ZnO-Bi2O3-B2O3 series voltage-sensitive material sintered at lower temperature and preparation method thereof

A varistor, low-temperature sintering technology, applied in the fields of TiO2, nO, easy to make ceramic sheets, Cr2O3, Bi2O3, Co2O3, can solve the problem of affecting the coating quality of ceramic sheet electrodes, the drop of voltage sensitive parameters of devices, and affecting the product rate, etc. problem, to achieve the effect of optimizing voltage-sensitive comprehensive performance, good voltage-sensitive comprehensive performance, and promoting grain growth

Active Publication Date: 2012-12-05
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

ZnO-Bi 2 o 3 -Sb 2 o 3 The varistor materials generally have good voltage-sensitive comprehensive performance, but due to the existence of a certain amount of Sb which inhibits the grain growth 2 o 3 , the sintering temperature is relatively high, generally between 1100 ° C and 1300 ° C, high sintering temperature not only easily deforms the ceramic sheet, affects the coating quality of the ceramic sheet electrode, thus affecting the product rate, but also easily makes the low melting point group Divide like Bi 2 o 3 , Sb 2 o 3 Excessive volatilization leads to a decrease in the voltage sensitive parameters of the device

Method used

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  • ZnO-Bi2O3-B2O3 series voltage-sensitive material sintered at lower temperature and preparation method thereof
  • ZnO-Bi2O3-B2O3 series voltage-sensitive material sintered at lower temperature and preparation method thereof

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Embodiment 1

[0034] The main component material is composed of the following mole percentage raw materials: 94.5% ZnO, 1.18% Bi 2 o 3 , 0.1% TiO 2 , 2% Co 2 o 3 , 0.1%Cr 2 o 3 , 2% MnCO 3 , 0.1% NiO and 0.02% Al 2 o 3 . The oxide of boron is boric acid, and the addition amount of boric acid, relative to 100 parts by weight of zinc oxide, is expressed as B 2 o 3 It is 3.0 weight part in conversion.

[0035] Mix the boric acid and the main component material according to the above dosage, and then use deionized water and zirconium balls to mill in a planetary ball mill for 3 hours, and then dry at 90°C for 12 hours to obtain low-temperature sintered ZnO-Bi 2 o 3 -B 2 o 3 Department of varistor powder. Low temperature sintered ZnO-Bi 2 o 3 -B 2 o 3 The varistor powder is pressurized into a disc-shaped molded body, placed in the atmosphere and heated to 850°C at a heating rate of 300°C / hour, kept for 2 hours and then cooled with the furnace to obtain low-temperature sintered...

Embodiment 2

[0040] The main component material is composed of the following mole percentage raw materials: 96.5% ZnO, 0.3% Bi 2 o 3 , 0.895% TiO 2 , 0.1% Co 2 o 3 , 1%Cr 2 o 3 , 0.2% MnCO 3 , 1% NiO and 0.005% Al 2 o 3 . The oxide of boron is diboron trioxide, and the addition amount of diboron trioxide, relative to 100 parts by weight of zinc oxide, is B 2 o 3 It is 2.2 parts by weight in conversion.

[0041] Mix diboron trioxide and the main component materials evenly according to the above dosage, then use deionized water and zirconium balls to ball mill in a planetary ball mill for 5 hours, and then dry at 80°C for 15 hours to obtain low-temperature sintered ZnO-Bi 2 o 3 -B 2 o 3 Department of varistor powder. Low temperature sintered ZnO-Bi 2 o 3 -B 2 o3 The varistor powder is pressurized into a disc-shaped molded body, placed in the atmosphere and heated to 950°C at a heating rate of 120°C / hour, kept for 3 hours and then cooled with the furnace to obtain low-temper...

Embodiment 3

[0045] The main component material is composed of the following molar percentages of raw materials: 92.5% ZnO, 5% Bi 2 o 3 , 0.55% TiO 2 , 0.5% Co 2 o 3 , 0.5%Cr 2 o 3 , 0.5% MnCO 3 , 0.4% NiO and 0.05% Al 2 o 3 . Boron oxide is boric acid, the addition amount of boric acid, relative to 100 parts by weight of zinc oxide, with B 2 o 3 It is calculated as 10 parts by weight in conversion.

[0046] Mix the boric acid and the main component material according to the above dosage, and then use deionized water and zirconium balls to mill in a planetary ball mill for 3 hours, and then dry at 95°C for 10 hours to obtain low-temperature sintered ZnO-Bi 2 o 3 -B 2 o 3 Department of varistor powder. Low temperature sintered ZnO-Bi 2 o 3 -B 2 o 3 The varistor powder is pressurized into a disc-shaped molded body, placed in the atmosphere and heated to 900°C at a heating rate of 180°C / hour, kept for 3 hours and then cooled with the furnace to obtain low-temperature sinter...

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Abstract

The invention discloses a ZnO-Bi2O3-B2O3 series voltage-sensitive material sintered at lower temperature, which is prepared from the following raw materials, such as ZnO, Bi2O3, TiO2, Co2O3, Cr2O3, MnCO3, NiO, Al2O3 and oxides of boron. In B2O3 terms, the additive amount of the oxides of boron is 2.2-20 parts by weight as comparison with 100 parts by weight of ZnO. The material contains no Sb2O3,has lower sintering temperature and favorable voltage-sensitive comprehensive properties. The invention also discloses a preparation method of the material, which is simple in process and easy to operate.

Description

technical background [0001] The invention belongs to the technical field of varistor materials, in particular to a low-temperature sintered ZnO-Bi 2 o 3 -B 2 o 3 The invention relates to a varistor material and a preparation method thereof. Background technique [0002] Due to its excellent pressure-sensitive characteristics, zinc oxide varistors have attracted the attention of researchers since their inception, and have been widely used in arresters all over the world. The usual zinc oxide varistor materials use ZnO as the main component, and by adding Bi 2 o 3 , Sb 2 o 3 , MnO 2 、Co 2 o 3 、Cr 2 o 3 A sintered body (or ceramic) made of other metal oxides (generally containing 8-10 kinds) according to the ordinary electronic ceramic process. These additives can be divided into three categories according to the mechanism of action: (1) Additives that promote the formation of grain boundary structure of zinc oxide varistor ceramics, such as Bi 2 o 3 , BaO, SrO, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/453C04B35/622
Inventor 刘丰华许高杰段雷李勇崔平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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