Preparation method of nano-alumina fibers

A nano-alumina and fiber technology, which is applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as complex process, poor morphology of alumina fiber, and many influencing factors

Inactive Publication Date: 2015-03-25
广东华科新材料研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its preparation methods mainly include slurry method, pre-polymerization method, impregnation method, anode template method, sol-gel method, etc., but to a certain extent, there are some shortcomings. For example, the anode template method has higher requirements for equipment, and the sol-gel method The method is usually used in combination with electrospinning, the process is complicated and there are many influencing factors
The morphology of alumina fibers prepared by simple hydrothermal method is poor, and most of them can only be obtained in flake, column, and rod shapes, but cannot form fibers, or the fiber length-to-diameter ratio range is large and inhomogeneous

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Measure 0.02molAl (NO 3 ) 3 9H 2 O is placed in a beaker, the beaker is placed in a constant temperature water bath, and 300ml of distilled water is measured with a measuring cylinder and slowly added to the above beaker, stirred at a constant speed, the stirring speed is kept at 600r / min, and the temperature is kept at 80 o C, forming solution A;

[0018] (2) Weigh 0.12mol polyethylene glycol (referred to as: PEG) and pour it into solution A, continue to stir, keep the stirring speed at 3000r / min, and keep the temperature at 80 o C, forming a transparent solution B;

[0019] (3) Weigh 0.15mol of urea and pour it into solution B, continue to stir, keep the stirring speed at 6000r / min, and keep the temperature at 90 o C, forming a transparent solution C;

[0020] (4) Transfer solution C to a polytetrafluoroethylene-lined hydrothermal reactor and keep the temperature at 200 o C, hydrothermal reaction for 28 hours, naturally cooled to room temperature, the resul...

Embodiment 2

[0024] (1) Measure 0.02molAl (NO 3 ) 3 9H 2 O is placed in a beaker, the beaker is placed in a constant temperature water bath, and 400ml of distilled water is measured with a measuring cylinder and slowly added to the above beaker, stirred at a constant speed, the stirring speed is kept at 700r / min, and the temperature is kept at 70 o C, forming solution A;

[0025] (2) Weigh 0.1mol polyethylene glycol (referred to as: PEG) and pour it into solution A, continue to stir, keep the stirring speed at 4000r / min, and keep the temperature at 70 o C, forming a transparent solution B;

[0026] (3) Weigh 0.1mol of urea and pour it into solution B, continue to stir, keep the stirring speed at 5000r / min, and keep the temperature at 85 o C, forming a transparent solution C;

[0027] (4) Transfer solution C to a polytetrafluoroethylene-lined hydrothermal reactor and keep the temperature at 190 o C, hydrothermal reaction for 30 hours, naturally cooled to room temperature, the resulti...

specific Embodiment 3

[0030] (1) Measure 0.02molAl (NO 3 ) 3 9H 2 O is placed in a beaker, the beaker is placed in a constant temperature water bath, and 450ml of distilled water is measured with a measuring cylinder and slowly added to the above beaker, stirred at a constant speed, the stirring speed is kept at 750r / min, and the temperature is kept at 85 o C, forming solution A;

[0031] (2) Weigh 0.14mol polyethylene glycol (referred to as: PEG) and pour it into solution A, continue to stir, keep the stirring speed at 4500r / min, and keep the temperature at 85 o C, forming a transparent solution B;

[0032] (3) Weigh 0.18mol of urea and pour it into solution B, continue to stir, keep the stirring speed at 7500r / min, and keep the temperature at 90 o C, forming a transparent solution C;

[0033] (4) Transfer solution C to a polytetrafluoroethylene-lined hydrothermal reactor and keep the temperature at 240 o C, hydrothermal reaction for 20 hours, naturally cooled to room temperature, the resul...

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PUM

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Abstract

The invention discloses a preparation method of nano-alumina fibers, and particularly relates to a preparation method of nano-alumina fibers. The preparation method comprises the following steps: by adopting a hydrothermal-pyrolysis method, preparing AACH (ammonium aluminum carbonate hydroxide) nanofiber by taking aluminum nitrate nonahydrate as a raw material through adopting a hydrothermal synthesis method, and preparing the nano-alumina fibers by adopting a high-temperature pyrolysis method. The prepared nano-alumina fiber has the advantages of being high in purity, high in length-diameter ratio, uniform in particle size and the like, and the preparation method has the advantages that I. the preparation processes are simple and controllable, and II. the prepared particles are uniform in dimension, and the fibrous alumina is high in length-diameter ratio.

Description

technical field [0001] The present invention relates to a method for preparing nano-alumina fibers, in particular to a method for preparing AACH (ammonium aluminum carbonate) nanofibers by using a hydrothermal-pyrolysis method and using aluminum nitrate nonahydrate as a raw material through a hydrothermal synthesis method. A method for preparing nano-alumina fibers by high-temperature pyrolysis. Background technique [0002] Alumina fiber belongs to high-performance inorganic ceramic fiber, which has excellent characteristics, such as oxidation resistance, high temperature resistance, wear resistance, etc., and also has strong corrosion resistance, good thermal shock resistance, low high frequency loss and electric resistance High strength, low dielectric loss and other characteristics, engineering materials with better overall performance than ordinary materials have been very important in industry, electronics, military and other fields. Its preparation methods mainly inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08C04B35/10C04B35/622B82Y30/00
Inventor 尹荔松李新郭利丹李江王向科张优灵高银留
Owner 广东华科新材料研究院有限公司
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