Preparation method of composite nano ZnO voltage-sensitive ceramic powder

A pressure-sensitive ceramic and powder technology, which is used in the preparation and application of electronic ceramics, can solve the problems of high production cost, different particle sizes, complex processes, etc., and achieves high potential gradient, large nonlinear coefficient and small leakage current. Effect

Active Publication Date: 2014-07-30
颍上县祥盛建设管理有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing ZnO pressure-sensitive ceramic materials, which overcomes the shortcomings of the traditional solid-phase method using oxides as raw materials to prepare nanocomposite ZnO powders, and solves the problem that most of the current ZnO pressure-sensitive ceramic materials need to be prepared by powder ZnO powder is produced by sintering the body, the process is complex, the production cost is high, and the obtained zinc oxide has uneven morphology and particle size. According to the heating and reflow method to improve the microstructure of ZnO powder, improve the ZnO pressure-sensitive ceramic material. electrical properties

Method used

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  • Preparation method of composite nano ZnO voltage-sensitive ceramic powder
  • Preparation method of composite nano ZnO voltage-sensitive ceramic powder
  • Preparation method of composite nano ZnO voltage-sensitive ceramic powder

Examples

Experimental program
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Embodiment 1

[0029] 1. Preparation of nanocomposite ZnO powder

[0030] (1) Dissolve 11.4349g of zinc nitrate into a 0.1 mol / L solution; dissolve bismuth nitrate, cobalt nitrate, and manganese chloride into aqueous solutions, respectively, and add them to 0.1 mol / L zinc nitrate solution under stirring. The added amount of the substance conforms to the molar ratio of 95:3:1:1, and the pH of the solution is adjusted to 8 with ammonia water, and stirring is continued for 2h.

[0031] (2) The obtained precipitate was filtered with suction, and washed with deionized water and ethanol to remove impurities. The obtained precursor was refluxed in ethanol medium for 2 hours, and the reflux temperature was controlled at 80 °C.

[0032] (3) Finally, the powder obtained by reflux was suction filtered, and washed with deionized water and ethanol to remove impurities. Finally, it was dried in a vacuum drying oven at 70 °C for 4 hours. After taking out, it was ground in an agate mortar to obtain nanocomp...

Embodiment 2

[0037] In this example, when preparing nanocomposite ZnO powder, the weight of each component is the same as in Example 1. The pH value of the solution is adjusted with ammonia water to 8.5, and stirring is continued for 2 hours; Reflux for 3 hours; the above materials are prepared into ZnO varistor ceramics by the same process steps as those in Example 1, the difference is that the sintering temperature of the ceramics is 1150°C.

Embodiment 3

[0039] In this example, when preparing nanocomposite ZnO powder, the weight of each component is the same as in Example 1, the pH value of the solution is adjusted with ammonia water to 8, and stirring is continued for 2 hours; Reflux for 4 hours; the above materials are prepared into ZnO varistor ceramics by the same process steps as those in Example 1, the difference is that the sintering temperature of the ceramics is 1050°C.

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Abstract

The invention relates to a ZnO voltage-sensitive ceramic material and particularly relates to a preparation method of composite nano ZnO voltage-sensitive ceramic powder. The preparation method comprises the following steps: preparing soluble zinc salt, bismuth salt, cobalt salt and manganese salt which are used as raw materials, respectively preparing into aqueous liquor, mixing 95% (in mole percentage) of ZnO, 3% of Bi2O3, 1% of CoO and 1% of MnO, and uniformly stirring; slowly adding ammonia water into mixed liquor obtained in the step (1), regulating the pH to 8-8.5 to obtain mixed liquor, continuously stirring until mixing uniformly; carrying out suction filtration onto precipitates obtained in the step (2), sufficiently washing to remove impurities by using deionized water and alcohol, placing obtained precursor in water or alcohol medium for refluxing for 2-8 hours, and controlling a refluxing temperature to 70 DEG C-80 DEG C; finally, carrying out suction filtration on the powder obtained by refluxing, sufficiently washing to remove impurities by using deionized water and alcohol, finally drying in a vacuum drying box, and grinding to obtain nano composite ZnO powder.

Description

technical field [0001] The invention relates to a ZnO pressure-sensitive ceramic material, in particular to a preparation method of a composite nano-ZnO pressure-sensitive ceramic powder, and belongs to the technical field of electronic ceramic preparation and application. Background technique [0002] The ZnO varistor ceramic material is a multifunctional composite ceramic material modified by ZnO powder as the main body and adding a small amount of various metal oxides. It has nano-effects such as surface effect, small size effect, quantum size effect, and excellent nonlinear voltage. Due to its safety characteristics and huge pulse energy absorption capacity, nano-ZnO is widely used in power systems and electronic circuits. [0003] ZnO varistor ceramics are mainly prepared by the traditional high temperature solid phase sintering method. 2 O 3 It is mixed with CoO and other metal oxides to be ball-milled, pressed and formed, and then subjected to high-temperature solid...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/626
Inventor 王茂华马小玉江雯
Owner 颍上县祥盛建设管理有限公司
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