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Preparing process fibrous nano alumina powder

A technology of nano-alumina and nano-powder, which is applied in the production of fibrous nano-alumina powder by liquid-phase precipitation, and in the field of preparation of fibrous nano-alumina powder, which can solve the problem of unsuitable industrial production and energy consumption and high cost issues, to achieve the effect of comparative energy consumption and cost, low energy consumption and cost, and mild production conditions

Inactive Publication Date: 2007-06-27
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods often require the use of high temperature and high pressure or gas-solid reaction process, so the energy consumption and cost are high, and it is not suitable for industrial production

Method used

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  • Preparing process fibrous nano alumina powder

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1: Under the magnetic stirring of 1300r / min, the aluminum ammonium sulfate A solution containing 8wt% PEG600 with a concentration of 0.4mol / L was added at a rate of 300 drops / min into an equal volume of 9wt% Span 80 with a concentration of 0.4 mol / L ammonium bicarbonate B solution (pH 9.3), after the titration is completed, continue to stir for 0.5 h; centrifuge, wash 3 times with secondary water to obtain a precipitate. Add the obtained precipitate into 80ml of n-butanol to disperse, reflux for 2 hours, and distill to remove the n-butanol-water azeotrope at 93°C. When the temperature of the fraction rises to the boiling point of n-butanol at 117°C, stop the distillation. After continuing to reflux for 2 h, n-butanol was recovered by distillation under reduced pressure to obtain a loose powder.

[0028] Calcined at 900°C for 2 hours to obtain γ-Al 2 o 3 The product, its particle morphology is shown in Figure 1, the particle size and shape uniformity is good, t...

Embodiment 2

[0029] Example 2: Under the magnetic stirring of 1000r / min, the aluminum ammonium sulfate A solution containing 5wt% PEG600 with a concentration of 0.3mol / L was added into an equal volume of 0.3mol / L containing 1wt% Span 80 at a rate of 250 drops / min. mol / L ammonium bicarbonate B solution (pH 9.8), after the titration is completed, continue to stir for 0.5 h; centrifuge, wash 3 times with secondary water to obtain a precipitate. Add the obtained precipitate into 80ml of n-butanol to disperse, reflux for 2 hours, and distill to remove the n-butanol-water azeotrope at 93°C. When the temperature of the fraction rises to the boiling point of n-butanol at 117°C, stop the distillation. After continuing to reflux for 2 h, n-butanol was recovered by distillation under reduced pressure to obtain a loose powder.

[0030] Calcined at 850°C for 2 hours to obtain γ-Al 2 o 3 The product, its particle morphology is shown in Figure 3, the particle size and shape uniformity is good, the mono...

Embodiment 3

[0031]Embodiment 3: under the magnetic stirring of 1300r / min, the aluminum ammonium sulfate A solution that the concentration that contains 5wt% PEG600 is 0.3mol / L is added the concentration that contains 2wt% Span 80 with the speed of 300 drops / min 2 times of volume is In 0.3 mol / L ammonium bicarbonate B solution (pH 9.8), after the titration is completed, continue to stir for 0.5 h; centrifuge, wash 3 times with secondary water to obtain a precipitate. Add the obtained precipitate into 80ml of n-butanol to disperse, reflux for 2 hours, and distill to remove the n-butanol-water azeotrope at 93°C. When the temperature of the fraction rises to the boiling point of n-butanol at 117°C, stop the distillation. After continuing to reflux for 2 h, n-butanol was recovered by distillation under reduced pressure to obtain a loose powder.

[0032] Calcined at 880°C for 2.5 hours to obtain γ-Al 2 o 3 The product, its particle morphology is shown in Figure 5, there are plates in the part...

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Abstract

The process of preparing fibrous nanometer alumina powder includes the following steps: dissolving ammonium aluminum sulfate and ammonium bicarbonate separately in double distilled water to compound solutions; adding polyglycol into the ammonium aluminum sulfate solution to prepare solution A of ammonium aluminum sulfate containing polyglycol, adding Span-80 into the ammonium bicarbonate solution to prepare solution B of ammonium bicarbonate containing Span-80 and regulating pH value, adding the solution A into the solution B via stirring, centrifuging, washing, azeotropic distillation to dewatering, and calcining at 850-900 deg.c or 1100-1150 deg.c to nanometer fibrous gamma-Al2O3 powder or nanometer fibrous alpha-Al2O3 powder. The process is simple and low in cost, and the prepared fibrous product with high specific surface area may be used in ceramic material, nanometer composite material, etc in different fields.

Description

technical field [0001] The invention relates to a preparation method of fibrous nano-alumina powder, in particular to a preparation method for producing fibrous nano-alumina powder by using a liquid phase precipitation method, and belongs to the field of inorganic nano-materials. Background technique [0002] Alumina fiber is a high-performance inorganic fiber, which not only has the advantages of high strength, high modulus, low thermal conductivity, low thermal expansion coefficient, good heat resistance and high temperature oxidation resistance. Moreover, the surface activity is good, and it is easy to compound with resin, metal, and ceramic matrix to form a composite material with many beneficial properties and a wide range of applications. For example, alumina nanofibers are ideal structural reinforcements for various nanocomposites, and are strong heat-resistant materials at high temperatures. It is very popular in aerospace, military industry and high-tech fields. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/30C01F7/34B82B3/00
Inventor 彭天右刘迅吴志国
Owner WUHAN UNIV
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