Durability of Piezoelectric Ceramics for an Actuator

概要

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Change of piezoelectric properties with the number of loading cycles was measured under various driving conditions, i.e., temperature, preset pressure and driving voltage. Although ε^T_<33>/ε_0 changed very little, K_p. decreased markedly. K_p decrease is affected by driving condition factors, i.e., minus voltage, preset pressure and temperature, in that order. By optimal arrangement of these factors, K_p decrease could be reduced considerably. K_p decrease is mainly due to 90° switching of the domain. Improvement of mechanical strength for the piezoelectric material is effective both for the suppression of microcrack occurrence and for prevention of K_p decrease. We found that microcrack occurrence caused domain switching. We suggest a deterioration mechanism for piezoelectric ceramics.
社団法人応用物理学会の論文
1992-09-30