Method for preparing porous alumina ceramic supporting body with sol as additive

A porous alumina and support technology is applied in the field of preparing porous Al2O3 ceramic supports, which can solve the problems of reduced acid and alkali resistance and high temperature resistance, easy to form agglomeration, difficult to disperse uniformly, etc., so as to shorten the production cycle and solve the problem of cracking. problem, good effect

Inactive Publication Date: 2009-04-22
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0011] The purpose of the present invention is to improve the method of using low-melting glass phase as sintering aid in the preparation of the existing porous alumina ceramic support body, and then solve the problem of chemical instability, especially the reduction of acid and alkali resistance and high temperature resistance; The method of adding ultra-fine ceramic particles is easy to form agglomeration and is not easy

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  • Method for preparing porous alumina ceramic supporting body with sol as additive
  • Method for preparing porous alumina ceramic supporting body with sol as additive
  • Method for preparing porous alumina ceramic supporting body with sol as additive

Examples

Experimental program
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Effect test

Example Embodiment

[0029] One, the preparation method of aluminum sol:

[0030] Aluminum sol A: The raw material is aluminum chloride hexahydrate AlCl 3 ·6H 2 O, aluminum powder, hydrochloric acid. AlCl 3 ·6H 2 O is mixed with hydrochloric acid, and then gradually add aluminum powder to the above mixed solution, keep the temperature at 70-80°C, stir in a magnetic stirrer for 6 hours, and obtain a transparent colloidal liquid, that is, Al(OH) 4 The sol has a mass percent concentration of alumina of 20% and a particle diameter of 20-25 nanometers. The ratio of each reactant is that the molar ratio of hydrochloric acid to water is 0.21, and the pH value in the reaction process is 3-5, which can be adjusted with hydrochloric acid and ammonia water. The molar ratio of aluminum powder to aluminum chloride hexahydrate is 1.76.

[0031] Aluminum sol B: The raw materials are aluminum powder, nitric acid, and ammonia water. For the preparation of aluminum treatment solution, add 8g / L pure aluminum ...

Example Embodiment

[0041] Embodiment 1——aluminum sol A is used as auxiliary agent to prepare porous alumina support body:

[0042] (1) 30 micron α-Al 2 o 3 The micropowder was weighed as an aggregate, and the α-Al 2 o 3 Based on the quality of micropowder, add binder HPMC6%, plasticizer polyethylene glycol (6000) 8%, dispersant sodium stearate 2%, pore-forming agent cornstarch 4%, do not add ball with planetary ball mill Dry mix for 3 hours.

[0043] (2) With aggregate α-Al 2 o 3 Based on the quality of the fine powder, add 10% aluminum sol A and water into the dry-mixed uniform mixture to make mud.

[0044] (3) Practicing the mud 5-10 times in a vacuum mud refining machine; encapsulating the mud material of the practiced mud in a package bag with a relative humidity of 80-90% and aging for 24 hours. Extrude 19 channels with a length of 100 cm (outer diameter 28-32 cm, channel diameter 3.5-4.0 cm, channel wall aperture 5-15 microns) and 50 cm 37 channels (outer diameter 40 cm, Channel di...

Example Embodiment

[0047] Embodiment 2——aluminum sol B is used as auxiliary agent to prepare porous alumina support body:

[0048] (1) 20 micron α-Al 2 o 3 The micropowder was weighed as an aggregate, and the α-Al 2 o 3 Based on the quality of micropowder, add binder HPMC8%, plasticizer polyethylene glycol (6000) 6%, dispersant sodium stearate 4%, pore-forming agent cornstarch 6%, do not add ball with planetary ball mill Dry mix for 2 hours.

[0049] (2) With aggregate α-Al 2 o 3Based on the quality of the fine powder, add 20% aluminum sol A and water into the dry-mixed uniform mixture to make mud.

[0050] (3) Practicing the mud 5-10 times in a vacuum mud refining machine; encapsulating the mud material of the practiced mud in a package bag with a relative humidity of 80-90% and aging for 24 hours. Extrude 19 channels with a length of 100 cm (outer diameter 28-32 cm, channel diameter 3.5-4.0 cm, channel wall aperture 5-15 microns) and 50 cm 37 channels (outer diameter 40 cm, Channel dia...

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Abstract

The invention discloses a method for preparing a porous alumina ceramic support body by using a colloidal sol as an addition agent, which comprises the following steps: adopting a low cost method to prepare the colloidal sol; adding the colloidal sol into mixed dry powder on the basis of aluminum oxide aggregate; and performing the processes of pugging, molding, sintering and the like to obtain a multi-channel pipe type or honeycomb type porous alumina ceramic support body. The method uses the colloidal sol as a caking agent, a sintering addition agent, and a performance improver, and makes use of the caking property of the colloidal sol, thus the dosage of organic caking agent can be reduced remarkably to solve the problem of easy cracking of binder removal sintering; and with the fine particles of the colloidal sol as the sintering addition agent, the sintering temperature can be reduced, and the dissolvability of the particles are improved, thus the sintered product does not have glass phase through microscopic analysis. The prior preparation method adopting low melting point glass phase as the sintering addition agent is improved, and the acid resistance, the alkali resistance and the high temperature strength of the porous alumina ceramic support body are improved.

Description

technical field [0001] The invention relates to a method for preparing a porous alumina ceramic body, in particular to a method for preparing porous Al oxides with sol as an auxiliary agent. 2 o 3 Method for Ceramic Supports. Background technique [0002] Porous materials have unique properties compared to dense materials. In the last century, more and more fields required porous materials, such as in molten metal filtration, high temperature thermal insulation, support for catalytic reactions, diesel engine exhaust gas filtration, high temperature and high pressure Exhaust gas filtration and other fields. [0003] Inorganic ceramic membranes have some advantages that polymer or metal separation membranes cannot match: high temperature resistance, online disinfection; good chemical stability, and resistance to microbial degradation. Good stability against organic solvents, corrosive gases and microbial attack. High mechanical strength, high pressure resistance, good wear...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
Inventor 武海军杨建锋高积强黄佐财张杨姜广鹏张亚彬
Owner XI AN JIAOTONG UNIV
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