The ceramic MgAl{sub}2O{sub}4-based humidity sensors 1: the influence of dispersion and grain dimension of the ceramic humidity sensors from the mixture of MgO and Al{sub}2O{sub}3 on their operation characteristics

摘要

The influence of miscibility-milling, compaction and sintering on the operation characteristics ceramic humidity sensors on the base of the mixture of powders MgO and Al{sub}2O{sub}3 (50:50 at.%) with various specific surfaces is studied. It isestablished that 4 day is the optimal time of miscibility-milling lists powders when the specific surface is increased by a factor of four fold. The increase of the miscibility-milling time to 6 day causes the agglomeration of particles and the decreaseof the specific surface and operation characteristics of ceramic humidity sensors. It is established that the specific surface and operation characteristics of ceramic humidity sensors depend weakly of compacting pressure and essentially of sinteringtemperature but the temperature increase up to 1400℃causes the lowering of the characteristics above. Thus, the optimal conditions of the production the high work characteristics of ceramic humidity sensors is miscibility-milling of 4 day, compactingpressure of 300-400 MPa and sintering at 1200-1300℃.