Method for preparing aluminum oxide micro-sphere

A technology of alumina and microspheres, used in alumina/hydroxide preparation, chemical industry, sustainable manufacturing/processing, etc. The effect of short cycle, simple process and perfect spherical structure

Inactive Publication Date: 2012-11-14
NINGBO UNIVERSITY OF TECHNOLOGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this process is relatively mature, it has brought a series of problems due to its complicated process, such as long production cycle, harsh equipment conditions and expensive production costs. For example, the preparation of high-purity ultra-fine alumina powder generally uses aluminum ammonium sulfate heating solution, ammonium aluminum carbonate pyrolysis and aluminum alkoxide hydrolysis, etc., all have the disadvantages of complicated process, high cost and environmental pollution.

Method used

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  • Method for preparing aluminum oxide micro-sphere
  • Method for preparing aluminum oxide micro-sphere
  • Method for preparing aluminum oxide micro-sphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh the polymer precursor aluminum isopropoxide (Al[OCH(CH 3 ) 2 ] 3 )5g was placed in a 99 alumina ceramic crucible, covered to prevent volatilization of pyrolysis products, heated to 1350°C at 10°C / min in an ordinary resistance heating furnace in air, and kept at 1350°C for 1 hour, then free After cooling to room temperature, the pyrolysis products were collected to obtain single crystal corundum (α-Al 2 o 3 )Microspheres. The typical SEM and TEM pictures of the microspheres are as follows figure 1 and 2 As shown in the figure, the average diameter of the microspheres can be measured to be about 1.2 μm, the structure of the spheres is perfect, the surface is smooth, and the size of the microspheres is uniform.

Embodiment 2

[0030] Weigh the polymer precursor aluminum isopropoxide (Al[OCH(CH 3 ) 2 ] 3 )5g was placed in a 99 alumina ceramic crucible, covered to prevent volatilization of pyrolysis products, heated to 1350°C at 10°C / min in an ordinary resistance heating furnace in air, and kept at 1350°C for 0.5 hours, and then free After cooling to room temperature, the pyrolysis products were collected to obtain single crystal corundum (α-Al 2 o 3 )Microspheres. Typical TEM images of microspheres are shown in image 3 As shown in the figure, the average diameter of the microspheres can be measured to be about 1 μm, the structure of the spheres is perfect, the surface is smooth, and the size of the microspheres is uniform.

Embodiment 3

[0032] Weigh the polymer precursor aluminum isopropoxide (Al[OCH(CH 3 ) 2 ] 3 )5g was placed in a 99 alumina ceramic crucible, covered to prevent the volatilization of pyrolysis products, and heated to 1250°C at 10°C / min in an ordinary resistance heating furnace in air, and kept at 1250°C for 1 hour, and then free After cooling to room temperature, the pyrolysis products were collected to obtain polycrystalline corundum (α-Al 2 o 3 )Microspheres. Typical TEM images of microspheres are shown in Figure 4 As shown in the figure, the average diameter of the microspheres can be measured to be about 0.6 μm, the structure of the spheres is perfect, the surface is smooth, and the size of the microspheres is uniform.

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Abstract

A process for preparing aluminum oxide microsphere concretely includes the following steps: (1) placing raw materials in a crucible, (2) heat decompositing the raw materials placed in the crucible at the temperature between 1150-1350DEG C by a sintering furnace, (3) heat decompositing and insulating for 0.5-1.5 hours and (4) cooling the furnace to room temperature. Compared with the prior art, the utility model has the advantages that perfect spheroidal structure of the aluminum oxide microsphere is formed by employing the decomposition of polymeric compound pre-substance without any protective atmosphere and catalyst, not only the device and the process are simple, but also the production circle is short, the purity of the product is high, simultaneously, the controllability and the repeatability of the process are extremely fine, the single crystalline or polycrystalline aluminum oxide microsphere can be obtained by controlling the heat decomposition temperature, the grain diameter of the microsphere can be adjusted and controlled by controlling the heat preservation time. The high purity aluminum oxide microsphere, especially a single crystalline alumina microsphere, as a grinding medium, will be widely used in electronics industry, fine process of non-metallic minerals, building and sanitary ceramics and hydrodynamic lubrication and the like, which is a widely used energy-saved material.

Description

technical field [0001] The invention relates to a new preparation method of alumina microspheres, belonging to the technical field of material preparation. Background technique [0002] Alumina ceramic balls have excellent characteristics such as high hardness, excellent wear resistance, corrosion resistance, high mechanical strength, and high grinding efficiency. Superfine powder production in coal mines and other industries. Compared with traditional grinding media, alumina ceramic balls have high hardness and large specificity, and the loading capacity of materials to be ground in the same grinding body increases, and the grinding collision probability between balls and materials increases. They are widely used in ball milling, vibration Grinding media in mills such as mills, planetary mills and stirred mills. Due to its high wear resistance, it largely guarantees the stability of the chemical composition of the grinding material. At present, some ceramic enterprises re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/30
CPCY02P20/10
Inventor 杨为佑程晓民王华涛谢志鹏安立楠
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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