Claims
- 1. A voltage-dependent non-linear resistor member prepared by a process comprising adding at least one oxide of a rare earth element R selected from Y, Ho, Er and Yb in an amount of 0.05-1.0 mol % in terms of R.sub.2 O.sub.3 to a composition principally containing zinc oxide and further containing bismuth oxide to form a mixture, and then burning the mixture to form a sintered material including zinc oxide crystal grains,
- wherein Al is further added to the composition such that Al.sub.2 O.sub.3 is present in the sintered material in an amount of 0.0005-0.004 mol %,
- wherein the sintered material is the voltage-dependent non-linear resistor member, and
- wherein Sb and Si are further added to the composition, and the sintered material includes oxide grains composed of the rare earth element R, Bi and Sb, and crystal grains of zinc silicate, Zn.sub.2 SiO.sub.4, which exist between or inside of said zinc oxide crystal grains.
- 2. A voltage-dependant non-linear resistor member prepared by a process comprising adding at least one of a rare earth element R selected from Y, Ho, Er and Yb in an amount of 0.05-1.0 mol % in terms of R.sub.2 O.sub.3 to a composition principally containing zinc oxide and further containing bismuth oxide to form a mixture, and then burning the mixture to form a sintered material including zinc oxide crystal grains,
- wherein the sintered material is the voltage-dependant non-linear resistor member, and
- wherein Sb, Si and Mn are further added to the composition, and the sintered material includes oxide grains composed of the rare earth element R, Bi, Sb, Zn and Mn, and crystal grains of zinc silicate, Zn.sub.2 SiO.sub.4, which exist between or inside of said zinc oxide crystal grains, and
- wherein the voltage-dependant non-linear resistor comprises the oxide grains of the rare earth element R, Bi, Sb, Zn and Mn in amounts of 20.7-39.3, 4.8-10.8, 24.8-33.2, 31.7-40.7 and 0.6-2.0 mol %, respectively, of all of the oxide grains in terms of R.sub.2 O.sub.3, Bi.sub.2 O.sub.3, Sb.sub.2 O.sub.3, ZnO and Mn.sub.3 O.sub.4, respectively.
- 3. An arrester equipped with the voltage-dependant non-linear resistor member according to claim 2.
- 4. The voltage-dependent non-linear resistor member according to claim 2 wherein Al is further added such that Al.sub.2 O.sub.3 is present in the sintered material in an amount of 0.0005-0.004 mol %.
Priority Claims (2)
Number |
Date |
Country |
Kind |
8-101202 |
Apr 1996 |
JPX |
|
8-243746 |
Sep 1996 |
JPX |
|
Parent Case Info
This is a continuation of Application Ser. No. 08/813,594 filed Mar. 7, 1997, now U.S. Pat. No. 5,910,761 the disclosure of which is incorporated herein by reference.
US Referenced Citations (12)
Foreign Referenced Citations (6)
Number |
Date |
Country |
52-11756 |
Nov 1972 |
JPX |
54-57699 |
May 1979 |
JPX |
61-43404 |
Mar 1986 |
JPX |
4-175259 |
Jun 1992 |
JPX |
6-321617 |
Nov 1994 |
JPX |
8-115805 |
May 1996 |
JPX |
Non-Patent Literature Citations (3)
Entry |
Journal of the American Ceramic Society, vol. 73, No. 7, "Application of Zinc Oxide Varistors" by Tapan Gupta, 1990. |
J. Appl. Phy. 50(4), Apr. 1979, "Theory of Conduction in ZnO Varistors" by Mahan et al. |
JP 61-43404 English Translation of Item L above; Kikuchi et al. |
Continuations (1)
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Number |
Date |
Country |
Parent |
813594 |
Mar 1997 |
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