High-performance Pr series ZnO voltage sensitive ceramic material and preparation method thereof

A high-performance technology for varistor ceramics, which is applied in the field of high-performance Pr-based ZnO varistor ceramic materials and its preparation. It can solve the problems of preparation of Pr-based ZnO varistor ceramics that have not been reported, hinder large-scale application and commercialization, and have high nonlinear coefficients. problems, to achieve the effect of large nonlinear coefficient, less types and simple process methods

Active Publication Date: 2011-09-07
溧阳常大技术转移中心有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the Bi-based ZnO varistors (the nonlinear starting phase is Bi 2 o 3 ) There are many kinds of additives (6-8 kinds), and the active substance Bi in the process of liquid phase sintering 2 o 3 In recent years, Pr-based ZnO varistor ceramics (the nonlinear initial phase is Pr 6 o 11 ) has attracted more and more attention from researchers. Pr-based ZnO varistor ceramics have the advantages of fewer additives (3-4 types), simple microstructure, easy control, and good stability. However, due to its high sintering temperature and large energy consumption , the cost is relatively high, and the nonlinear coefficient is not as high as that of Bi-based ZnO varistors, which hinders its large-scale application and commercialization
[0003] The application of liquid phase coating method in the preparation of Pr-based ZnO varistor ceramics has not been reported so far

Method used

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  • High-performance Pr series ZnO voltage sensitive ceramic material and preparation method thereof
  • High-performance Pr series ZnO voltage sensitive ceramic material and preparation method thereof
  • High-performance Pr series ZnO voltage sensitive ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Preparation of nanocomposite ZnO powder

[0027] (1) Prepare Pr(NO 3 ) 3 , Co(NO 3 ) 2 , Mn(NO 3 ) 2 , Y(NO 3 ) 3 solution, according to 0.5% Pr 6 o 11 , 0.5% MnO, 1% CoO, 0.5% Y 2 o 3 (converted into oxide) proportioning mixing and stirring evenly;

[0028] (2) Prepare a mixed solution of ethylene glycol and ethanol at a volume ratio of 2:1, add the mixed solution obtained in step (1), and stir for more than 1 hour. Add 97.5% nano-ZnO particle size (50nm~100nm), ultrasonically disperse at 40°C for 4 hours, and stir at 80°C for 1 hour to form a suspension;

[0029] (3) Dry the suspension obtained in step (2) at 150°C for 8 hours, and calcinate at 450°C for 6 hours to obtain ZnO-coated powder (see e.g. figure 1 );

[0030] (4) After the ZnO-coated powder was calcined at 750° C. for 2 hours, the nanocomposite ZnO powder was obtained.

[0031] 2. Preparation of Pr-based ZnO varistor ceramics

[0032] (1) Adding mass fraction to the nanocomposite ZnO powd...

Embodiment 2

[0037] In this example, when the nanocomposite ZnO powder is prepared by the coating method, the molar ratio of each component (by oxide) is 0.5% Pr 6 o 11 , 0.8% MnO, 1% CoO, 0.7% Y 2 o 3 , 97% nano ZnO. The above materials were prepared into high-performance Pr-based ZnO varistor ceramics using the same process steps as in Example 1, the difference being that the sintering temperature of the ceramics was 1200°C.

[0038] The performance index of the ceramic is: varistor voltage V 1mA 830V / mm, nonlinear coefficient α is 28, leakage current J leak It is 4.4μA (measured at 83% varistor voltage).

Embodiment 3

[0039]Example 3 In this example, when the nanocomposite ZnO powder is prepared by the coating method, the molar ratio of each component (by oxide) is 0.5% Pr 6 o 11 , 1% MnO, 1% CoO, 1% Y 2 o 3 , 96.5% nano ZnO. The above materials were prepared into high-performance Pr-based ZnO varistor ceramics using the same process steps as in Example 1, the difference being that the sintering temperature of the ceramics was 1200°C.

[0040] The performance index of the ceramic is: varistor voltage V 1mA 790V / mm, nonlinear coefficient α is 32, leakage current J leak It is 5.2μA (measured at 83% varistor voltage).

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Abstract

The invention relates to a high-performance Pr series ZnO voltage sensitive ceramic material and a preparation method thereof, and belongs to the technical field of preparation and application of electronic ceramics. Nano composite ZnO ceramic powder is prepared by wrapping the surface of nano ZnO by a liquid phase deposition method, so that the doped components are mixed uniformly, the micro structure of a product is uniform, the performance of the Pr series ZnO voltage sensitive ceramic material is improved and the sintering temperature of the ceramic material is effectively reduced and the energy consumption is reduced. The Pr series ZnO voltage sensitive ceramic material with high electric potential gradient, a large nonlinear coefficient, and small leakage current is prepared by optimizing the reasonable ratio of all doped components and combining a liquid phase wrapping process, and meets the requirements of high-voltage and supervoltage high-quality arresters and other devices; and the variety of the doped elements for preparing the high-voltage ZnO voltage sensitive ceramic is few, the source of the doped elements is abundant, and the method is simple, so that production cost is lowered.

Description

technical field [0001] The invention relates to a high-performance Pr-based ZnO pressure-sensitive ceramic material and a preparation method, belonging to the technical field of electronic ceramic preparation and application. Background technique [0002] ZnO varistor ceramic material is a multifunctional composite ceramic material modified with ZnO as the main body and modified by adding some other metal oxides. It has the advantages of excellent non-ohmic characteristics, fast response time (20-50ns), small leakage current, and large flow capacity. It is widely used in key overvoltage protection devices in power systems and electronic systems to absorb surge energy. Prevent electrical surges from damaging electronic equipment or systems. With the development of electronic information and home appliance industry, higher requirements are put forward for the performance of varistors. Since the Bi-based ZnO varistors (the nonlinear starting phase is Bi 2 o 3 ) There are ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622
Inventor 王茂华李刚王秋丽姚超
Owner 溧阳常大技术转移中心有限公司
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