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Method for preparing alumina powder for polishing solution

A technology of alumina powder and polishing liquid, which is applied in chemical instruments and methods, alumina/aluminum hydroxide, and other chemical processes, can solve the problem of poor polishing performance and poor dispersion stability of alumina polishing liquid , increase production costs and other issues, to achieve the effect of low cost, good fluidity and energy saving

Inactive Publication Date: 2009-03-25
GUIZHOU BRANCH CHINA ALUMINUM IND
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Problems solved by technology

At present, as the alumina abrasive in the polishing liquid, in the process of preparing the slurry, there are disadvantages such as poor dispersion stability and easy agglomeration, and precipitation often occurs within a few minutes, and the particles become coarser.
In this way, the surface of the matrix is ​​severely scratched during polishing, and the damage layer is deep, which ultimately affects the performance of the product.
[0004] In order to change the performance of alumina, Lu Haicu et al. modified the surface of alumina with acryloyl chloride, which improved the suspension and dispersion performance of alumina to a certain extent, but also increased the production cost. Can not improve the polishing efficiency of alumina polishing liquid
Although the high-purity spherical alumina developed by the Zhengzhou Research Institute of Aluminum Corporation of China can be used as an abrasive in polishing fluid, the cost is too high

Method used

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  • Method for preparing alumina powder for polishing solution
  • Method for preparing alumina powder for polishing solution

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preparation example Construction

[0013] A kind of preparation method of aluminum oxide powder for polishing fluid, the step of its preparation process comprises:

[0014] (1) Using aluminum ammonium sulfate as a raw material, heat and stir with deionized water to dissolve, and configure a concentration of 0.2-0.4M aluminum ammonium sulfate solution;

[0015] (2) Ammonium aluminum sulfate solution is added in the constant temperature reactor, and urea and catalyst are added thereinto, stirred, and the solution reacts to generate precipitation;

[0016] (3) After the reaction is complete, continue to stir for half an hour, age, wash twice, filter, and dry in a drying oven at 80°C for 12 hours to obtain a dry precursor;

[0017] (4) Calcining the spherical alumina precursor in a muffle furnace at 1200-1600° C. for 2-6 hours, and sieving the obtained product to obtain spherical alumina with a uniform particle size and nanostructure.

[0018] In the preparation method of alumina powder for polishing liquid of the...

Embodiment 1

[0023] Put 80 grams of ammonium aluminum sulfate into a clean 1000 ml beaker, add 800 ml of pure water, heat to dissolve, add 100 grams of urea and 0.75 grams of urease, put it into a constant temperature reactor, set the water bath temperature to 60-80 ° C, The beaker was heated in a water bath while the stirring speed was adjusted to 200rpm to stir the solution. After 3 hours, a precipitate appeared, and after aging for 0.5 hour, it was filtered and washed. Calcined at 1200-1600°C for 2-6 hours in a muffle furnace to obtain spherical α-alumina.

Embodiment 2

[0025] Put 120 grams of ammonium aluminum sulfate into a cleaned 1000 ml beaker, add an appropriate amount of pure water to 800 ml, heat to dissolve, add 100 grams of urea and 0.75 grams of urease, put it into a constant temperature reactor, set the water bath temperature to 60- 80°C, heat the beaker in a water bath, and at the same time adjust the stirring speed to 200rpm to stir the solution. After about 3.5 hours, a precipitate appeared, and after aging for 0.5 hour, it was filtered and washed. Calcined at 1200-1600°C for 2-6 hours in a muffle furnace to obtain spherical α-alumina.

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Abstract

The invention discloses a preparation method for polishing liquid used alumina powder, relates to a preparation method for alumina, in particular to a preparation method for polishing liquid and polishing powder used for spherical alumina powder by liquid phase precipitation method. The preparation method is characterized by the preparation process thereof, comprising: adding urea and catalyst in 0.2-0.4M ammonium aluminum sulfate solution for carrying out reaction under the temperature of 60 to 80 DEG C till the precipitation appears; carrying out aging, and then filtering, washing, and drying so as to obtain the precursor of the alumina powder which is calcined for 2 to 6 hours at 1200 to 1600 DEG C; later calcined alumina is obtained; finally, by screening, spherical alumina which has integral crystallization, high purity (the alumina content reaches 99.5 percent), good mobility, and uniform particle diameter, and is suitable to be used for the polishing liquid is obtained.

Description

technical field [0001] The invention discloses a method for preparing alumina powder for polishing liquid, and relates to a method for preparing alumina, in particular to a method for preparing spherical alumina powder for polishing powder for polishing liquid by adopting a liquid phase precipitation method. Background technique [0002] With the rapid development of electronic technology in the direction of high precision, high performance, high integration and high reliability, high requirements are put forward for the machinery manufacturing industry, especially the requirements for processing accuracy and surface quality are becoming higher and higher . In this way, for optical components such as computer hard disks and optical discs, ultra-precision optical lenses and optical windows, as well as advanced glass such as optical communication components and flat-panel displays, the roughness of the surface is a key factor affecting the performance of these high-tech produc...

Claims

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Application Information

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IPC IPC(8): C01F7/02C09K3/14
Inventor 王舟李东红景茂祥
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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