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Method for preparing mullite single crystal nano belt

A single-crystal nanometer and mullite technology, applied in single crystal growth, single crystal growth, chemical instruments and methods, etc., can solve the problems of not reaching nanometer size, irregular whisker shape, difficult to disperse and utilize, etc. Easy-to-control, straight-shaped, surface-integrated effects

Inactive Publication Date: 2005-03-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diameter of the whiskers synthesized by the above method is about 0.5 ~ 3 μm, which cannot reach the nanometer size, and the shape of the whiskers is irregular, and because the synthesis method adopts vapor deposition reaction or is pressed into a sheet under high pressure and then sintered at high temperature , its yield is low, most of which are non-freely dispersed whiskers, which are difficult to disperse and utilize

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: adopt aluminum nitrate, ethyl silicate as basic raw material (Al 2 o 3 with SiO 2 The molar ratio is 3:2), the pH of the solution is adjusted with citric acid, and ammonium tungstate is used as a catalyst. Dissolve aluminum nitrate, ethyl silicate, citric acid, and ammonium tungstate in deionized water (the content of catalyst ammonium tungstate is expressed as Al 2 o 3 / WO 3 The molar ratio is 1:0.05), the pH of the solution is kept at about 3, the solution is heated in a water bath at 60°C for 5 hours to form a transparent sol, and the sol is poured into an alumina crucible and dried at 150°C for 8 hours to form a xerogel. Put the xerogel into a tube furnace for calcination at 1100°C for 6 hours, and take it out after the furnace cools down to room temperature to obtain mullite nanobelts with a width of 300nm, a thickness of 40-200nm and a length of 6μm.

Embodiment 2

[0017] Embodiment 2: adopt aluminum nitrate, ethyl silicate as basic raw material (Al 2 o 3 with SiO 2 The molar ratio is 3:2), the pH of the solution is adjusted with citric acid, and ammonium tungstate is used as a catalyst. Dissolve aluminum nitrate, ethyl silicate, citric acid, ammonium tungstate in deionized water (catalyst ammonium tungstate content, as AlXO 3 / WO 3 The molar ratio is 1:0.1), the pH of the solution is kept at about 3, the solution is heated in a water bath at 60°C for 5 hours to form a transparent sol, and the sol is poured into an alumina crucible and dried at 150°C for 8 hours to form a xerogel. Put the xerogel into a tube furnace for calcination at 1100°C for 6 hours, and take it out after the furnace cools down to room temperature to obtain mullite nanobelts with a width of 250nm and a thickness of 80nm and a length of 6μm.

Embodiment 3

[0018] Embodiment 3: adopt aluminum nitrate, ethyl silicate to be basic raw material (Al 2 o 3 with SiO 2 The molar ratio is 3:2), the pH of the solution is adjusted with citric acid, and ammonium tungstate is used as a catalyst. Dissolve aluminum nitrate, ethyl silicate, citric acid, ammonium tungstate in deionized water (catalyst ammonium tungstate content, with Al 2 o 3 / WO 3 The molar ratio is 1:0.3), the pH of the solution is kept at about 3, the solution is heated in a water bath at 60°C for 5 hours to form a transparent sol, and the sol is poured into an alumina crucible and dried at 150°C for 8 hours to form a xerogel. Put the xerogel into a tube furnace for calcination at 1100°C for 6 hours, and take it out after the furnace cools down to room temperature to obtain mullite nanobelts with a width of 180nm and a thickness of 100nm and a length of 6μm.

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Abstract

The present invention relates to composite material and electronic material, and is the simple process for preparing nanometer monocrystal mullite belt. The material including silicate ester, aluminum salt and citric acid and mixed tungstate or molybdenate catalyst are hydrolyzed to prepare sol containing mullite WO3 or MoO3 component; and the sol is stoved and heated to synthesize nanometer mullite belt. Increasing the content of catalyst properly can increase the thickness of the nanometer mullite belt. The prepared nanometer mullite belt is in monocrytal structure, straight and smooth, and may be used in preparing ceramic base, metal base and polymer base composite reinforced material used widely in optics and electronics. The present invention has the advantages of simple preparation process, easy control, high yield, etc.

Description

technical field [0001] The invention relates to a method for preparing mullite single-crystal nanobelts, and relates to composite materials and electronic materials. technical background [0002] Mullite is Al 2 o 3 -SiO 2 The only stable compound in the binary system, with a very high melting point (1890 ° C), good high temperature creep resistance, high high temperature mechanical strength (strength does not decrease at 1300 ° C), very low thermal expansion coefficient and chemical It is a high-temperature structural ceramic material with excellent performance due to its stable properties and other advantages. In addition, due to the simple synthesis process of mullite materials, low dielectric constant, dielectric loss coefficient and low thermal expansion coefficient, it also has a wide range of application prospects in electronic packaging materials, hard disk substrate materials and radome materials, and is even used It is considered to be a promising new type of i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B29/64
Inventor 曹传宝张冰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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