Method for preparing completely dispersed alpha aluminum oxide nano particles
An alpha alumina and nanoparticle technology, applied in the field of inorganic materials, can solve the problems of large particle size, high phase transition temperature, poor dispersibility, etc., and achieve the effects of small size, low calcination temperature and good dispersibility
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Embodiment 1
[0016] According to the molar ratio of iron ions and aluminum ions at 5:1 and the concentration of aluminum ions at 0.02 mol / L, appropriate amounts of aluminum nitrate and iron nitrate were weighed and dissolved in deionized water. Then titrate the mixed solution to pH 7 with 3 mol / L ammonia water, and continue to stir for 0.5 h. The precipitate was filtered, washed with deionized water and absolute ethanol, and dried at 60°C to obtain the precursor. The precursor was put into a tube furnace, calcined to 620 °C at a rate of 3 °C / min, kept for 2 h, and cooled naturally. The calcined powder was corroded in a reaction kettle with 4 mol / L hydrochloric acid at a temperature of 100°C. Finally, the remaining precipitates in the reactor were washed by centrifugation with 4 mol / L hydrochloric acid and absolute ethanol, respectively, to obtain α-alumina nanoparticles.
[0017] The obtained α-alumina nanoparticles have an average particle size of 14 nm, a particle size distribution of ...
Embodiment 2
[0019] According to the molar ratio of iron ions and aluminum ions at 5:1 and the concentration of aluminum ions at 0.02 mol / L, appropriate amounts of aluminum nitrate and iron nitrate were weighed and dissolved in deionized water. Then titrate the mixed solution to pH 7 with 3 mol / L ammonia water, and continue to stir for 0.5 h. The precipitate was filtered, washed with deionized water and absolute ethanol, and dried at 60°C to obtain the precursor. The precursor was put into a tube furnace, calcined to 660 °C at a rate of 3 °C / min, kept for 2 h, and cooled naturally. The calcined powder was corroded in a reaction kettle with 4 mol / L hydrochloric acid at a temperature of 100°C. Finally, the remaining precipitates in the reactor were washed by centrifugation with 4 mol / L hydrochloric acid and absolute ethanol, respectively, to obtain α-alumina nanoparticles.
[0020] The obtained α-alumina nanoparticles have an average particle size of 23 nm, a particle size distribution of ...
Embodiment 3
[0022] According to the molar ratio of iron ions and aluminum ions at 7:1, and the concentration of aluminum ions at 0.02 mol / L, appropriate amounts of aluminum nitrate and iron nitrate were weighed, and dissolved in deionized water. Then titrate the mixed solution to pH 7 with 3 mol / L ammonia water, and continue to stir for 0.5 h. The precipitate was filtered, washed with deionized water and absolute ethanol, and dried at 60°C to obtain the precursor. The precursor was put into a tube furnace, calcined to 660 °C at a rate of 3 °C / min, kept for 2 h, and cooled naturally. The calcined powder was corroded in a reaction kettle with 4 mol / L hydrochloric acid at a temperature of 100°C. Finally, the remaining precipitates in the reactor were washed by centrifugation with 4 mol / L hydrochloric acid and absolute ethanol, respectively, to obtain α-alumina nanoparticles.
[0023] The obtained α-alumina nanoparticles have an average particle size of 25 nm, a particle size distribution o...
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