| 摘要 |
To activate metallic sintered iron electrodes, ammonium halogenides are suitable as activating means, mixed with the iron powder right from the start, if appropriate together with conductive graphite and an organic pore forming substancesuch as polyvinyl alcohol. They begin to function while still in the paste, and during drying, as well as in the early stages of the sintering process. This can be extended up to two hours at temperatures which are close below the decomposition temperature of the ammonium halogenides (300 DEG -350 DEG C.). After volatilization of the ammonium halogenide, the sintering is completed at the terminal temperature of, for example, 700 DEG C. for one hour and cooling is then performed in an H2 atmosphere down to room temperature. |
