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Method for preparing sheet alumina powder

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

Active Publication Date: 2010-03-17
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] The aqueous solution of aluminum hydroxide and polyethylene glycol was mixed, and the amount of polyethylene glycol added was 0.5% of the weight of aluminum hydroxide. After the mixed slurry was dried in an oven, it was calcined at 300°C for 240 minutes to obtain a high For activated alumina with specific surface area, 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 in a crucible, and place it in a dry box Dry at 110°C until all the water in the solution evaporates. Load the activated alumina with aluminum fluoride into an alumina ceramic crucible, and calcinate in a muffle furnace at 1700°C for 6 hours to obtain flake alumina. After pulverization, a flake-shaped α-alumina powder material that can be used for polishing is obtained. The particle size of the flake-shaped α-alumina is about 12-20 μm, and the ratio of crystal grain diameter to thick...

Embodiment 2

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

Embodiment 3

[0021] The aluminum hydroxide is mixed with the aqueous solution of polyvinyl alcohol, the added amount of polyvinyl alcohol is 1.5% of the weight of aluminum hydroxide, the mixed slurry is dried in an oven, and the aluminum hydroxide is calcined at 1000°C for 30 minutes to obtain A kind of activated alumina with high specific surface area. Dissolve 5.15 zinc fluoride in water to prepare a 172ml aqueous solution. Take 633g of calcined alumina and add it to the zinc fluoride solution. Dry it in a drying oven at 150°C until All the water in the solution evaporates, the activated alumina with aluminum fluoride is put into an alumina ceramic crucible, and it is calcined in a muffle furnace at 1400°C for 6 hours to obtain flake alumina. After crushing, it can be used. For the polished flaky α-alumina powder material, the particle size of the flaky α-alumina is about 7-10 μm, and the ratio of crystal 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 for0.5 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] A preparation method of flake alpha-alumina relates to a preparation method of flake alpha-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. It has a trigonal crystal system. It has a high melting point (up to 2050°C), a high hardness (Mohs hardness of 9), and a compact structure ( The true density of a crystal reaches 4.01g.cm -3 ), high mechanical strength, stable chemical properties, and products have good resistance to acids and alkalis. 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 that uses various high-speed rotating grinding heads on polishing machines to process the surface of materials. After polishing, the surface of the material is smooth and bright, and has a strong...

Claims

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Application Information

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Patent Type & Authority Patents(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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