| 摘要 |
<p>PURPOSE:To obtain a homogeneous sintered body having no defect in structure by using tricobalt tetroxide containing not more than 10mol% cobalt oxide as a cobalt raw material and a substance including not more than 1000ppm iron as an impurity. CONSTITUTION:Water and an organic binder are added to a raw material containing zinc oxide as a principal ingredient, cobalt as a by-component and bismuth oxide, antimony oxide, etc., as additives, and mixed. The mixture is granulated, molded, heated and pre-baked, thus manufacturing a base material. A sintered body is acquired from the base material, and electrodes are formed onto both surfaces of the sintered body. Tricobalt tetroxide including not more than 10mol% cobalt oxide and a substance containing not more than 1000ppm iron as an impurity are employed as cobalt raw materials at that time. Consequently, oxygen is also fed from the inside of the base material in a sintering process, and a normal reaction progresses both on the inside and outside of the base material. Accordingly, the homogeneous sintered body having no defect in structure is obtained.</p> |
