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Platy-monocrystal alpha-aluminum oxide, and preparation method and application thereof

A flaky single crystal and alumina technology, applied in chemical instruments and methods, alumina/aluminum hydroxide, inorganic chemistry, etc., can solve problems such as high pre-calcination or calcination temperature, complex production process, and difficult tail gas treatment. Achieve the effects of uniform size, simplified process flow and regular shape

Inactive Publication Date: 2016-06-08
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcination of the green body also needs to be carried out in a hydrogen halide atmosphere, which requires high equipment requirements, difficult tail gas treatment, and the entire process is complicated
[0011] Existing flaky α-Al 2 o 3 There are certain problems in the production methods. If some need to add seed crystals, templates, and ethanol activators, some calcinations will produce polluting SO 3 Gas, some are calcined in a corrosive hydrogen halide atmosphere, some need to be pre-calcined or the calcination temperature is too high, the energy consumption is large, and the production process is complicated

Method used

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  • Platy-monocrystal alpha-aluminum oxide, and preparation method and application thereof
  • Platy-monocrystal alpha-aluminum oxide, and preparation method and application thereof
  • Platy-monocrystal alpha-aluminum oxide, and preparation method and application thereof

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preparation example Construction

[0039] A kind of preparation method of flaky single crystal α-alumina of the present invention comprises the following steps:

[0040] a. Using aluminum hydrate or transition phase alumina as raw material, add molten salt, mix and grind; according to the weight ratio, aluminum hydrate or transition phase alumina: molten salt added = 1:1~10;

[0041] b. Add fluoride to the ground material in step a, grind and mix uniformly to obtain a mixed material; wherein, the amount of fluoride added is 1 to 50% of the weight of the generated α-alumina;

[0042] c. Heat the mixed material obtained in step b to 700-1200°C at a rate of 1-20°C / min, keep it warm for 0.5-4h, and cool to room temperature;

[0043] d. Dissolving the material obtained after cooling in step c with hot water at 60-100°C, washing and filtering;

[0044] e. Repeat step d until all the molten salt is removed and dried to obtain flaky single crystal α-alumina.

[0045] The present invention reduces the melt viscosity o...

Embodiment 1

[0061] Weigh 10 g of aluminum monohydrate boehmite (Boehmite, AlOOH) and pseudo boehmite (pseudoBoehmite, AlOOH) 10 g into a mortar, then weigh 10 g of lithium chloride (LiCl) and 0.6 g of NH 4 F, after grinding and mixing evenly, transfer to corundum crucible for calcination. After heating up to 700°C at a rate of 6°C / min, keep the temperature for 4 hours, and then cool down to room temperature with the furnace to obtain the synthesized product. The obtained synthetic product was dissolved in hot water, then filtered and washed with distilled water several times to remove residual molten salt, and finally dried to obtain flaky α-alumina.

Embodiment 2

[0063] Weigh aluminum sulfate crystal salt (Al 2 (SO 4 ) 3 .18H 2 O) 66.6g was dissolved in 200g distilled water, and 41g of 25% ammonia water was added to precipitate under vigorous stirring to obtain aluminum hydroxide gel. After washing with water to remove ammonium sulfate, add 1560 g of sodium sulfate to the obtained aluminum hydroxide gel, then add 1.56 g of LiF, ball mill for 2 hours, mix well, and put it into a corundum crucible for calcination. After heating up to 1200°C at a rate of 300°C / h, keep the temperature for 1 hour, and then cool down to room temperature with the furnace to obtain the synthesized product. The obtained synthetic product was dissolved in hot water, then filtered and washed with distilled water several times to remove residual molten salt, and finally dried to obtain flaky α-alumina.

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Abstract

The invention relates to a platy-monocrystal alpha-aluminum oxide, and a preparation method and application thereof, belonging to the field of inorganic non-metal materials. The method comprises the following steps: a. by using aluminum hydrate or transitional-phase aluminum oxide as a raw material, adding a fused salt, mixing, and grinding; b. adding a fluoride into the ground material in the step a, grinding, and uniformly mixing to obtain a mixture; c. calcining the mixture at 700-1200 DEG C at the heating rate of 1-20 DEG C / minute for 0.5-4 hours, and cooling to room temperature; d. dissolving the cooled material in the step c in 60-100-DEG C hot water, washing and filtering; and e. repeating the step d until the fused salt is completely removed, and drying to obtain the platy-monocrystal alpha-aluminum oxide. The preparation method has the advantages of simple technique and no environment pollution. The prepared alpha-Al2O3 has the advantages of controllable shape, uniform size and favorable dispersity, and can be used in a high-polymer material as a heat-conducting filler for enhancing the heat conductivity coefficient.

Description

technical field [0001] The invention relates to a flaky single crystal α-alumina and its preparation method and application, belonging to the field of inorganic non-metallic materials. Background technique [0002] With the development of industrial production and science and technology, people put forward new requirements for polymer materials, hoping that the materials will have excellent comprehensive properties. For example, heat exchangers used in chemical production and wastewater treatment require that the materials used not only have thermal conductivity, but also require the materials to be resistant to chemical corrosion and high temperature. Due to the rapid development of integration technology and assembly technology in the field of electronics industry, there is an urgent need for thermally conductive and insulating polymer materials with good heat dissipation. As structural components, polymer materials are expected to have good wear resistance and hardness. ...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/44C08K3/22C09D7/12
CPCC01F7/021C01F7/442C01P2002/72C01P2004/02C01P2004/03C01P2004/20C01P2004/61C08K3/22C08K2003/2227C09D7/61
Inventor 张力唐春梅王明清李相东杜鹏飞肖逸菲黄孝龙张玲
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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