| 摘要 |
<p>PURPOSE: To enhance nonlinearity of voltage, limited voltage ratio characteristics and surge current resisting characteristics by a method wherein the electrode material, containing lead borosilicate glass, which contains a specific quantity of tellurium oxide, in silver paste, is printed and baked on zinc oxide varistor. CONSTITUTION: As the electrode material for zinc oxide varistor, lead borosilicate glass, containing 0.1 to 30.0wt.% tellurium oxide in terms of TeO2 , is contained in silver paste. To be more precise, the prescribed quantity (5.0% by weight) of lead borosilicate glass powder is weighed, this powder and Ag powder (65.0% by weight) are mixed into a vehicle (30.0% by weight) which is formed by adding dissolved ethyl cellusose to butyl carbitol, and the electrode material for the zinc oxide varistor is manufactured. Then, the electrode material for the zinc oxide varistor is screen-printed on both surfaces of a zinc oxide varistor sintered body (13mm in diameter and 1.5mm in width) in such a manner that diameter of 10mm is obtained, baked at 800 deg.C for ten minutes, and an electrode is formed. As a result, limited voltage ratio characteristics and characteristics of nonlinear voltage, etc., can be improved.</p> |
