| 摘要 |
<p>PROBLEM TO BE SOLVED: To greatly reduce the grain resistance of a sintered block and the limit voltage by sintering it in a neutral or weak reductive atmosphere until the atmosphere changes to an oxidative atmosphere in a temp. step of the cooling process of the baking. SOLUTION: In a voltage nonlinear resistor manufacturing method, zinc oxide being a main component is mixed with an additive contg. at least bismuth oxide, formed and baked. Only a temp. step of the cooling process of the baking is conducted in an oxidative atmosphere and ranges from 900 deg.C to 600 deg.C with a temp. width of at least 100 deg.C. This temp. step within the range of 900-600 deg.C takes at least one hr. and the temp. descending rate in the cooling process of the baking is 100 deg.C/hr. or less. The oxygen partial pressure in the oxidative atmosphere is 0.15atm. or more.</p> |
