METHOD FOR MANUFACTURING NONLINEAR VOLTAGE RESISTOR AND LIGHTNING ELEMENT FORMED OF NONLINEAR VOLTAGE RESISTOR

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a nonlinear voltage resistor which has high sintered density and small crystal grain size, and to provide a lightning element formed of the nonlinear voltage resistor, which has high V_1mA/t and excellent electrical characteristics such as V-I characteristics and capacitance.;SOLUTION: The nonlinear voltage resistor is manufactured by the steps of: previously preparing a powder of an oxide by mixing at least a powder of zinc oxide (ZnO), a powder of a cobalt (Co) compound and a powder of an antimony (Sb) compound, reacting the mixture at a heating temperature of 950-1,350C to produce the oxide containing Zn_7-xCo_xSb₂O₁₂(0x7), which becomes a grain-growth inhibitor, and pulverizing the oxide; adding the powder of the oxide containing the grain-growth inhibitor as an additive to the powder of the zinc oxide (ZnO) that is a main component and a well-known additive powder made of a compound and mixing them; pressure-molding the mixture in a mold; and then sintering the molded body. The lightning element formed of the nonlinear voltage resistor is formed by providing high insulating layers at side faces and electrodes at the upper face and the lower face of the nonlinear voltage resistor.;COPYRIGHT: (C)2012,JPO&INPIT