Process for the chemical preparation of high-field ZnO varistors

Details Process for the chemical preparation of high-field ZnO varistors Process for the chemical preparation of high-field ZnO varistors

1986-02-19

1987-07-21

Barr, Josephine L.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 66, 252518, 252519, C04B 3334, H01B 106

Patent

active

046817174

ABSTRACT:
Chemical preparation techniques involving co-precipitation of metals are used to provide micro-structural characteristics necessary in order to produce ZnO varistors and their precursors for high field applications. The varistors produced have homogeneous and/or uniform dopant distributions and a submicron average grain size with a narrow size distribution. Precursor powders are prepared via chemical precipitation techniques and varistors made by sintering uniaxially and/or isostatically pressed pellets. Using these methods, varistors were made which were suitable for high-power applications, having values of breakdown field, E.sub.B, in the 10-100 kV/cm range, .alpha.>30 and densities in the range of 65-99% of theoretical, depending on both composition and sintering temperature.

REFERENCES:
patent: 4540971 (1985-09-01), Kanai et al.
patent: 4575440 (1986-03-01), Palilla

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