Method for wrapping silicon dioxide particle surface with aluminum oxide

A technology of aluminum oxide and silicon dioxide, which is applied in the field of composite materials, can solve the problems of difficult phase formation and uneven contact of silicon dioxide, and achieve the goal of being suitable for large-scale industrial production, improving the contact area, and reducing the difficulty of phase formation Effect

Inactive Publication Date: 2017-08-11
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional process directly mixes the powder particles of silicon dioxide and aluminum oxide, the contact between the two powder particles is not uniform, and the phase formation of silicon dioxide is difficult

Method used

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  • Method for wrapping silicon dioxide particle surface with aluminum oxide
  • Method for wrapping silicon dioxide particle surface with aluminum oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Dissolve 2.21g of ethylenediaminetetraacetic acid in 20g of absolute ethanol, heat on a heating stirrer and keep the temperature at 100°C, add 1.18g of dibutylamine dropwise under stirring and keep stirring for 4 hours, keeping the above temperature , add 1.87g of tert-butoxyaluminum and continue to stir for 4 hours, after fully reacting, an aluminum-containing organic ion solution is obtained. Add silicon dioxide powder with a particle size of 50 μm into the aluminum-containing organic ion solution, stir at 100°C until it volatilizes and dries to form a honey-like gel, transfer the gel to a crucible and heat it in a muffle furnace at 600°C Calcined at high temperature for 5 hours to obtain silicon dioxide powder coated with aluminum oxide.

[0027] The structure of the prepared silica powder coated with Al2O3 is as follows: figure 1 As shown, wherein the aluminum oxide coating layer 2 is coated on the surface of the silica particles 1, and the thickness of the aluminu...

Embodiment 2

[0029] Dissolve 4.42g of ethylenediaminetetraacetic acid in 20g of absolute ethanol, heat on a heating stirrer and keep the temperature at 100°C, add 2.36g of dibutylamine dropwise under stirring and keep stirring for 4 hours, keeping the above temperature , add 3.74g of tert-butoxyaluminum and continue to stir for 4 hours, after fully reacting, an aluminum-containing organic ion solution is obtained. Add silicon dioxide powder with a particle size of 50 μm into the aluminum-containing organic ion solution, stir at 100°C until it volatilizes and dries to form a honey-like gel, transfer the gel to a crucible and heat it in a muffle furnace at 600°C Calcined at high temperature for 5 hours to obtain silicon dioxide powder coated with aluminum oxide.

[0030] The structure of the prepared silica powder coated with Al2O3 is as follows: figure 1 As shown, wherein the aluminum oxide coating layer 2 is coated on the surface of the silica particle 1, and the thickness of the aluminum...

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Abstract

The invention discloses a method for coating aluminum oxide on the surface of silicon dioxide particles. A wet chemical method is used to add tert-butoxyaluminum to a solution of ethylenediaminetetraacetic acid and dibutylamine under heating and stirring conditions. , to obtain an organic ion solution containing aluminum, and then add silica powder to the organic ion solution, heat and stir to dry to obtain a gel, and then put the gel into a muffle furnace for roasting, and the silica particles can be The surface is covered with a layer of aluminum oxide. The composite material of the present invention is in granular form, the particle size is determined by the particle size of the initial silicon dioxide, and the thickness of the aluminum oxide coating layer can be adjusted according to requirements. The aluminum oxide-coated silicon dioxide composite material of the invention is very suitable for preparing silicon dioxide structural materials with high tridymite phase and high cristobalite phase content, has simple preparation and easy process control, and is very suitable for large-scale production.

Description

technical field [0001] The invention relates to composite materials, in particular to a method for coating aluminum oxide on the surface of silicon dioxide particles. Background technique [0002] Silicon dioxide, also known as silica, chemical formula SiO 2 , There are two forms of amorphous silica and crystalline silica. Representative of amorphous silica is glass. Crystalline silica is divided into three types: quartz, tridymite and cristobalite due to different crystal structures. [0003] Pure quartz is a colorless crystal, and the large and transparent prismatic quartz is called crystal. If the crystals containing trace impurities have different colors, there are amethyst, tea crystal and so on. Ordinary sand is fine quartz crystal, there are yellow sand (more iron impurities) and white sand (less impurities, more pure). [0004] Tridymite (Tridymite) is SiO 2 A stable phase between 870 and 1470°C. Transforms to cristobalite at higher temperatures; transforms to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
CPCC01B33/12
Inventor 颜丙功王霏张际亮顾永华江开勇
Owner HUAQIAO UNIVERSITY
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