Preparation method of nanocomposite Al2O3 ceramic filter element

A ceramic filter element and al2o3 technology, applied in the field of preparation of Al2O3 ceramic products, can solve the problems of decreased ceramic strength, low air permeability, uneven distribution of ceramic pores, etc., and achieve improved air permeability and strength, high filtration accuracy, and good air permeability. Effect

Inactive Publication Date: 2013-10-09
XI AN JIAOTONG UNIV
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Problems solved by technology

But now on the market Al 2 o 3 The particle size distribution range of the powder is relatively wide, and the shape is irregular, resulting in porous Al 2 o 3 The pores of ceramics are unevenly distributed, the air permeability is small, and the strength of ceramics decreases

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  • Preparation method of nanocomposite Al2O3 ceramic filter element
  • Preparation method of nanocomposite Al2O3 ceramic filter element
  • Preparation method of nanocomposite Al2O3 ceramic filter element

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Embodiment Construction

[0024] see figure 1 , the invention's high-strength, nanocomposite Al 2 o 3 Ceramic filter elements (filter tubes) including micron-sized spherical alumina (Al 2 o 3 ) powder extrusion molding and sintering containing macroscopic straight pores porous matrix 1, the nanocomposite phase of macroscopic straight pores (Al 2 o 3 —ZrO 2 ) Coat 2. The filter element (filter tube) should be in direct contact with the filtrate, so the entire filter element is required to have the characteristics of high temperature resistance, corrosion resistance, thermal shock resistance, and good air permeability.

[0025] Micron Al 2 o 3 The sintered porous material of the matrix has a relatively large pore size and good air permeability, and is used as a supporting material. In order to improve the filtration accuracy, a nano-scale composite ceramic coating is attached to the wall of the straight hole to perform high-precision filtration, so that the filtration accuracy can reach the nano...

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Abstract

The invention discloses a preparation method of a nanocomposite Al2O3 ceramic filter element with high strength. The preparation method is characterized by comprising the following steps of: firstly, preparing an Al2O3 porous matrix with macroscopic straight pores; and secondly, preparing a porous nannocomposite coating on the walls of the macroscopic straight pores of the Al2O3 porous matrix, wherein the second step comprises the following concrete steps of: (1) dissolving aluminum isopropoxide into distilled water with the temperature of 70-90 DEG C, stirring the solution, and adding nitric acid to control the pH value, wherein the aluminum isopropoxide is hydrolyzed to form a sol; (2) carrying out ultrasonic treatment at the temperature of 40 DEG C under one atmospheric pressure, and ageing the sol; (3) completely immersing the sintered Al2O3 porous matrix with the macroscopic straight pores into the aged sol, impregnating, lifting, and then carrying out freeze drying so that the sol becomes a gel; (4) carrying out thermal treatment on the gel at the temperature of 500-600 DEG C, and then, cooling along with a furnace; and (5) finally, sintering the gel at the temperature of 900-1100 DEG C to obtain the nanocomposite Al2O3 ceramic filter element.

Description

technical field [0001] The present invention relates to a kind of Al that can be used in food, medical industry as filter element or filter tube 2 o 3 Method for the preparation of ceramic articles. Background technique [0002] al 2 o 3 Ceramic filter elements (filter tubes) have the advantages of high temperature resistance, wear resistance, corrosion resistance, low cost, etc., and have broad application prospects in petroleum, chemical, environmental protection, food, pharmaceutical and other fields. However, for many fine chemical filtration, the filtration accuracy is required to reach the nanometer level and have a high air permeability. [0003] Using the general traditional porous ceramic preparation technology, the pore size is at the micron level, and it is difficult to achieve high-precision filtration. If uniform nanoporous Al is used 2 o 3 It is not difficult to achieve the filtration accuracy and maximum pore size of ceramics at the nanometer level (30-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/10C04B41/87
Inventor 金志浩王红洁代丽娜金海云刘荣臻
Owner XI AN JIAOTONG UNIV
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