Varistor and method of producing the same
AssigneeTDK Corporation
InventorsDai Matsuoka, Yo Saito
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Abstract
A varistor has a varistor element body, and an external electrode disposed on the varistor element body. The varistor element body contains ZnO as a principal component, and a rare-earth metal. The external electrode has an electrode layer. The electrode layer is formed on an external surface of the varistor element body by simultaneous firing with the varistor element body. The electrode layer contains Pd.
Claims9
A varistor comprising a varistor element body, and an external electrode disposed on the varistor element body,
- wherein the varistor element body comprises ZnO as a principal component, and a rare-earth metal, and
- wherein the external electrode comprises an electrode layer formed on an external surface of the varistor element body by simultaneous firing with the varistor element body, and comprising Pd.
A varistor comprising a varistor element body, and an external electrode disposed on the varistor element body,
- wherein the varistor element body comprises ZnO as a principal component, and a rare-earth metal,
- wherein the external electrode comprises an electrode layer disposed on an external surface of the varistor element body, and comprising Pd, and
- wherein a compound of the rare-earth metal in the varistor element body and Pd in the electrode layer exists near an interface between the varistor element body and the external electrode.
A method of producing a varistor comprising a varistor element body, and an external electrode having an electrode layer disposed on an external surface of the varistor element body, said method comprising:
- a step of forming a green body comprising ZnO as a principal component, and a rare-earth metal;
- a step of applying an electroconductive paste comprising Pd, onto an external surface of the green body;
- and
- a step of firing the green body with the electroconductive paste thereon, to obtain the varistor element body and the electrode layer.
Dependencies are inferred from the claim text.