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    • 1. 发明申请
    • VARISTORS BASED ON NANOCRYSTALLINE POWDERS PRODUCED BY MECHANICAL GRINDING
    • 基于通过机械磨削生产的纳米晶粉的变性
    • WO99009564A1
    • 1999-02-25
    • PCT/CA1998/000769
    • 1998-08-11
    • H01C7/10H01C7/112H01C17/065
    • H01C17/06546H01C7/112
    • The invention concerns novel varistors based on zinc oxide and a method for making same, which consists in using as base products nanocrystalline powders obtained by high-intensity mechanical grinding and in subjecting the mixture resulting from said nanocrystalline powders a consolidating treatment such as sintering, in suitably selected temperature and time conditions so as to retain the smallest possible grain size of ZnO. The resulting varistors have a very fine homogeneous microstructure and an average grain size characteristically not more than 3 mu m, i.e. five times smaller than standard materials. Said novel varistors have a larger number of grain boundaries per length unit and therefore a much higher breakdown voltage. Said voltage is characteristically higher than 10 kV/cm and can reach 17 kV/cm which is almost one order of magnitude above the breakdown voltage of standard varistors. The non-linearity coefficient of the current-voltage curve is also improved, and is greater than 20 and can reach values as high as 60. Moreover, the leakage currents below the breakdown voltage of said varistors, are much weaker.
    • 本发明涉及基于氧化锌的新型变阻器及其制造方法,其特征在于,使用通过高强度机械研磨获得的纳米晶体粉末作为基底产品,并将由所述纳米晶体粉末得到的混合物进行固结处理如烧结, 适当选择的温度和时间条件,以保持ZnO的最小可能的晶粒尺寸。 所得的压敏电阻具有非常精细的均匀微观结构,平均晶粒尺寸特征不大于3μm,即比标准材料小五倍。 所述新型压敏电阻每个长度单位具有更大数量的晶界,因此具有更高的击穿电压。 所述电压特性高于10kV / cm,可达到17kV / cm,比标准压敏电阻的击穿电压高出一个数量级。 电流 - 电压曲线的非线性系数也有所提高,大于20,可达到高达60的值。此外,低于所述压敏电阻的击穿电压的漏电流要弱得多。