Abstract
Barium aluminates were formed by the continuous precipitation method at different values of pH. The influence of ageing process and precipitation pH on the phase composition of the precipitate after firing was found. It was showed that there is growth of the 3BaOAl 2 O 3 concentration after ageing of precipitate during 7 days. Presumably, this process is associated with a decrease in the number of crystals, increasing their size in the ageing process of precipitate and chemical processes that occur during ageing: hydrolysis, hydration, dehydration.
Highlights
Dispenser cathodes are widely used in most electronic devices
We propose to eliminate these drawbacks by the use of continuous precipitation technology at constant pH
In this paper we explored the effect of precipitation pH and ageing process on the formation of the final phase composition of the precipitate after firing
Summary
Dispenser cathodes are widely used in most electronic devices. Dispenser cathode is a cathode which is based on a porous sponge made of refractory metal. Tungsten powder is often used as the sponge material. The sponge pores are filled by the active substance to complete saturation of them. Mixture of barium oxide compounds with the acid or amphoteric oxides of some elements is the active substance. The operating principle of the cathode is based on the active substance interaction with metal of the sponge (reducing agent), thereby forming free barium, which activates the cathode
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