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Preparation method of high-porosity alumina porous ceramics

A technology of porous ceramics and high porosity, used in ceramic products, other household appliances, household appliances, etc., can solve problems such as limitation of scope, and achieve the effect of improving material strength, high porosity and convenient operation.

Inactive Publication Date: 2010-06-16
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The porosity and strength of alumina porous ceramics are always contradictory. At present, no good solution has been found. They often lose sight of one another in production and application, which ultimately limits the scope of its practical application.

Method used

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  • Preparation method of high-porosity alumina porous ceramics
  • Preparation method of high-porosity alumina porous ceramics
  • Preparation method of high-porosity alumina porous ceramics

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A preparation method of high-porosity alumina porous ceramics, the method steps are as follows,

[0025] (1) with MgCl 2 ·6H 2 O and stearic acid were used as raw materials, heated in a 78°C water bath with magnetic stirring for 20min to fully react to obtain a light yellow transparent sol. Stop heating and stirring, and naturally cool to room temperature to obtain a gel. The gel was heated at 70°C Dried for 24 hours to obtain magnesium stearate gel, i.e. magnesium xerogel;

[0026] (2) Weighing raw materials, the raw materials for preparing high-porosity alumina porous ceramics are by weight percentage, alumina powder: 74%, carbon powder: 15%, ethyl cellulose: 10%, magnesium xerogel: 1% .

[0027] (3) Mix the carbon powder and ethyl cellulose fully in advance for 20 minutes, grind the magnesium xerogel for 20 minutes before use, put the alumina powder, mixed carbon powder, ethyl cellulose, and ground magnesium xerogel into the ball mill After 2 hours of ball millin...

Embodiment 2

[0030] A preparation method of high-porosity alumina porous ceramics, the method steps are as follows,

[0031] (1) with MgCl 2 ·6H 2 O and stearic acid were used as raw materials, heated in a 90°C water bath with magnetic stirring for 40min to make it fully react, and a light yellow transparent sol was obtained. Stop heating and stirring, and naturally cool to room temperature to obtain a gel. Dried for 48 hours to obtain magnesium stearate gel, i.e. magnesium xerogel;

[0032] (2) with ZrOCl·8H 2 O, Y (NO 3 ) 2 ·8H 2 O, oxalic acid as raw material, heated in a 70°C water bath with magnetic stirring for 15min, the solution turned from milky white to light blue, and continued to stir for 2h to obtain a transparent light blue gel, moved to an open petri dish, and aged in a 70°C water bath After washing for 2 hours, washing with water and alcohol twice, and drying at 60°C for 14 hours, zirconium oxalate gel, namely zirconium xerogel, was obtained;

[0033] (3) Weighing ra...

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Abstract

The invention discloses a preparation method of high-porosity alumina porous ceramics, which belongs to the technical field of ceramic preparation. The preparation method comprises the steps of: adding a sintering auxiliary agent and an intensifier in form of xerogel; and subjecting alumina skeletal materials, carbon dust, an ethocel composite pore-forming agent, a zirconium xerogel intensifier and a magnesium xerogel sintering auxiliary agent, which serve as raw materials, to ball-milling mixing, compression molding and heat-insulating sintering, and then cooling the mixture to a room temperature to obtain alumina porous ceramics. The preparation method has the key point that on the basis of pore forming of the pore-forming agent, zirconium xerogel serving as the intensifier and magnesium xerogel serving as the sintering auxiliary agent are added to improve the porosity and strength of the alumina porous ceramics. The preparation method has a simple process and is convenient to operate; and the prepared high-porosity alumina porous ceramics contain two air holes of different sizes and maintain high bending strength.

Description

technical field [0001] The invention belongs to the technical field of ceramic preparation, in particular to a method for preparing porous alumina ceramics with high porosity. Background technique [0002] Porous ceramics is an inorganic non-metallic material with many interconnected or closed pores in the body. It has the advantages of high temperature resistance, corrosion resistance, high mechanical strength, good chemical resistance stability, and strong regeneration ability. Because of its separation, dispersion, absorption and fluid contact functions, it is widely used in various industrial sectors such as chemical industry, petroleum, smelting, textiles, pharmaceuticals, environmental protection, etc., and is increasingly valued by people. [0003] The pore-forming methods of alumina porous ceramics include adding pore-forming agents, organic foam impregnation, sol-gel methods, and foaming processes. The most commonly used method is to add pore-forming agents, and us...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B38/00C04B35/622
Inventor 梁小平王光辉李建新陆青樊小伟王荣涛
Owner TIANJIN POLYTECHNIC UNIV
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