Method for preparing aluminum oxide porous ceramics by gel-foaming method

A technology of porous ceramics and alumina, applied in the field of porous ceramic materials, can solve the problem that open-pore ceramics are not suitable for thermal insulation materials, etc., and achieve the effect of uniform pore size distribution

Inactive Publication Date: 2014-02-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the current research focuses on the method of adding pore-forming agents and gel injection molding. The pores of the porous ceramics prepared by this method are mainly open pores, and open-pore ceramics are not suitable for use as thermal insulation materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: The method for preparing high-performance alumina porous ceramics by using the gel-foaming method is as follows: firstly use alumina powder as a raw material, add organic monomers, crosslinking agents, dispersants, and sintering aids, foaming agents and foam stabilizers agent, the slurry is prepared, and then through the processes of molding, drying, debinding and sintering, the alumina porous ceramic material is obtained. Concrete preparation steps are as follows:

[0022] (1) Preparation of slurry: under normal temperature and pressure, mix N-methylolacrylamide with a concentration of 0.5mol / l, N, N'-methylenebisacrylamide with a concentration of 0.8mol / l, dispersant MA-AA Mix and stir with water according to the mass ratio of 5:1:5:68, then add ammonia water with a concentration of 3mol / l, adjust the pH value of the mixed solution to 8.5, and obtain the premixed solution, then press 15:65:2: 0.5:0.3 mass ratio, add alumina powder with a particle size of ...

Embodiment 2

[0027] Example 2: The method for preparing high-performance alumina porous ceramics by using the gel-foaming method is as follows: firstly use alumina powder as a raw material, add organic monomers, crosslinking agents, dispersants, and sintering aids, foaming agents and foam stabilizers agent, the slurry is prepared, and then through the processes of molding, drying, debinding and sintering, the alumina porous ceramic material is obtained. Concrete preparation steps are as follows:

[0028] (1) Preparation of slurry: under normal temperature and pressure, mix N-methylolacrylamide with a concentration of 8mol / l, N, N'-methylenebisacrylamide with a concentration of 6mol / l, dispersant PAAS and water, according to Mix and stir evenly at a mass ratio of 20:2:10:89, then add ammonia water with a concentration of 4mol / l, adjust the pH value of the mixed solution to 10.5, and obtain a premixed solution, then press the ratio of 32.5:82:5:2:2 Mass ratio, adding alumina powder with a...

Embodiment 3

[0033] Example 3: The method for preparing high-performance alumina porous ceramics by using the gel-foaming method is as follows: firstly use alumina powder as a raw material, add organic monomers, crosslinking agents, dispersants, and sintering aids, foaming agents and foam stabilizers agent, the slurry is prepared, and then through the processes of molding, drying, debinding and sintering, the alumina porous ceramic material is obtained. Concrete preparation steps are as follows:

[0034] (1) Preparation of slurry: under normal temperature and pressure, mix N-methylolacrylamide with a concentration of 10mol / l, N, N'-methylenebisacrylamide with a concentration of 10mol / l, dispersant TH-241 and water , mix and stir evenly according to the mass ratio of 10:1.3:7:72, then add ammonia water with a concentration of 1mol / l, adjust the pH value of the mixed solution to 9, and obtain the premixed solution, then press 30:70:3:1: A mass ratio of 1.6, adding alumina powder with a pa...

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PUM

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Abstract

The invention provides a method for preparing aluminum oxide porous ceramics by combining the gel-casting method and the foaming method, belonging to the technical field of porous ceramics material. The invention prepares a porous aluminum oxide ceramic with a high porosity, high strength and particularly a high closed porosity by implementing processing steps like preparing slurry, molding, drying, discharging glue and sintering. The method is a near clear dimension in-situ forming method. The prepared blank has a higher strength and can be reprocessed, and is suitable to prepare porous ceramic products with higher dimensions and complicated shapes.

Description

technical field [0001] The invention relates to a gel-foaming method for preparing high-performance alumina porous ceramics, which belongs to the technical field of porous ceramic materials. Background technique [0002] Porous ceramics are widely used in thermal insulation materials, filters, catalyst carriers, biological materials due to their excellent performance in chemical stability, permeability, mechanical properties, high temperature oxidation resistance and thermal shock resistance. , fuel cell materials, heat exchangers, etc. [0003] Alumina ceramics, also known as corundum, are high-temperature structural ceramics with the most extensive uses, the most abundant raw materials, and the cheapest price; A1 2 o 3 Ceramics are one of the materials with the most stable chemical properties and the highest mechanical strength among refractory oxides; A1 2 o 3 Ceramics do not react with most molten metals, only Mg, Ca, Zr and Ti can reduce them above a certain tempera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/02
Inventor 杜景红张林甘国友严继康易健宏
Owner KUNMING UNIV OF SCI & TECH
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