| 摘要 |
A lead-free piezoelectric ceramic based on (Na,K,Li)NbO3 containing BiO3 is provided to have improved reproducibility and physical properties including high density, dielectric and piezoelectric properties by adding constant content of Bi2O3 to material of the ceramic. The method for preparing the piezoelectric ceramics has the steps of: preparing oxide source powder after weighing to obtain the (Na,K,Li)NbO3 based ceramics; uniformly blending the source powder and grinding the blended powder; calcining the prepared powder at 850deg.C in an alumina based melting pot for 5 hours after drying the pulverized powder; again mixing, grinding and drying the calcined powder; adding PVA as a binder to the dried powder then press molding the mixture; and heating the formed material to evaporate the binder then sintering the treated material. The piezoelectric ceramics contains 0.2wt.% of Bi2O3.
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