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Preparation method of alumina oxide matrix porous ceramic material

A technology of alumina ceramic powder and alumina, which is applied in the field of ceramic materials, can solve problems such as difficult to obtain pure alumina porous ceramic materials, and achieve the effects of saving the use of sintering aids, saving costs, and increasing the contact area

Inactive Publication Date: 2010-08-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These traditional porous ceramic preparation methods not only require a large amount of sintering aids, but also increase the sintering temperature, making it difficult to obtain high-purity alumina porous ceramic materials

Method used

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  • Preparation method of alumina oxide matrix porous ceramic material
  • Preparation method of alumina oxide matrix porous ceramic material
  • Preparation method of alumina oxide matrix porous ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) uniformly mixing the silicone resin and the alumina powder with a particle size of less than 20 μm in a weight ratio of 4:1;

[0029] (2) Molded by the method of stepped heating molding process system, the axial pressure is 60Mpa, the temperature system is 120°C, 0.5h→150°C, 1h→180°C, 1h→200°C, 0.5h;

[0030] (3) Sintering under normal pressure at 1200° C. under the protection of nitrogen atmosphere, the heating rate is 120° C. / hour, and the temperature is kept for 2 hours. The porosity can be 25%, the bending strength is 57MPa, and the density is 2.03g / cm 3 alumina-based porous ceramic materials.

[0031] Analytical tests show that (see figure 2 ): The main phases of the product are α-alumina and γ-alumina, and the main phases of the raw materials are still maintained without phase transition. However, it can be clearly seen that the silicone resin forms a Si-C-O amorphous substance during the cracking process, which weakens the diffraction peak of alumina. Th...

Embodiment 2

[0034] (1) uniformly mixing the silicone resin and the alumina powder with a particle size of less than 20 μm in a weight ratio of 3.3:1;

[0035] (2) Molded by the method of stepped heating molding process system, axial pressure 40Mpa, temperature system 120°C, 1h→150°C, 1h→180°C, 1h→200°C, 1h;

[0036] (3) Cracking is carried out at 1200° C. under the protection of nitrogen atmosphere, the heating rate is 120° C. / hour, and the temperature is kept for 2 hours. The porosity is 31%, the bending strength is 43MPa, and the density is 2.01g / cm 3 alumina-based porous ceramic materials.

Embodiment 3

[0038] (1) uniformly mixing the silicone resin and the alumina powder with a particle size of less than 10 μm in a weight ratio of 3.6:1;

[0039] (2) Molded by the method of stepped heating molding process system, axial pressure 30Mpa, temperature system 120°C, 0.5h→150°C, 1h→180°C, 1h→200°C, 1h;

[0040] (3) Cracking was carried out at 1100° C. under the protection of nitrogen atmosphere, the heating rate was 140° C. / hour, and the temperature was kept for 2 hours. The porosity can be 33%, the bending strength is 36MPa, and the density is 1.98g / cm 3 alumina-based porous ceramic materials.

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Abstract

The invention provides a preparation method of an alumina oxide matrix porous ceramic material, which specifically comprises the following steps: uniformly mixing silicone with alumina oxide ceramic powder according to the volume ratio of 1:1-4:1; treating the mixed powder at a temperature of 100-150 DEG C for 3 to 24 hours to evaporate a solvent, and removing free water of the silicone to obtain the alumina oxide ceramic coating powder; after grinding and screening, forming the alumina oxide ceramic coating powder by adopting a step heating molding process system to obtain biscuit samples; and pyrolyzing the biscuit at a temperature of 800-1200 DEG C under the protection of inert atmosphere, controlling the reaction rate between 100 DEG C / hour and 300 DEG C / hour, the holding time being 1-10 hours, and obtaining the alumina oxide matrix porous ceramic material. The invention has low pyrolysis temperature, good repeatability and low cost, and the prepared alumina oxide matrix porous ceramic material has uniform pore distribution, small pore size, higher porosity, higher mechanical strength and other excellent performances.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a preparation method of an alumina-based porous ceramic material with an organic silicon resin as a binder. Background technique [0002] Porous ceramic is a new type of ceramic material that is fired at high temperature and forms a large number of pores in the material body during the molding and sintering process. It can be used as biological material, catalyst carrier material, filter material, heat exchanger material, etc. [0003] Alumina ceramics have become the material of choice for porous ceramics due to their low manufacturing cost. In addition to the characteristics of wide sources, relatively low price and mature preparation technology, alumina also has the following excellent characteristics: (1) high temperature resistance; (2) good chemical stability; (3) excellent wear resistance; (4) Corrosion; (5) High mechanical strength; (6) Low thermal conductivity; (7) High...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/10C04B35/622
Inventor 沈强郑劲熊远禄陈斐王传彬张联盟
Owner WUHAN UNIV OF TECH
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