研究目的
To develop lead‐free piezoelectric multilayer actuators with large strain and high fatigue resistance for practical applications.
研究成果
The NBT–BT–3AN lead‐free piezoelectric MLAs exhibit promising potential for industrial applications, delivering large strain and high displacement at relatively low driving voltages, with excellent cycling stability and good temperature stability.
研究不足
The study notes that the dielectric constant of the multilayer actuator is significantly smaller than that of bulk ceramics, mainly due to higher porosity and difficulty in accurately determining the active area. Additionally, the strain of MLAs is smaller compared to bulk ceramics due to internal residual stress and mechanical constraints.
1：Experimental Design and Method Selection:
The study involved the fabrication of lead‐free piezoelectric multilayer actuators using tape‐casting and co‐firing techniques with Pt inner electrodes. The focus was on investigating microstructures, dielectric properties, and strain behavior under various electric fields.
2：Sample Selection and Data Sources:
The samples were prepared from 0.91(Na1/2Bi1/2)TiO3–0.06BaTiO3–0.03AgNbO3 (NBT‐BT–3AN) lead‐free incipient piezoceramics. Bulk ceramics and multilayer actuators were compared.
3：91(Na1/2Bi1/2)TiO3–06BaTiO3–03AgNbO3 (NBT‐BT–3AN) lead‐free incipient piezoceramics. Bulk ceramics and multilayer actuators were compared.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Used materials include Bi2O3, Na2CO3, Ag2CO3, BaCO3, Nb2O5, and TiO2. Equipment includes an impedance analyzer (HP 4192A) and a commercial aixPES setup for measuring electric field‐induced strain and polarization hysteresis loops.
4：Equipment includes an impedance analyzer (HP 4192A) and a commercial aixPES setup for measuring electric field‐induced strain and polarization hysteresis loops.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The process involved ball milling, calcination, pressing into green bodies, sintering, and then fabricating MLAs by tape‐casting, screen‐printing electrodes, laminating, and co‐firing.
5：Data Analysis Methods:
The dielectric permittivity and tangent loss were measured. The electric field‐induced strain and polarization hysteresis loops were analyzed to evaluate performance.
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