Process for preparing ZnO-Bi2O3 series pressure-sensitive ceramic chamotte doped with rare-earth oxide

A technology of rare earth oxides and varistor ceramics, applied in varistors, etc., can solve the problems of reduced nonlinear index, insignificant improvement, and increased leakage current

Inactive Publication Date: 2006-10-11
XI AN JIAOTONG UNIV
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Problems solved by technology

The low-temperature heat treatment does not significantly improve the "soft core" phenomenon of the potential gradient of large samples, and it is easy to cause the nonlinear index to decrease and the leakage current to increase

Method used

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  • Process for preparing ZnO-Bi2O3 series pressure-sensitive ceramic chamotte doped with rare-earth oxide
  • Process for preparing ZnO-Bi2O3 series pressure-sensitive ceramic chamotte doped with rare-earth oxide
  • Process for preparing ZnO-Bi2O3 series pressure-sensitive ceramic chamotte doped with rare-earth oxide

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Embodiment Construction

[0021] Below in conjunction with specific embodiment the present invention is described in further detail:

[0022] A Rare Earth Oxide Doped ZnO-Bi 2 o 3 A clinker preparation process for pressure-sensitive ceramics, comprising the following steps:

[0023] 1) Take Bi according to molar percentage 2 o 3 、Cr 2 o 3 、Co 2 o 3 、Ni 2 o 3 , MnCO 3 , SiO 2 、Ce 2 o 3 and Gd 2 o 3 0.3-0.7% each, Sb 2 o 3 0.7~1.2%, H 3 BO 3 0.05~0.1%, Al(NO 3 ) 3 9H 2O is 0.002-0.006%, and ZnO is 94-97% for weighing, and the specific composition is listed in Table 1; the above-mentioned components except ZnO are all reagent pure, and the main material ZnO is an industrial product dedicated to varistors. Pure, with an average particle size of about 0.5 μm.

[0024] composition

Bi 2 o 3

Sb 2 o 3

Cr 2 o 3

co 2 o 3

Ni 2 o 3

Ce 2 o 3

Gd 2 o 3

SiO 2

MnCO 3

h 3 BO 3

Al(NO 3 ) 3 9H 2 o

...

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Abstract

This invention discloses a preparation technology of rare-earth oxide doped ZnO-Bi2O3 group pressure sensitive ceramic, prefireing components except Al(NO3)3 9H2O in 900deg C for 30min, and then mixing ball milling granulating with Al(NO3)3 9H2O and residual ZnO, pressing to shape green compact, heating from room temperature to 1180deg C by the rate of 100-200deg C / h and preserving heat for 4h after discharging rubber, lowing temperature to room temperature by the rate of 60-200deg C / h; Annealing sintered body by 600-800deg C for 2h, the getted rare-earth oxide doping ZnO-Bi2O3 group pressure sensitive ceramic sample after detemperature rate 0.1-2deg C / min, the homogeneity of electric property is improved obviously, moreover, extenuating center soft+-phenomenon in high extent, can be used to make lightning protection arrester products of super / extra-high voltage electric transmission system.

Description

technical field [0001] The present invention relates to a kind of ZnO-Bi 2 o 3 A method for preparing pressure-sensitive ceramics, in particular to a rare earth oxide-doped ZnO-Bi 2 o 3 It is a preparation process of pressure-sensitive ceramic clinker. Background technique [0002] Improve ZnO-Bi 2 o 3 A conventional method to reduce the potential gradient of varistor ceramics is to reduce the size of ZnO grains. If in ZnO-Bi 2 o 3 The varistor ceramics are doped with an appropriate amount of rare earth oxides, and the rare earth oxides or their phases only exist at the grain boundaries, which play a significant "pinning" role, significantly inhibiting the growth of ZnO grains, and can make The ZnO grain size is reduced to about 5 μm, so the corresponding potential gradient value can reach 400V / mm or above. So doping rare earth oxides is recognized to improve ZnO-Bi 2 o 3 It is the main method of varistor ceramic potential gradient. [0003] At present, the rare ...

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Application Information

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IPC IPC(8): C04B35/453C04B35/622H01C7/10
Inventor 李盛涛成鹏飞
Owner XI AN JIAOTONG UNIV
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