ZnO-Bi2O3 pressure-sensitive ceramic dielectric doped with rare-earth oxide

Abstract

The invention discloses a process for preparing rare earth oxide doped ZnO-Bi2O3 family pressure-sensitive ceramic slurry, which comprises the following components (by molar portion): ZnO 91-98%, Bi2O3, Cr2O3, Co2O3, Ni2O3, MnCO3 and SiO2 each 0.1-1.0%, H3BO3 0.01-0.2%, Al(NO3)3 * 9H2O 0.001-0.01%, Sb2O3 0.5-2%, rare-earth oxide Ce2O3 or Gd2O3 0.1-1.0%.

Description

technical field [0001] The present invention relates to a kind of ZnO-Bi 2 o 3 It is a pressure-sensitive ceramic medium, especially a kind of rare earth oxide doped ZnO-Bi 2 o 3 It is a pressure-sensitive ceramic medium. 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 rare earth oxide doping on ZnO-Bi 2 o 3 Modification of varistor ceramics is an important method to improve the potential gradient of ceramic media. [0003] At present, the focus on the...

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Problems solved by technology

[0003] At present, the focus on the doping of rare earth oxides is mainly on the types of additives on the traditional ZnO-Bi 2 o 3 In the study of the influence of the microstructure of the varistor ceramics, and for the rare earth oxide doped modified ZnO-Bi 2 o 3 There is no public report on the composition of varistor ceramics