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Method for preparing sheet alumina powder

A technology of aluminum oxide powder and aluminum oxide, applied in the direction of aluminum oxide/aluminum hydroxide, can solve the problems of affecting the performance of polishing, not easy to mix evenly, etc., and achieve the effect of good polishing performance

Active Publication Date: 2008-05-21
中铝郑州有色金属研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method has many limitations. The amount of additives added is generally below 3%. Physical mixing is not easy to mix evenly. As a result, only part of the sintering belongs to flaky alumina, which affects the performance of polishing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Mix aluminum hydroxide polyethylene glycol aqueous solution, the polyethylene glycol addition amount is 0.5% of the weight of aluminum hydroxide, after drying the mixed slurry in an oven, calcining at 300 ° C for 240 minutes to obtain a high For the specific surface area of ​​activated alumina, dissolve 2.1g of aluminum fluoride in water to prepare a 100ml aqueous solution, take 100g of calcined alumina, add it to the aluminum fluoride solution, put the mixed solution into a crucible, and place it in a drying oven , dry at 110°C until all the water in the solution evaporates, put activated alumina adsorbed with aluminum fluoride into an alumina ceramic crucible, and calcinate at 1700°C for 6 hours in a muffle furnace to obtain flaky alumina. After crushing, a flaky α-alumina powder material that can be used for polishing is obtained. The particle size of the flaky α-alumina is about 12-20 μm, and the ratio of grain diameter to thickness is about 8-3:1.

Embodiment 2

[0019] Aluminum hydroxide is mixed with polyethylene glycol aqueous solution, and the amount of polyethylene glycol added is 2% of the weight of aluminum hydroxide. After the mixed slurry is dried in an oven, it is calcined at 600 ° C for 120 minutes to obtain a For activated alumina with high specific surface area, dissolve 1.85g of ammonium fluoride in water to prepare 190ml of aqueous solution, take 38g of calcined alumina, add it to the aluminum fluoride solution, and dry it in a drying oven at 130°C until the solution All the water in the solution is evaporated, and the activated alumina adsorbed with aluminum fluoride is put into an alumina ceramic crucible, and calcined at 1200°C for 12 hours in a muffle furnace to obtain flaky alumina, which can be used for Polished flaky α-alumina powder material, the particle size of flaky α-alumina is about 3-5 μm, and the ratio of grain diameter to thickness is about 6-3:1.

Embodiment 3

[0021] Aluminum hydroxide is mixed with polyvinyl alcohol aqueous solution, the amount of polyvinyl alcohol added is 1.5% of the weight of aluminum hydroxide, after the mixed slurry is dried in an oven, aluminum hydroxide is calcined at 1000°C for 30 minutes to obtain A kind of activated alumina with high specific surface area, 5.15% zinc fluoride is dissolved in water to prepare a 172ml aqueous solution, 633g calcined alumina is added to the zinc fluoride solution, and dried in a drying oven at 150°C until All the water in the solution is evaporated, and the activated alumina adsorbed with aluminum fluoride is put into an alumina ceramic crucible, and calcined in a muffle furnace at 1400°C for 6 hours to obtain flaky alumina, which can be used after crushing. For polished flaky α-alumina powder materials, the particle size of flaky α-alumina is about 7-10 μm, and the ratio of grain diameter to thickness is about 7-3:1. .

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Abstract

The invention relates to a preparation method of flaky Alpha-alumina, in particular to the preparation method of flaky Alpha-alumina powder applied to grinding and polishing materials. The method is characterized in that aluminum hydrous oxide and aqueous solutions with organic matters of polyethylene glycol, polyvinyl alcohol, etc., are mixed, with the amount of the organic matters accounting for 0.5 percent to 2 percent of the weight of the aluminum hydrous oxide, and then are calcined for 30-240 minutes under the temperature of 300-1000 DEG C after being dried so as to obtain the alumina which is then mixed with the aqueous solution containing fluoride salts to be calcined for 0.5-12 hours under the temperature of 1200-1700 DEG C after the fluoride is absorbed to the alumina and dried to obtain the flaky Alpha-alumina powder. The flaky Alpha-alumina powder prepared by the invention after being grinded can be used as the flaky Alpha-alumina of the grinding and polishing materials.

Description

technical field [0001] The invention relates to a preparation method of flaky α-alumina, which relates to a preparation method of flaky α-alumina powder for grinding and polishing materials. Background technique [0002] α-alumina (commonly known as corundum) is the most stable phase of all aluminas. It belongs to the A2B3 type compound and has a trigonal crystal system. It has a high melting point (up to 2050 ° C), high hardness (Mohs hardness up to 9), and a compact structure ( The primary crystal true density reaches 4.01g.cm -3 ), high mechanical strength, stable chemical properties, and products with good resistance to acid and alkali. Based on the characteristics of high hardness and good wear resistance of α-alumina, it is widely used to manufacture various grinding materials. [0003] Polishing is a process of processing the surface of materials by using various high-speed rotating grinding heads on the polishing machine. After polishing, the surface of the materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 陈玮李晋峰
Owner 中铝郑州有色金属研究院有限公司
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