Compositions – Electrically conductive or emissive compositions – Metal compound containing
Patent
1991-08-27
1993-07-06
Bell, Mark L.
Compositions
Electrically conductive or emissive compositions
Metal compound containing
252518, 252500, 501126, 338 20, 338 21, H01C 710, H01C 713, H01B 106
Patent
active
052251110
ABSTRACT:
An improved voltage non-linear resistor having a superior voltage-current characteristic property, a superior switching current impulse withstand capability, a superior lightning current impulse withstand capability, and a large discharge voltage V.sub.0.1mA of 230-330 V/mm, a small deterioration rate of the discharge voltage V.sub.0.1mA after applying a lightning current impulse, a prolonged electric life under electrical stress and an improved discharged voltage at a large current area is provided which contains zinc oxide as a main component, and desired amounts of subsidiary components of bismuth oxide, cobalt oxide, manganese oxide, antimony oxide, chromium oxide, silicon oxide, nickel oxide, aluminum oxide, boron oxide and silver oxide. The resistor has a discharge voltage of V.sub.0.1mA of 230-330 V/mm at a current density of 0.1 mA/cm.sup.2 calculated per unit thickness of the sintered resistor, a discharge voltage ration V.sub.10A /V.sub.0.1mA of 1.2-1.45 a current densities of 10 A/cm.sup.2 and 0.1 mA/cm.sup.2, a deterioration rate of discharge voltage of not more than 10% at a current density of 0.1 mA/cm.sup.2 before and after twice applying a lightning current impulse of a current density of 5 KA/cm.sup.2 (4/10 .mu.s wave form), and discharge voltage ratio V.sub.0.1mA /V.sub.1.mu.A of not more than 1.4 at current densities of 0.1 mA/cm.sup.2 and 1 .mu.A/cm.sup.2.
REFERENCES:
patent: 4285839 (1981-08-01), Wong
patent: 4535314 (1985-08-01), Kanai et al.
patent: 4551268 (1985-11-01), Eda et al.
Bell Mark L.
Bonner C. M.
NGK Insulators Ltd.
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