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Preparation method of flaky alumina

A flaky alumina and aluminum source technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of complex process, long reaction cycle, difficult control of molten salt uniformity, etc., and achieve simple process, low cost, and equipment simple effect

Active Publication Date: 2015-06-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the reaction cycle is long, the process is complex and the uniformity of adding molten salt is not easy to control

Method used

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  • Preparation method of flaky alumina
  • Preparation method of flaky alumina

Examples

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Effect test

Embodiment 1

[0020] Weigh 0.1 mole of aluminum nitrate, 0.08 mole of urea, and 0.15 mole of sodium fluoride, dissolve various raw materials in distilled water, prepare a solution, and place the solution on a temperature-controllable electric furnace for heating. After the solution undergoes a series of reactions such as volatilization, concentration, and decomposition, the precursor powder is obtained. The precursor powder is reacted for 4 hours at 1300 ° C under the condition of air atmosphere, and the particle size is about 3-6 μm, and the diameter-thickness ratio is about 25-55 flake alumina.

Embodiment 2

[0022] Weigh 0.1 mole of aluminum nitrate, 0.1 mole of urea, 0.1 mole of glucose, and 0.12 mole of sodium fluoride, dissolve various raw materials in distilled water to prepare a solution, and heat the solution on a temperature-controllable electric furnace. After the solution undergoes a series of reactions such as volatilization, concentration, and decomposition, the precursor powder is obtained. The precursor powder is reacted for 3 hours at 1500 ° C under the condition of air atmosphere, and the particle size is about 3-7 μm, and the diameter-thickness ratio is about 25-60 flake alumina.

Embodiment 3

[0024] Weigh 0.1 mole of aluminum nitrate, 0.1 mole of glycine, 0.1 mole of citric acid, and 0.13 mole of sodium fluoride, dissolve various raw materials in distilled water to prepare a solution, and place the solution on a temperature-controllable electric furnace for heating. After the solution undergoes a series of reactions such as volatilization, concentration, and decomposition, the precursor powder is obtained. The precursor powder is reacted at 1650 ° C and air atmosphere for 4 hours, and the particle size is about 3-8 μm, and the diameter-thickness ratio is about 25-65 flake alumina.

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Abstract

The invention discloses a preparation method of a flaky alumina and belongs to the technical field of ceramic powder material preparation. The preparation method mainly comprises the following steps: preparing a solution from such raw materials as an aluminum source, an amine organic matter and an assistant agent in a certain ratio, heating and stirring, and pyrolyzing after the solution is volatilized and concentrated to obtain a precursor powder; and putting the precursor powder in a flowing air atmosphere at 800-1700 DEG C for reacting for 2-4 hours, and finally obtaining the flaky alumina having the particle size of 3-8 microns and the diameter-to-thickness ratio of 25-80. The preparation method of the flaky alumina is simple in equipment, short in process period, high in efficiency and low in cost.

Description

technical field [0001] The invention belongs to the technical field of preparation of ceramic powder materials, and in particular relates to a method for producing flaky alumina. Background technique [0002] Alumina is a common oxide ceramic material with excellent properties such as high hardness, high melting point, oxidation resistance, high temperature resistance, corrosion resistance, high thermal conductivity, and high resistivity. It has abundant reserves and is cheap. As a special alumina and an important powder material, flaky alumina not only has the excellent properties of ordinary alumina but also can be used as a reinforcing phase for ceramics, glass and metal matrix composites due to its special two-dimensional sheet structure. , studies have shown that ceramic matrix composites reinforced with flaky alumina have higher fracture toughness than ceramic matrix composites reinforced with granular alumina, mainly because flaky alumina creates a bridging effect in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
CPCC01F7/02C01P2002/72C01P2004/03C01P2004/20C01P2004/54C01P2004/61
Inventor 秦明礼吴昊阳鲁慧峰陈鹏起贾宝瑞曲选辉
Owner UNIV OF SCI & TECH BEIJING
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