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Method for preparing high strength aluminum titanate ceramic

An aluminum titanate, high-strength technology, applied in the field of aluminum titanate ceramics, can solve the problems of stress concentration, strength reduction, material micro-cracks, etc., achieve superior thermal shock resistance and thermal shock resistance, and inhibit the decomposition of aluminum titanate. , the effect of improving the sintering performance

Inactive Publication Date: 2009-06-17
王碧君
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the aluminum titanate material has two fatal weaknesses: one is that the anisotropy of thermal expansion of aluminum titanate causes a large number of microcracks inside the material, reducing its strength.
The second is that in the temperature range of 750°C-1280°C, aluminum titanate is easily decomposed into alumina and titanium dioxide, resulting in internal stress concentration of the material and increasing the thermal expansion rate of the material
It can be seen that the use of pre-burning process is also one of the effective methods to improve the performance of aluminum titanate, but its process is complicated and the cost of materials is high, so it is not suitable for popularization and application.
And the following problems must be paid attention to during the reaction process of aluminum titanate: the volume effect (expansion is about 10%) and the appearance of microcracks during the reaction process, which makes aluminum titanate difficult to sinter
This kind of sintering often causes the sample to crack due to the excessive volume effect and the stress generated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of preparation method step of high-strength aluminum titanate ceramics is:

[0025] (1) Al 2 o 3 、TiO 2 , SiO 2 Dosing with MgO, Al 2 o 3 、TiO 2 , SiO 2 The weight percentages of MgO and MgO are respectively: 35,28,35,2;

[0026] (2) Wet grind the mixture for 10 hours, the weight ratio of material, ball and water is 1:2:1, and the voltage of the instrument is 120V;

[0027] (3) Take out the slurry and wash it with water and put it into an oven at a constant temperature of 128°C and dry it to a constant weight;

[0028] (4) Grind the dried material in a mortar and granulate (because the material contains kaolin and has a high water content, so no binder can be added during granulation), and then pass the powder through 40 mesh screen;

[0029] (5) The undersize is placed in a metal mould, and it is compressed into a tablet with a tablet press, and the pressure is 7Mpa;

[0030] (6) Use a vernier caliper to test the diameter and thickness of the sample, ...

Embodiment 2

[0033] A kind of preparation method step of high-strength aluminum titanate ceramics is:

[0034] (1) Al 2 o 3 、TiO 2 , SiO 2 Dosing with MgO, Al 2 o 3 、TiO 2 , SiO 2 The weight percentages of MgO and MgO are respectively: 39,18,40,3;

[0035] (2) Wet grind the mixture for 14 hours, the weight ratio of material, ball and water is 1:2:1, and the voltage of the instrument is 120V;

[0036] (3) Take out the slurry and wash it with water and put it into an oven at a constant temperature of 128°C and dry it to a constant weight;

[0037] (4) Grinding the dried material in a mortar, granulating, and then passing the powder through a 40-mesh sieve;

[0038] (5) The undersize is placed in a metal mold, and it is pressed into a tablet with a tablet press, and the pressure is 9Mpa;

[0039] (6) Use a vernier caliper to test the diameter and thickness of the sample, put the pressed sample in the sagger, spread the pad powder and burn it. The pad powder is alumina powder calcine...

Embodiment 3

[0042] A kind of preparation method step of high-strength aluminum titanate ceramics is:

[0043] (1) Al 2 o 3 、TiO 2 , SiO 2 Dosing with MgO, Al 2 o 3 、TiO 2 , SiO 2 The weight percentages of MgO and MgO are respectively: 36.6, 25.1, 36, 2.3;

[0044] (2) Wet grind the mixture for 12 hours, the weight ratio of material, ball and water is 1:2:1, and the voltage of the instrument is 120V;

[0045] (3) Take out the slurry and wash it with water and put it into an oven at a constant temperature of 128°C and dry it to a constant weight;

[0046] (4) Grinding the dried material in a mortar, granulating, and then passing the powder through a 40-mesh sieve;

[0047] (5) The undersize is placed in a metal mold, and it is compressed into a tablet with a tablet press, and the pressure is 8Mpa;

[0048] (6) Test the diameter and thickness of the sample with a vernier caliper, put the pressed test piece in the sagger, spread the pad powder and burn it. The pad powder is alumina ...

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PUM

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Abstract

The invention belongs to a method for preparing high-strength aluminum titanate ceramic, which comprises the steps: (1) material distribution; (2) ball milling; (3) drying; (4) granulation; (5) molding by semidry pressing; (6) measurement and sintering; and (7) testing. The method accelerates the sintering by adding an appropriate additive, greatly improves the sintering property of aluminum titanate, inhibits the decomposition of the aluminum titanate, and ensures that the aluminum titanate has the characteristics of excellent thermal shock resistance and thermal impact resistance and so on, thereby ensuring that the aluminum titanate ceramic is practically applied and can be widely applied to industrial production.

Description

technical field [0001] The invention belongs to the field of aluminum titanate ceramics, in particular to a preparation method of high-strength aluminum titanate ceramics. Background technique [0002] With the development of industry, the demand for materials with high temperature resistance and thermal shock resistance is becoming more and more urgent. Thermal shock resistance mainly depends on the thermal expansion coefficient, mechanical properties, Young's modulus and thermal conductivity of the material. Because a material with a coefficient of thermal expansion close to zero experiences the least thermal stress inside it when the temperature changes. [0003] As a new type of ceramic material, aluminum titanate ceramics has the characteristics of close to zero thermal expansion coefficient, low thermal conductivity, high melting point, thermal shock resistance and thermal shock resistance. One of the best. However, the aluminum titanate material has two fatal weakn...

Claims

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Application Information

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IPC IPC(8): C04B35/478C04B35/622
Inventor 王碧君白宇杨蔚白乃丰任晖
Owner 王碧君
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