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
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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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