Process for preparing ZnO-Bi2O3 series pressure-sensitive raw material 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 mixing all the addition constituents with main ingredient ZnO directly, ball grinding and granulating, compacting into blanks, discharging glue and heating, cooling down, subjecting the sintered body to heat treatment and cooling down again.

Description

technical field [0001] The present invention relates to a kind of ZnO-Bi 2 o 3 A method for preparing pressure-sensitive ceramics, especially a rare earth oxide-doped ZnO-Bi 2 o 3 It is a raw material preparation process for pressure-sensitive ceramics. 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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Problems solved by technology

In fact, X-ray diffraction also found that the surface layer Bi of large samples 2 o 3 The grain boundaries are relatively perfect, while the internal Bi 2 o 3 The grain boundary phase is not perfect, and the phase state is not perfect Bi 2 o 3 The grain boundary phase reduces the diffusion rate of oxygen

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