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Low-temperature sintering method of high potential gradient voltage-sensitive ceramic material

A low-temperature sintering and pressure-sensitive ceramic technology, which is applied in the field of high-potential gradient zinc-bismuth oxide-based pressure-sensitive ceramic materials and their low-temperature sintering, can solve the problems of limited application, high price, and difficulty in preparing ceramic powder materials in large quantities. The effect of low cost, high performance and wide application prospects

Inactive Publication Date: 2013-05-01
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, ordinary wet chemical methods use soluble salts as raw materials, and soluble salts of rare earth elements are expensive, and it is not easy to prepare ceramic powder materials in large quantities, which limits their industrial applications.

Method used

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  • Low-temperature sintering method of high potential gradient voltage-sensitive ceramic material

Examples

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Effect test

Embodiment 1

[0034] Example 1: With ZnO, Bi 2 o 3 , Sb 2 o 3 、Co 2 o 3 , MnO 2 、Cr 2 o 3 and B 2 o 3 As raw material, according to the molar ratio of 97.5% ZnO, 0.5% Bi 2 o 3 , 0.5%Sb 2 o 3 , 0.5%Co 2 o 3 , 0.5%MnO 2 , 0.5%Cr 2 o 3 Weigh, then add and (97.5%ZnO+0.5%Bi 2 o 3 +0.5%Sb 2 o 3 + 0.5%Co 2 o 3 +0.5%MnO 2 +0.5%Cr 2 o 3 ) mass ratio is 0.5%, 1.0%, 1.5%, 2.0% of B 2 o 3 . According to the conventional solid-phase synthesis method, batching, ball milling and mixing for 8 hours, drying, adding 3wt% PVA binder, molding, plastic discharge (550°C, 1h), and sintering at 850°C for 5 hours, the pressure-sensitive ceramics can be formed, as shown in the following table 1 In order to obtain the electrical properties of the varistor ceramics under this formula.

[0035]

[0036] figure 2 In order to utilize the ZnO-Bi prepared in Example 1 of this technical solution after being incubated at 850°C for 5 hours 2 o 3 The XRD analysis spectrum of the varistor ...

Embodiment 2

[0037] Example 2: With ZnO, Bi 2 o 3 , Sb 2 o 3 、Co 2 o 3 , MnO 2 、Cr 2 o 3 and B 2 o 3 As raw material, according to the molar ratio of 97.5% ZnO, 1% Bi 2 o 3 , 0.5%Sb 2 o 3 , 0.5%Co 2 o 3 , 0.3%MnO 2 , 0.2%Cr 2 o 3 Weigh, then add and (97.5%ZnO+1%Bi 2 o 3 +0.5%Sb 2 o 3 +0.5%Co 2 o 3 + 0.3%MnO 2 +0.2%Cr 2 o 3 ) mass ratio is 0.5%, 1.0%, 1.5%, 2.0% of B 2 o 3 . According to the conventional solid-phase synthesis method, batching, ball milling and mixing for 8 hours, drying, adding 8wt% PVA binder, molding, plastic discharge (550°C, 1h), sintering at 870°C for 2h, the pressure-sensitive ceramics can be formed.

[0038] Table 2 below shows the electrical properties of the varistor ceramics obtained under this formulation.

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Abstract

The invention discloses a ZnO-Bi2O3-based piezoresistor material with adjustable potential gradient of 600 V / mm to 1,450V / mm and a low-temperature sintering method thereof. The material consists of 92 to 98.5mol% of zinc oxide, 0.3 to 2mol% of bismuth trioxide Bi2O3 and the balance of additives such as Sb, Co,Mn, Cr, B elements and the like. According to a formula, the corresponding raw materials are weighed; and after heat is preserved for 2 to 5 hours at a temperature of 830 to 870 DEG C by utilizing a solid-phase sintering method, a corresponding voltage-sensitive ceramic material is obtained. The ZnO-Bi2O3-based piezoresistor material obtained by the invention has voltage-sensitive field intensity of 600V / mm to 1,450V / mm, nonlinear coefficient alpha of over 40 and leakage current IL of more than or equal to 0.1muA and has low sintering temperature and excellent comprehensive performance; and moreover, the preparation method disclosed by the invention has the advantages of simple process, low energy consumption, green, environmental-friendliness and the like and has wide application prospect.

Description

technical field [0001] The invention belongs to the field of high-potential gradient zinc oxide-bismuth series pressure-sensitive ceramic materials and low-temperature sintering thereof, and in particular relates to a high-potential gradient ZnO-Bi 2 o 3 The invention relates to a pressure-sensitive ceramic material and a low-temperature sintering method thereof. Background technique [0002] With the development of high-voltage power systems, etc., the requirements for the varistor voltage of varistors used to protect power systems are also increasing. The zinc oxide (ZnO) varistor is a polycrystalline semiconductor device made of ceramic technology with ZnO as the main material and various other trace elements added. With its large nonlinear coefficient, fast response speed, strong flow capacity and other excellent electrical properties, it has quickly become the leading material for protecting power systems (1. M. Matsuoka. Nonohmic Properties of Zinc OxideCeramics. Jap...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/63C04B35/453
Inventor 徐志军初瑞清马帅汪宁李艳
Owner LIAOCHENG UNIV
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