DIRECTORATE OF NON-LANGUAGE SPANISH AND MANUFACTURING PROCEDURE

摘要

A ceramic resistor with a nonlinear voltage dependency comprising a ZnO-based sinter containing at least one rare earth element oxide, cobalt oxide, chromium oxide, at least one Group IIIb element oxide, at least one Group Ia element oxide, 0.01-2 at.% (in terms of Ca) of calcium oxide and 0.001-0.5 at.% (in terms of Si) of silicon oxide and having the atomic ratio of calcium to silicon ranging from 0.2 to 20, preferably from 2 to 6. Since this element has the above-specified atomic ratio (Ca/Si), it has an extremely long service life even under high-temperature and high-humidity conditions. Further it is reduced in the deterioration of asymmetry of the current-voltage relationship due to a difference in the direction of applying a direct current. When 0.05-10 at.% (in terms of Mg) of magnesium oxide is further added to the above composition, the above effects can be further enhanced and the grain growth is inhibited even when firing is conducted at a high temperature, with the result that the leakage current is reduced. IMAGE