| 摘要 |
Relates to a method of manufacturing ceramic capacitors having a high capacity per unit volume, in which self-supporting plastic films are manufactured from individual dispersions of ceramic raw materials and of powdery electrode metal in solutions of an organic binder, a plurality of such films being stacked into an assembly and the assembly then being subjected to a thermal treatment, whereby the organic binder is removed and both the ceramic raw materials and the electrode metal are sintered together. In the method the assembly comprising the stacked films is calendered in the plastic state to a reduced thickness still <PICT:0936442/IV(a)/1> suitable for handling, sections thereof are formed into capacitors and the thermal treatment is carried out subsequently. A suitable ceramic material dispersion consists of a mixture of BaCO3, TiO2 and MgCO3 sintered in a reducing medium and then dispersed in a solution of polystyrene and dioctylphalate in trichlorethylene. Such a composition may be used as the dielectric in conjunction with a metal dispersion containing nickel as the electrode metal. An alternative ceramic mixture consists of BaCO3 and TiO2 together with La2O3 sintered in an oxidizing medium and dispersed in a similar medium to that used before. Such a composition is suitable for use with dispersions of refractory precious metals such as palladium or platinum. Plastic films are obtained from these dispersions by evaporating the solvent, and are then stacked together, an appropriate number of dielectric films 1 (Fig. 1) intervening between two metal films 2 and 3. The stack is then calendered between metal rollers at a temperature at which the metal is sufficiently plastic. Numbers of these rolled out elements may be stacked together to form complex arrangements, contact layers applied to the sides of the stack connecting together appropriate metal layers, and the whole sintered. Rolled or flat capacitors may be finally produced.
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