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Mixed microwave sintering method of alpha-Al203 powder

A hybrid microwave and sintering technology, applied in the preparation of alumina/hydroxide, can solve the problems of environmental pollution, long powder sintering time, and high energy consumption, improve purity, and achieve grain refinement and uniformity. energy saving effect

Inactive Publication Date: 2014-02-12
ZHENGZHOU UNIVERSITY OF AERONAUTICS
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of α-Al in the current prior art 2 o 3 Powder sintering time is long, energy consumption is large, environmental pollution is serious and other problems, the purpose of the present invention is to provide a kind of α-Al 2 o 3 Hybrid microwave sintering method of powder

Method used

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  • Mixed microwave sintering method of alpha-Al203 powder
  • Mixed microwave sintering method of alpha-Al203 powder
  • Mixed microwave sintering method of alpha-Al203 powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as Figure 1~4 The auxiliary heating and heat preservation device shown: includes inner and outer double-layer insulation layers 2, 3, the inner and outer double-layer insulation layers 2, 3 are nested and formed by inner and outer cylinders, and the inner layer insulation layer 2 is lower than the outer layer insulation layer 3, Auxiliary heating bodies 4 are evenly distributed along the circumferential direction between the inner and outer double-layer insulation layers 2 and 3, and the top of the inner and outer double-layer insulation layers 2 and 3 is provided with a cover plate 1 matching its shape, and an infrared temperature detector is provided on the cover plate 1 Hole 5, wherein the auxiliary heating body 4 is a SiC heating rod, the distance between the SiC heating rod and the inner and outer double-layer insulation layers 2 and 3 is 1~3cm, and the distance between the inner layer insulation layer 2 and the center of the device (where the sample is placed...

Embodiment 2

[0040] Basically the same as Example 1, the difference is that the raw material is ammonium aluminum sulfate dodecahydrate powder, the sample mass is 50g, when the reflected power is basically stable, the heating rate is maintained at 15±3°C / min, and the temperature is raised to a sintering temperature of 1200°C at a uniform speed. ℃, the holding time is 15min, and the microwave input power is controlled to cool down to room temperature at a constant speed of 20±3℃ / min. The whole sintering process lasted about 130min.

[0041] The resulting α-Al 2 o 3 The particle size distribution of the powder is uniform, about 0.2 μm, high purity, loose particle surface, soft agglomeration, and easy grinding. Its X-ray diffraction pattern is shown in Figure 7 . α-Al 2 o 3 The scanning electron microscope photograph of the cross-section of the powder is as follows: Figure 10 As can be seen from the figure, α-Al 2 o 3 The particle size of the powder is uniform and spherical, and th...

Embodiment 3

[0043] Basically the same as Example 1, the difference is that the raw material is aluminum oxide monohydrate powder, and the sample mass is 100g. When the reflected power is basically stable, the heating rate is maintained at 30±3°C / min, and the temperature is raised to a sintering temperature of 1000°C at a uniform speed. The holding time is 20 minutes, and the microwave input power is controlled to cool to room temperature at a constant speed of 6±3°C / min. The whole sintering process lasted about 250min.

[0044] The resulting α-Al 2 o 3 The particle size distribution of the powder is uniform, about 0.2μm, high purity, fine and uniform crystal grains, and easy to disperse. Its X-ray diffraction pattern is shown in Figure 8 . α-Al 2 o 3 The scanning electron microscope photograph of the cross-section of the powder is as follows: Figure 11 As can be seen from the figure, α-Al 2 o 3 The grain size of the powder is uniform and spherical, and the grain boundaries are ...

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Abstract

The invention belongs to the field of inorganic nonmetallic material preparation process technology, and discloses a mixed microwave sintering method of alpha-AL203 powder. The method comprises the following steps: putting precursor powder in an auxiliary heating insulation device, putting both the auxiliary heating insulation device and the precursor powder in a microwave cavity for sintering, firstly, turning on the microwave source, adjusting the microwave input power, and slowly heating up at an average speed of 6-30 DEG C / min; after dewatering, continuously adjusting the microwave input power, rapidly heating up at a speed of 20-100 DEG C / min, and meanwhile monitoring the reflection power; and after the reflection power is stable, maintaining the heating rate at 10-30 DEG C / min, heating up to a sintering temperature of 1000-1500 DEG C at a constant speed, keeping at the temperature for 2-20min, controlling the microwave input power, and rapidly cooling to room temperature at a constant speed of 6-30 DEG C / min to obtain alpha-AL203 powder product. The method of the invention combines traditional sintering and microwave sintering according to the wave adsorption property of oxides, so as to realize rapid sintering of alpha-AL203 powder. The method is low in cost, pollution-free, convenient and rapid, and is suitable for large-scale production of alpha-AL203 powder.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic non-metallic materials, in particular to an α-Al 2 o 3 Powder hybrid microwave sintering method. Background technique [0002] α-Al 2 o 3 Appearance is white powder or fine sand, good fluidity, stable performance, difficult to dissolve in acid-base solution, is an inorganic non-metallic material with wide application, excellent performance and economical price, widely used in various fields of national economy . Especially in recent years, with the rapid rise of high-tech industry, α-Al 2 o 3 The application of powder has also been rapidly expanded. [0003] α-Al 2 o 3 The real market of powder is very considerable, and with the continuous expansion of its application field, the continuous derivation, serialization and extension of its products, α-Al 2 o 3 The market prospect of powder is more promising. Therefore, α-Al 2 o 3 The improvement of powder preparation tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/30C01F7/32
Inventor 张锐范冰冰张昕王海龙任向前王晨阳骈小璇陈浩
Owner ZHENGZHOU UNIVERSITY OF AERONAUTICS
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