圧電積層アクチュエーターの耐久性向上

概要

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A study of durability test was performed using a piezoelectric stack actuator having various values of Q_m, T_c, E_c and bending strength. The high bending strength but low E_c stack showed a decrease of displacement and appeared cracks which occurred at the edge of positive side of PZT pellet and grown to the center of diameter and negative side. Cyclic domain rotation at high temperature is considered the reason of this slow crack growth, never mean brittle fracture for ceramics. The decomposed pellets from the high E_c but low Q_m stack appeared deterioration of k_p. The increase of temperature of low Q_m stack was higher than that of high Q_m stack for a starting temperature of 120℃ with 130 Hz drive. It is considered that low self-heating is caused by a small domain rotation introduced by more addition of the acceptor element. The result of this small self-heating, therefore, 2 % deterioration in displacement was observed in high Q_m and T_c stack. The change of current-voltage properties of the high Q_m and T_c stack appeared to be small compared with the low Q_m and T_c stack. The increase of current properties is considered because of the repeated domain rotation or displacement hysteresis loop in the low Q_m and T_c sample. It appears that Q_m and T_c values have a strong influence on durability in addition of E_c and bending strength.
社団法人日本セラミックス協会の論文
1999-05-01