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Porous alumina preparation method

A technology of porous alumina and alumina powder, which is applied in ceramic products, applications, household appliances, etc., can solve the problems of high impurity content, low material strength, irregular pores, etc., and achieve low impurity content and low impurity content in products , Small and uniform pore size

Active Publication Date: 2019-01-04
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods often have one or more of the following disadvantages: complex process, high product impurity content, low porosity, irregular pores, low material strength, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Batch and mix boric acid powder and alumina powder according to a certain quality: 30% boric acid, 70% alumina;

[0030] 2. Add 7% water of the mass of the raw material to the raw material, further mix it and press it into a pellet under a pelletizing pressure of 20 MPa;

[0031] 3. Dry the pressed pellet wet material, the drying temperature is 100°C, and the drying time is 9 hours;

[0032] 4. Put the dried pellets into the induction furnace for high temperature (1500°C) smelting for 40 minutes;

[0033] 5. After the smelting is finished, cool the product to room temperature in air.

[0034] from figure 1 -XRD and figure 2 -EDS analysis results show that the smelted product is high-purity alumina with almost no other impurities. It can be seen from the scanning electron microscope image that the obtained product is porous, and the pore size is uniformly distributed, and the particle size is about 1 μm.

Embodiment 2

[0036] 1. Batch and mix boric acid powder and alumina powder according to a certain quality: 40% boric acid, 60% alumina;

[0037] 2. Add 10% water of the mass of the raw material to the raw material, further mix it and press it into a pellet under a pelletizing pressure of 20 MPa;

[0038] 3. Dry the pressed pellet wet material, the drying temperature is 100°C, and the drying time is 9 hours;

[0039] 4. Put the dried pellets into the induction furnace for high temperature (1600°C) smelting for 40 minutes;

[0040] 5. After the smelting is finished, cool the product to room temperature in air.

Embodiment 3

[0042] 1. Batch and mix boric acid powder and alumina powder according to a certain quality: 50% boric acid, 50% alumina;

[0043] 2. Add 15% water of the mass of the raw material to the raw material, further mix it and press it into a pellet under a pelletizing pressure of 10 MPa;

[0044] 3. Dry the pressed pellet wet material, the drying temperature is 110°C, and the drying time is 8 hours;

[0045] 4. Put the dried pellets into the induction furnace for high temperature (1800°C) smelting for 40 minutes;

[0046] 5. After the smelting is finished, cool the product to room temperature in air.

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Abstract

The invention belongs to the field of porous material preparation, and discloses a porous alumina preparation method which particularly includes the steps: (1) dispensing and mixing boric acid powderand alumina according to a certain proportion; (2) adding an appropriate amount of water into raw materials and further blending and pressing the raw materials into pellets; (3) placing the pellets into a vacuum drying oven for drying; (4) placing the pellets into an induction furnace for high-temperature smelting; (5) performing air cooling on products to reach room temperature after smelting. Compared with a traditional porous alumina preparation method, the porous alumina preparation method has the advantages that a large number of complicated process steps are omitted, production cost andenergy consumption are remarkably reduced, and generated porous alumina is high in purity and free from other impurities and accordingly has better chemical corrosion resistance.

Description

technical field [0001] The invention relates to a preparation method of porous alumina, which belongs to the field of preparation of porous materials. Background technique [0002] Porous ceramics is a kind of ceramic material that has been fired at high temperature and has a large number of pore structures that communicate with each other and the surface of the material. Porous ceramic materials generally have the following characteristics: good chemical stability, through material selection and process control, can be made into porous materials used in various corrosive environments; have good mechanical strength and rigidity, and can withstand pressure, hydraulic pressure or other stresses Under load, the shape and size of the pores of porous ceramics will not change; the heat resistance is good, and the porous ceramics made of high-temperature-resistant ceramics can filter molten steel and high-temperature gases; they have highly open and interconnected pores; geometric ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/10
CPCC04B35/10C04B38/061
Inventor 邢鹏飞高帅波刘坤李欣王帅
Owner NORTHEASTERN UNIV
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