Improved piezoelectric s for hydrophone applications based on calcium-modified lead titanate/poly(vinylidene fluoride) composites

摘要: Abstract Piezoelectric composites comprising dispersions of free-flowing calcium-modified lead titanate powders in a poly(vinyiidene fluoride) matrix have been developed and characterized as materials for hydrophone applications. We find that these provide highly desirable properties: (1) high figures merit, g h d =50(±5) × 10 −13 m 2 N −1 , relatively low dielectric loss tangent, less than 0.018; (2) convenient melt processibility; (3) no significant sensitivity changes going to pressures (14 MPa or kpsi); (4) thermal stability the poled state months at 100 °C; (5) easy fabrication. This performance results from material choices special ceramic powder processing composite preparation methods optimize achievable degree poling, remanent polarization, transfer mechanical energy dispersed ceramic. Materials design concepts, processing, device construction evaluation are described.