately, and insert the self-made multi-needle hole-forming mold (needle φ=2mm, 4 holes / cm2) into the slurry, and wait until the slurry is gel After being shaped, it is demoulded to obtain a honeycomb green body. Put the wet body in an oven at 50...

Embodiment 3

[0042] Example 3 Preparation and properties of alumina honeycomb ceramics by dry pressing

[0043] Combine 210g of alumina powder with a particle size of 3μm, 60g of kaolin, and 6g of BaCO 3 Mix it with 18g of dolomite powder uniformly, add alcohol and wet grinding with a grinding ball for 24 hours, dry and sieve, add 5wt% paraffin based on the sieved material as a forming agent, press in a steel mold to form a long sample (10cm in length) , Width 5cm, height 5cm), the pressure is 100MPa, and then press into the self-made multi-needle hole-forming mold (needle φ=2mm, 4 holes / cm²) and pull out to obtain a honeycomb body, and place the honeycomb body Put it in the debinding furnace and heat it up to 800℃ and keep it for 3 hours to dewax. Put the dry body into the muffle furnace (BTF-1700C) and heat it up to 1600℃ for 2.5 hours at a rate of 10℃ / min. The alumina honeycomb ceramic with the structure of "the inner wall of the pores stretched whiskers" is obtained. The SEM photos and X...

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Abstract

The invention discloses a preparation method of aluminium oxide honeycomb ceramics. The preparation method comprises the following steps: 1) preparing aluminium oxide honeycomb blank bodies with parallel pore passages; 2) dumping or degreasing the aluminium oxide honeycomb blank bodies; and 3) calcining the aluminium oxide honeycomb blank bodies to obtain the aluminium oxide honeycomb ceramics with pore passage inner wall extending whisker structures. The ceramic matrix part particles prepared by the method are tightly bonded and whiskers grow on the honeycomb pore inner walls. The honeycomb ceramics have the excellent properties such as high temperature resistance and chemical corrosion resistance and are suitable for filtration and purification of various fluids. According to the used honeycomb ceramics, filtered matters are easily removed by adopting various methods and the honeycomb ceramics can be reused. The preparation method is simple in process, is low in equipment requirements, is convenient in operation control, has high production efficiency and is suitable for large-scale industrial production.

Description

Technical field [0001] The invention relates to the technical field of materials, in particular, to a method for preparing an alumina honeycomb ceramic with a structure of "the inner wall of a pore channel extending whiskers". Background technique [0002] Honeycomb ceramics have a parallel and penetrating pore structure, which has the advantages of high osmotic pressure, large geometric surface, short diffusion distance, and is conducive to the counting of particles and gas discharge and reducing the filter volume. It is used in industrial waste gas, motor vehicle exhaust gas and other domestic waste gas. Filtration and purification, heat exchange in the metallurgical industry, filtration of molten metal, and purification of toxic gases and liquids in the mining industry have a wide range of applications. [0003] At present, the most mature preparation technology of honeycomb ceramics is extrusion molding, that is, molds are prepared according to the required honeycomb hole size ...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
Inventor 蔡锴邓平晔郭栋邹涛杨颖
Owner BEIJING CENT FOR PHYSICAL & CHEM ANALYSIS
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