Method for synthesizing nano alumina powder

A technology of nano-alumina and powder, which is applied in the field of material science, can solve the problems such as difficult to obtain α-Al, and achieve the effects of small particle size, promotion of complete formation, and wide-ranging sources

Inactive Publication Date: 2009-06-17
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above literature reports show that nano-α-Al 2 o 3 The synthesis temperature of powder is generally ar

Method used

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Examples

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Effect test

Embodiment 1

[0016] Weigh 1mol of Al(NO 3 ) 3 9H 2 O was dissolved in a certain amount of deionized water to form a 1 mol / l aluminum nitrate aqueous solution, and 20 grams of PEG400 was added, mixed and stirred evenly. Dissolve 0.004mol of copper nitrate, 0.0001mol of manganese nitrate and 0.05mol of tetrabutyl titanate in 100ml of absolute ethanol, then add 2ml of concentrated nitric acid and 50ml of acetic acid to adjust the pH of the system to about 3, and stir well. The above two solutions were mixed, stirred for 2 hours, and then placed in an oven at 95°C. After 36 hours, a viscous light blue colloid was obtained, and then cooled to obtain a xerogel. Put the dry gel into a high-alumina crucible and calcinate at 1000°C for 2 hours to obtain white nano-alumina powder.

[0017] The transmission electron microscope TEM analysis of the above-mentioned nano-alumina powder shows that the average particle diameter of the powder is about 80nm, and the XRD analysis shows that the powder is a...

Embodiment 2

[0019] Weigh 1mol of C 9 h 21 AlO 3 Dissolve in a certain amount of deionized water to form a 1.5 mol / l aluminum isopropoxide aqueous solution, add 20 grams of oleic acid, mix and stir evenly. Dissolve 0.002mol of copper nitrate, 0.002mol of manganese nitrate and 0.06mol of tetrabutyl titanate in 120ml of absolute ethanol, then add 2ml of concentrated nitric acid and 60ml of acetic acid to adjust the pH of the system to about 3.1, and stir well. The above two solutions were mixed, stirred for 2 hours, and then placed in an oven at 90°C. After 48 hours, a viscous light blue colloid was obtained, and then cooled to obtain a xerogel. Put the dry gel into a high-alumina crucible and calcinate at 1020°C for 2 hours to obtain white nano-alumina powder.

[0020] TEM analysis of the above powder, it can be observed that the average particle diameter of the powder is about 85nm, XRD analysis shows that the powder is high temperature stable α-Al 2 o 3 .

Embodiment 3

[0022] Weigh 1mol of Al(NO 3 ) 3 9H 2 O was dissolved in a certain amount of deionized water to form a 1.8 mol / l aluminum nitrate aqueous solution, and 20 grams of polyvinyl butyral PVB was added, mixed and stirred evenly. Dissolve 0.003mol of copper nitrate, 0.001mol of manganese nitrate and 0.07mol of tetrabutyl titanate in 150ml of absolute ethanol, then add 3ml of concentrated nitric acid and 30ml of acetic acid to adjust the pH of the system to about 2.8, and stir well. The above two solutions were mixed, stirred for 2 hours, and then placed in an oven at 95°C. After 40 hours, a viscous light blue colloid was obtained, and then cooled to obtain a xerogel. Put the dry gel into a high-alumina crucible and calcinate at 980°C for 2 hours to obtain white nano-alumina powder.

[0023] TEM analysis of the above powder, it can be observed that the average particle diameter of the powder is about 80nm, XRD analysis shows that the powder is high temperature stable a-Al 2 o 3 ....

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Abstract

The invention discloses a method for synthesizing alumina nano powder, which comprises: firstly, dissolving aluminum inorganic salt into deionized water, and adding a dispersant for stirring and mixing; secondly, dissolving copper nitrate, manganese nitrate and tetrabutyl titanate into absolute ethyl alcohol, and using concentrated nitric acid and acetic acid to adjust the pH value to be between 2.5 and 4.5; thirdly, uniformly mixing the two solutions, placing the mixture in a water bath or an oven at a temperature of between 80 and 100 DEG C, and obtaining dried gel after a period of time; and fourthly, placing the dried gel into a high-aluminum crucible, and roasting the dried gel at a temperature of between 800 and 1,100 DEG C to obtain the alumina nano powder. Raw materials adopted by the method have wide sources and low cost, and are easily obtained; the preparation technology is simple and controllable; the high-temperature stable alpha-Al2O3 nano powder with fine particle diameter, uniformly distributed particles and single crystal phase can be synthesized at a low temperature; and the prepared alumina nano powder is used for preparing alumina ceramics, and has the advantages of obviously saving energy and reducing consumption because the sintering temperature can be reduced to be less than 1,250 DEG C.

Description

technical field [0001] The invention relates to a method for synthesizing nano-alumina powder, and belongs to the technical field of material science. Background technique [0002] Alumina ceramics has a high melting point, high hardness, and excellent thermal and chemical stability. It is one of the excellent engineering ceramic materials; but its ionic bond is strong, which leads to low diffusion coefficient of its particles and high sintering temperature. , For example, the sintering temperature of 99 alumina is as high as 1750°C. Such a high sintering temperature will promote the rapid growth of grains and the accumulation of residual pores, which will lead to a decrease in the mechanical properties of the material, and at the same time cause the material's air tightness to deteriorate and increase the damage to the kiln refractory brick. Therefore, reducing the sintering temperature of alumina ceramics, shortening the firing cycle, reducing damage to kilns and kiln fur...

Claims

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Application Information

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IPC IPC(8): C01F7/02
CPCY02P20/10
Inventor 王焕平徐时清邓德刚鞠海东周广淼
Owner CHINA JILIANG UNIV
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