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
CN1844043AInactive Publication Date: 2006-10-11XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
XI AN JIAOTONG UNIV
Publication Date
2006-10-11
Estimated Expiration
Not applicable ยท inactive patent

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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.
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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 ฮผm, 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 ...

Claims

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