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Preparation method of ultrafine aluminum oxide powder with purity of 5N
The invention relates to the technical field of materials, in particular to a preparation method of ultrafine aluminum oxide powder with a purity of 5N. The method comprises the following steps: (1) adding pseudo-boehmite into straight-chain perfluoroalkyl sulfonyl fluoride, carrying out grinding, adding the ground materials into an alcoholic solution, conducting uniform mixing, adding a water-based dispersant, and conducting uniform mixing to obtain a mixed solution; (2) carrying out centrifugal separation on the mixed solution to obtain a transparent supernatant solution; (3) uniformly mixing the transparent supernatant solution with aluminum alkoxide, and carrying out a hydrolysis reaction for 6-12 hours to obtain a hydrolysis reaction solution; (4) carrying out spray drying and jet milling treatment on the hydrolysis reaction solution to obtain powder; and (5) calcining the powder at a temperature of 800-1100 DEG C for 1-3 hours to prepare the high-purity alpha-aluminum oxide nanocrystal. The method effectively solves the particle size problem and the purity problem in the process of industrial production of alpha-aluminum oxide, the purity of the prepared alpha-aluminum oxide nanocrystal is as high as 99.999% or above, the average grain size of the nanocrystal is smaller than or equal to 30 nm, a maximum grain size is smaller than or equal to 50 nm, dispersity of the nanocrystal is better, and an average particle size is smaller and more uniform.
本发明涉及材料技术领域，尤其涉及一种纯度为5N的氧化铝超细粉末的制备方法。所述方法包括如下步骤：(1)将拟薄水铝石加入直链全氟烷基磺酰氟研磨，随后加入醇溶液中混匀，随后加入水性分散剂混匀，得混合溶液；(2)将混合溶液离心分离得到透明上清溶液；(3)将透明上清溶液与醇铝混合均匀，进行水解反应6～12h制得水解反应液；(4)将水解反应液经喷雾干燥、气流磨处理后得粉体；(5)将粉体在800～1100℃进行煅烧1～3h，制得高纯α‑氧化铝纳米晶。本发明方法有效解决了工业化生产α‑氧化铝过程中粒度问题和纯度问题，制备获得的α‑氧化铝纳米晶纯度高≧99.999％，平均晶粒尺寸≦30nm，最大晶粒尺寸≦50nm，分散性更好、平均粒径更小更均匀。
Preparation method of ultrafine aluminum oxide powder with purity of 5N
The invention relates to the technical field of materials, in particular to a preparation method of ultrafine aluminum oxide powder with a purity of 5N. The method comprises the following steps: (1) adding pseudo-boehmite into straight-chain perfluoroalkyl sulfonyl fluoride, carrying out grinding, adding the ground materials into an alcoholic solution, conducting uniform mixing, adding a water-based dispersant, and conducting uniform mixing to obtain a mixed solution; (2) carrying out centrifugal separation on the mixed solution to obtain a transparent supernatant solution; (3) uniformly mixing the transparent supernatant solution with aluminum alkoxide, and carrying out a hydrolysis reaction for 6-12 hours to obtain a hydrolysis reaction solution; (4) carrying out spray drying and jet milling treatment on the hydrolysis reaction solution to obtain powder; and (5) calcining the powder at a temperature of 800-1100 DEG C for 1-3 hours to prepare the high-purity alpha-aluminum oxide nanocrystal. The method effectively solves the particle size problem and the purity problem in the process of industrial production of alpha-aluminum oxide, the purity of the prepared alpha-aluminum oxide nanocrystal is as high as 99.999% or above, the average grain size of the nanocrystal is smaller than or equal to 30 nm, a maximum grain size is smaller than or equal to 50 nm, dispersity of the nanocrystal is better, and an average particle size is smaller and more uniform.
本发明涉及材料技术领域，尤其涉及一种纯度为5N的氧化铝超细粉末的制备方法。所述方法包括如下步骤：(1)将拟薄水铝石加入直链全氟烷基磺酰氟研磨，随后加入醇溶液中混匀，随后加入水性分散剂混匀，得混合溶液；(2)将混合溶液离心分离得到透明上清溶液；(3)将透明上清溶液与醇铝混合均匀，进行水解反应6～12h制得水解反应液；(4)将水解反应液经喷雾干燥、气流磨处理后得粉体；(5)将粉体在800～1100℃进行煅烧1～3h，制得高纯α‑氧化铝纳米晶。本发明方法有效解决了工业化生产α‑氧化铝过程中粒度问题和纯度问题，制备获得的α‑氧化铝纳米晶纯度高≧99.999％，平均晶粒尺寸≦30nm，最大晶粒尺寸≦50nm，分散性更好、平均粒径更小更均匀。
Preparation method of ultrafine aluminum oxide powder with purity of 5N
一种纯度为5N的氧化铝超细粉末的制备方法
CHEN QI (author) / LI XIANPING (author) / TANG BAOFA (author) / LI GANG (author) / WU YUHAO (author)
2022-01-11
Patent
Electronic Resource
Chinese
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