The ceramic MgAl{sub}2O{sub}4-based humidity sensors. 2. A relation between the kinetic parameters of water adsorption and operating characteristics of ceramic humidity sensors in the system of gal{sub}2O{sub}4

摘要

The comparison of adsorption parameters of water vapour on the surfaces both powders and. compacts of the latter with the data for change in electrical resistance of compacts above in the media with a different concentration of water vapour iscarried out. As it is ascertained in the study of kinetic features in adsorption processes of water vapour from the air flow, the powders with smaller specific surfaces adsorb the water vapour and are saturated by it more rapidly, then the powders with abig specific surfaces, but absolute values of absorbed water on them are smaller. The value of absorbed water on the compacts is changed by such a manner. This data are consistent with the investigation of porous structure. The rate of adsorption aswellas value of absorbed water is increased with a decrease of a porous diameter, in which the condensation of water occurs quickly. On the basis of such studies it can be chosen the thecnological parameters for the use of ceramic humidity sensors.