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Preparation of nano aluminum oxide composite powder

A technology of nano-alumina and composite powder, which is applied in the field of nano-alumina composite powder manufacturing, which can solve the problems existing between other powder particles, the inability of nano-powder to effectively function, and the difficulty of nano-powder. Improvement of surface flatness and density, shortening of firing time, and reduction of kiln temperature

Inactive Publication Date: 2009-07-22
苏州华微特粉体技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the nano-powder itself is easy to agglomerate. For the conventional roller milling mixing method, it is difficult for the nano-powder to form a uniform mixture with other powders. Usually, the nano-powder itself clings to form agglomerates and exists among other powder particles. As a result, the nano powder cannot effectively play its role

Method used

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Embodiment Construction

[0007] The present invention will be described in further detail below in conjunction with embodiment.

[0008] The specific process steps of the present invention to prepare nano-alumina composite powder are as follows:

[0009] 1. Production of nano-alumina powder: After heating and sublimating anhydrous aluminum trichloride, the gaseous aluminum trichloride and water vapor are respectively heated to the reaction temperature and sprayed into the reactor to generate alumina powder at the same time. The process is: 2AlCl 3 (g)+3H 2 O(g)=Al 2 o 3 (s) + 6HCl (g).

[0010] 2. In order to make the reaction of aluminum trichloride complete, the volume flow rate of water vapor can be controlled at 2 to 8 times of that of aluminum trichloride.

[0011] 3. In order to obtain alumina products with different crystal structures, the reaction temperature is adjusted within the range of 500 to 1200°C.

[0012] 4. In order to obtain products with different grain sizes, the volume conc...

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Abstract

The invention provides a nano alumina composite powder producing method which is characterized in that the invention is a composite powder producing method for carrying out compositing by spraying one kind or a plurality of kinds of powder during the process of synthesizing the nano alumina powder by a CVD method when the nano alumina powder is still under a suspension state. The method can realize that the nano alumina powder is uniformly dispersed and coated on the surfaces of other powder grains.

Description

technical field [0001] The invention relates to a method for manufacturing a nano-alumina composite powder, which is a process for uniformly dispersing the nano-alumina superfine powder into other powder media and coating the surface of the other powder. Background technique [0002] With the continuous development of nanotechnology, the application and development of nanopowder in the field of ceramics is changing with each passing day. Studies have shown that the impact of nano-powders on ceramic materials is multifaceted, not only in the toughening and strengthening of ceramics, that is, the impact on ceramic microstructure, structure and performance, but also in the sintering process of ceramics. big impact. The superiority of nano-alumina ceramics sintering is mainly manifested in the microcosm of sharp increase in powder surface energy, increased diffusion, shortened diffusion path, reduced sintering activation energy, accelerated sintering rate, hindered dislocation ...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
Inventor 胡晞
Owner 苏州华微特粉体技术有限公司