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Preparation method for polycrystalline alumina fiber

A polycrystalline alumina fiber technology, applied in the field of polycrystalline alumina fiber preparation, can solve the problems of short alumina fiber, cumbersome operation process, and incomplete surface, and achieve smooth surface, simple operation process, and simple equipment Effect

Inactive Publication Date: 2014-04-16
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent 201210293005.9 prepared hollow alumina fibers by electrospinning. It can also be seen from the picture that the prepared alumina fibers are short, the surface is not complete, the fiber strength is poor, and the operation process is cumbersome, requiring heating to prepare sol post spinning

Method used

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  • Preparation method for polycrystalline alumina fiber

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preparation example Construction

[0029] A method for preparing polycrystalline alumina fibers, the steps comprising:

[0030] 1) Preparation of electrospinning solution. First, the textile agent will be dissolved in an organic aqueous solution that can be dissolved in water, stirred and dissolved, and then the aluminum salt and its solubilizing agent are added to the previously prepared solution until the aluminum salt is completely dissolved; the used textile agent is polyvinyl alcohol, polyvinyl alcohol Vinylpyrrolidone and lactic acid, preferably polyvinylpyrrolidone (PVP), and the mass ratio of absolute ethanol to PVP is 15-7. The organic solvent used can be ethanol, acetone, and dimethylformamide, preferably a dilute solution of ethanol, and the quality of the added pure water is 40-65% of ethanol. The aluminum salts used are inorganic or organic aluminum salts, such as aluminum sulfate, aluminum chloride, aluminum nitrate, aluminum isopropoxide, aluminum acetate, preferably aluminum nitrate or aluminum...

Embodiment 1

[0034] Take 1 gram of PVP, put it into an Erlenmeyer flask, then weigh 9.0 grams of absolute ethanol and 5.0 grams of pure water, put them into the Erlenmeyer flask at room temperature, and stir magnetically until the PVP is completely dissolved. Then weigh 0.45 g of acetic acid and 5.2 g of aluminum acetate, add them to the conical flask in which the PVP was dissolved, and magnetically stir until completely dissolved. Control the operating temperature of the spinning chamber at 28°C and the relative humidity at 35%. Adjust the distance between the nozzle and the receiving device to 10cm, adjust the propulsion speed of the textile liquid to 6 ml / h, and the voltage to 13KV. Dry the collected filaments in an oven at 80°C for 20 hours, put them in a crucible, put them in a muffle furnace, set the heating rate at 6°C / min to 1200°C, and cool naturally to room temperature to obtain oxidation aluminum fiber.

Embodiment 2

[0036] Take 0.8 g of PVP and put it into a conical flask, then weigh 8.0 g of absolute ethanol and 4.0 g of pure water, put them into the conical flask at room temperature, and stir magnetically until the PVP is completely dissolved. Then weigh 0.4 g of lactic acid and 4.2 g of aluminum acetate, add them into the Erlenmeyer flask where the PVP was dissolved, and magnetically stir until completely dissolved. Control the operating temperature of the spinning chamber at 28°C and the relative humidity at 40%. Adjust the distance between the nozzle and the receiving device to 10cm, adjust the propulsion speed of the textile liquid to 8 ml / h, and the voltage to 15KV. Dry the collected silk in an oven at 80°C for 20 hours, put it in a crucible, put it in a muffle furnace, set the heating rate from 8°C / min to 1000°C, and cool it naturally to room temperature to obtain oxidation aluminum fiber.

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Abstract

A preparation method for polycrystalline alumina fiber relates to a method for preparing alumina fiber by adopting an electrospinning process. The preparation method is characterized by comprising the following steps: (1), preparing an electrospinning solution containing aluminum salt; (2), weaving the electrospinning solution into silk crude yarn; (3) burning the obtained crude yarn; (4) naturally cooling to the room temperature, so as to obtain the polycrystalline alumina fiber. The operation is only performed at the room temperature, the equipment is simple, the process conditions are controllable, the prepared alumina fiber is smooth in surface, the connection is tight, the strength is high, the length of the fiber is controllable, the quality is also controllable, the cost advantage is remarkable, the operation process is simple, and industrial production is easy to implement. With the adoption of the preparation method, the length of the fiber can be controlled, the operation process is simple, and industrialization is easy to implement.

Description

technical field [0001] A method for preparing polycrystalline alumina fibers relates to a method for preparing alumina fibers by using an electrospinning process. Background technique [0002] Alumina fiber has good high temperature resistance, wear resistance and oxidation resistance, and also has low thermal conductivity, small thermal expansion coefficient, good thermal shock resistance, high modulus, high plasticity, high strength, high insulation and high Dielectric constant and other advantages, is an important ceramic fiber. Compared with continuous carbon fiber, which is mainly used in the combustion chamber of high-performance military generators, boron fiber, which is mainly used in high-strength structural materials of military aircraft, and silica fiber, which is mainly used in traditional aerospace composite materials and ablation materials, alumina The fiber has low preparation cost, simple production process, high cost performance and great commercial value. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08C01F7/02
Inventor 王舟李东红胡文豪
Owner GUIZHOU BRANCH CHINA ALUMINUM IND