Abstract: The variations of parameters of piezoelectric ceramics Fe1.5 and corresponding high power transmitting transducers with the logarithm of time have been examined separately with normal specimens and a certain type of vibrator under defined temperatures (room temperatures, 60℃ and 100℃), pressure (30 kg/cm²) and electrical power densities (0.3W/cm³·KC and 0.5W/cm³·KC) in this paper. Experimental results show that the causes of aging of ε₃₃^T and k_p are not all the same. The varying tendency of the properties of ceramic elements after the cumulative action of the electrical power density of 0.3W/KC·cm³ is different from that of the normal specimens under each single condition. Both the value of k_p and ε₃₃^T are some what increased. It was considered that this aging behaviour was related to the internal bias electrical field of the ceramic material selves.
We would conclude that the aging of properties of piezoceramics under the given temperature, pressure and electrical power density is not serious enough to cause the deterioration of performances of transducer. The appropriate heat treatment will be favourable to stabilizing the performances of ceramic materials and transducers.