| 摘要 |
<p>PURPOSE:To provide a resistor having a good nonlinear characteristic by adding a dispersive of ammonium polyacrylate to a mixture of water, zinc oxide based powder, and an additive for providing voltage-dependent nonlinearity. CONSTITUTION:A mixture of powder is prepared of predetermined mol% ZnO and Bi2O3 and predetermined mol% CoO, MnO and Sb2O3. The mixture and water are put in a ball mill in a manner that it contains a predetermined mol% solid component. This mixture is mixed with aqueous ammonium polyacrylate such that the solid components of the two have a predetermined proportion in percent by weight. Binder and lubricant is added and mixed for a predetermined time. The slurry thus prepared is dried and pulverized by a spray dryer to form a compact having a predetermined diameter and thickness. The compact is baked in the air to remove the additives such as dispersive, binder and lubricant, and then prebaked. This material is coated with a substance, which will be a coating of high resistance, and sintered at 1200 deg.C in the air. The sinter is ground at both surfaces, and it is heated again at 500 deg.C and provided with aluminum electrodes by flame spraying.</p> |
