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A method for preparing alumina microsphere powder by liquid-phase cathode plasma electrolysis

A liquid-phase plasma, alumina technology, applied in the electrolysis process, electrolysis components, cells, etc., can solve the problems of uneven particle size distribution of alumina microspheres, complex process, high cost, and avoid easy agglomeration and grain growth. , The preparation process is simple and the cost saving effect

Active Publication Date: 2017-06-16
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some methods, such as spray drying method and spray pyrolysis method, have simple preparation process, but the particle size distribution of alumina microspheres is uneven and the shape is poor; while some methods, such as sol-gel method, the microspheres prepared The appearance is controllable, but the process is complicated and the cost is high

Method used

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  • A method for preparing alumina microsphere powder by liquid-phase cathode plasma electrolysis

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Effect test

Embodiment 1

[0019] Embodiment 1: adopt titanium alloy as cathode material

[0020] Pulse power supply is used, the frequency is 500Hz, and the duty ratio is 60%. The platinum sheet is used as the anode; the titanium alloy is used as the cathode; h. The arcing voltage is 120V, and then gradually rises to 170V. Then the electrolyte was allowed to stand still, and turbidity appeared at the bottom, passed through a centrifuge (4000 rpm), and centrifuged three times with distilled water and alcohol respectively. Afterwards, it was kept at 105° C. in a blast drying oven, and dried to obtain a powder.

Embodiment 2

[0021] Embodiment 2: Adopt aluminum alloy as cathode material

[0022] Using pulse power supply, frequency 500Hz, duty cycle 60%; platinum sheet as anode; aluminum alloy as cathode; electrolyte is 300g / L aluminum nitrate nonahydrate, 25g / L polyethylene glycol, plasma electrolysis time is 2~ 2.5h. The arcing voltage is 100V, and then gradually rises to 170V. A coated titanium alloy and an electrolyte are obtained. Among them, the electrolyte was left standing, and turbidity appeared at the bottom. After high-speed centrifugation, it was centrifuged three times with distilled water and alcohol respectively. Afterwards, it was kept at 105° C. in a blast drying oven, and dried to obtain a powder.

Embodiment 3

[0023] Example 3: Changing the electrolyte concentration

[0024] Using pulse power supply, frequency 500Hz, duty cycle 60%; platinum sheet as anode; titanium alloy as cathode; electrolyte solution is 150g / L aluminum nitrate nonahydrate, 15g / L polyethylene glycol, and the plasma electrolysis time is 3~ 3.5h. The arcing voltage is 120V, and then gradually rises to 150V. Then the electrolyte was left to stand, passed through a centrifuge (4000 rpm), and centrifuged three times with distilled water and alcohol respectively. After drying, powder is obtained.

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Abstract

The invention relates to a method for preparing alumina microspheres, belonging to the field of inorganic non-metallic materials. The present invention integrates liquid-phase deposition and gas-phase evaporation and condensation, uses aluminum salt solution as the basic electrolyte, adds water-soluble polymers as modifiers, and controls the area ratio and arcing voltage of cathode and anode in an electrolytic cell. The hydrogen evolution reaction occurs on the surface of the cathode and plasma is generated through the hydrogen film, and alumina microspheres are obtained on the surface of the cathode and in the electrolyte. After the cathode plasma treatment, the electrolyte is centrifuged and dried to obtain solid or hollow or semi-hollow alumina microspheres with a particle size distribution between 5 μm and 30 μm, which have low density, regular shape, uniform particle size distribution and good flow characteristics. specialty. Compared with the existing conventional powder preparation technology, the preparation method of the present invention is simple, the one-time input cost is low, and high-temperature roasting treatment is not required.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and relates to a technology for preparing alumina microsphere powder by using a liquid-phase cathode plasma electrolysis method. Background technique [0002] Alumina has the advantages of high temperature resistance, corrosion resistance and good insulation, and is an important biological and chemical material. Alumina microspheres with a special structure not only have the basic characteristics of alumina, but also have the advantages of large specific surface area, low thermal conductivity, and strong chemical stability. They are used in catalysts, catalyst carriers, molecular sieves, micro-nano devices, electronic materials, Medicines and biological materials, lightweight materials and thermal insulation materials have broad markets and huge application prospects. [0003] Therefore, many researches and developments focus on the preparation of alumina micropowder. Patent CN16...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/00C25B9/06C25B9/17
Inventor 张津刘宸旭何业东王鹏邓舜杰权成
Owner UNIV OF SCI & TECH BEIJING
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