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Preparation method of ZnO/Bi2O3 composite powder

A nano-powder and aqueous solution technology, which is applied in the field of composite nano-powder preparation, can solve the problems of weak core-shell structure binding force, poor coating effect, and fuzzy composite powder shape, and achieve low cost, Avoid agglomeration and easy access to raw materials

Inactive Publication Date: 2015-01-21
佛山市顺德区杰盈实业有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the preparation methods of zinc oxide pressure-sensitive composite powder are mainly divided into two categories: solid-phase mechanical ball milling method and liquid-phase chemical method; the core-shell nanocomposite particles prepared by high-energy ball milling method doped with metal particles reported by Wang Wei et al. However, the obtained composite powder has fuzzy appearance, large particle size, and long stirring time. Although the solid phase mechanical ball milling method is simple to operate and low in cost, the product has low purity and uneven particle distribution; the surface coating of the powder is Use physical or chemical methods to treat the particle surface, consciously change the physical and chemical properties of the particle surface, design and prepare nano-zinc oxide with core-shell structure through surface coating technology, and then improve the sintering and microstructure of pressure-sensitive ceramics It is of great significance to promote the application of zinc oxide nanopowders in electronic ceramics; the properties of nanoparticles coated by mechanical ball milling have been improved, but the binding force of the core-shell structure is not strong, and the coating effect is not good. very good

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  • Preparation method of ZnO/Bi2O3 composite powder
  • Preparation method of ZnO/Bi2O3 composite powder
  • Preparation method of ZnO/Bi2O3 composite powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. ZnO / Bi 2 o 3 Powder preparation

[0030](1) Weigh 7.8175g of ammonium bicarbonate and 14.7130g of zinc nitrate to prepare aqueous solutions with a concentration of 0.1 mol / L.

[0031] (2) Add the zinc nitrate solution prepared in step (1) into the ammonium bicarbonate solution, stir constantly, keep the reaction temperature at 50°C, and after the reaction is carried out for 30min, a white basic zinc carbonate precipitate (zinc carbonate) is obtained .

[0032] (3) Suction filter the precipitate obtained in step (2), weigh the basic zinc carbonate obtained by filtration (5.1413g), add 51.4130g distilled water to further disperse, and form a dispersion slurry (solid content 10%)

[0033] (4) Weigh 11.7328g ammonium bicarbonate and 0.4836g bismuth nitrate to make 0.1 mol / L aqueous solution respectively.

[0034] (5) Add the ammonium bicarbonate solution prepared in step (4) to the slurry prepared in step (3), keep stirring, and keep the system at 50°C, then slowly a...

Embodiment 2

[0041] In this example, the ZnO / Bi 2 o 3 When it is powder, weigh 1.4553g bismuth nitrate, calculate by mole percentage, so that it meets 97% ZnO, 3% Bi 2 o 3 The proportioning ratio; the weights of the other components are the same as in Example 1; the above materials are prepared into ZnO varistor ceramics using the same process steps as in Example 1.

Embodiment 3

[0043] In this example, the ZnO / Bi 2 o 3 When powder, weigh 2.4255g bismuth nitrate, calculate by mole percentage, make accord with 95% ZnO, 5% Bi 2 o 3 The proportioning ratio; the weights of the other components are the same as in Example 1; the above materials are prepared into ZnO varistor ceramics using the same process steps as in Example 1.

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Abstract

The invention relates to a preparation method of ZnO / Bi2O3 composite powder. The method comprises the following steps: reacting a zinc nitrate solution with a certain concentration with an ammonium bicarbonate solution to obtain basic zinc carbonate, filtering and washing the basic zinc carbonate, dispersing into a slurry, adding the ammonium bicarbonate solution to continue the reaction for some time, slowly adding a bismuth nitrate solution, and completely reacting until the bismuth precipitate is completely coated on the zinc precipitate surface, thereby finally obtaining the simultaneous core-shell structure ZnO / Bi2O3 nano powder. The technique saves a plurality of drying and roasting links, and more importantly, can implement uniform coating by controlling the state of the precursor and enhance the combination compactness between the coating and base. The ZnO / Bi2O3 composite powder prepared by the method has the advantages of uniform particles and small particle size; and the sintered ZnO pressure-sensitive ceramic has high compactness.

Description

technical field [0001] The present invention relates to a kind of ZnO / Bi 2 o 3 A method for preparing composite nanomaterials, more precisely, the present invention relates to a method for preparing ZnO / Bi with a core-shell structure by an in-situ coating method 2 o 3 The nano powder method belongs to the technical field of composite nano powder preparation. Background technique [0002] ZnO is a II-VI wide bandgap direct bandgap wide bandgap semiconductor compound material, its bandgap at room temperature is 3.37eV, it has n-type semiconductor conductivity, it is a hexagonal wurtzite crystal structure, and its crystal form belongs to the hexagonal crystal system . ZnO nanomaterials have small scale, huge surface area, stable performance, outstanding photoelectric response characteristics, and ultra-fast time effect, so ZnO is widely used in building detectors, photovoltaic fields, and degrading organic pollutants; ZnO varistor electronic ceramics are based on ZnO is a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/01C04B35/48C04B35/626C04B35/628
Inventor 王茂华江雯马小玉
Owner 佛山市顺德区杰盈实业有限公司
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