| 摘要 |
<p>PURPOSE:To avoid the decline in varistor voltage due to intruding water content by a method wherein a varistor element after baking step is brought into contact with a reaction accelerator of unreacted material to be heated. CONSTITUTION:A ceramic sheet 1a and an inner electrode 2 are laminated to be cut off, debinder processed and chamferred. Next, the whole body is coated with an inner layer 3a of an outer electrode 3 to be reduction-baked later coated with an outer layer 3b to be heated for reoxidation. Next, a varistor element 1 is buried in a reaction accelerator to be heated at 700-850 deg.C. Through these heat treatments, unreacted material remaining in the varistor element 1 reacts with SiO2 used as a reaction accelerator to be turned into a hardly ionizable material even if it contains residual water. Through these procedures, the decline in the varistor voltage due to intrudsion water content can be avoided.</p> |
