| 摘要 |
PURPOSE:To obtain an electrostrictive element which is large in elongation rate and low in dielectric constant by a method wherein it is formed of a ceramic in prescribed chemical composition, and ceramic powder larger than a specific value in specific surface area is sintered at a specific temperature or below into the ceramic concerned. CONSTITUTION:The chemical composition of ceramic is represented by a formula, its specific surface area is 3.5m<2>/g or above, and ceramic is sintered at a temperature of 1175 deg.C or below. If ceramic powder is smaller than 3.5m<2>/g in specific surface area, it is furthermore ground. A ball mill, a CF mill, a vibration mill, or an attritor can be used as a grinding mill. It is preferable that ceramic powder ranges from 3.5 to 10m<2>/g in specific surface area. If ceramic powder is smaller than 3.5m<2>/g in specific surface area, it can be sintered at a temperature of 1175 deg.C or below. If ceramic powder exceeds 10m<2>/g in specific surface area, it grows too fine, and a usual handling can not cope with it, in result an electrostrictive element formed of the ceramic powder concerned can not stably possessed of a prescribed performance. |
