Journal
CERAMICS INTERNATIONAL
Volume 45, Issue 3, Pages 3570-3573Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.11.016
Keywords
Piezoelectric properties; Lead-free ceramics; Microstructure; Thermal spray
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Funding
- Singapore Maritime Institute, under Maritime Sustainability RD Programme [SMI-2015-MA-07 (IMRE/16-7P1125)]
- Asset Integrity & Risk Management (AIM) RD Programme [SMI-2015-OF-01 (IMRE/15-9P1115)]
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The microstructure of Bi-0.5(Na0.70K0.20Li0.10)(0.5)TiO3 (BNKLT) coatings fabricated by thermal spray method was closely examined by TEM, revealing the coexistence of rhombohedral and tetragonal perovskite main phases, and very minor secondary phases, while all amorphous phase was crystallized after heat treatment. Obtaining coexisting rhombohedral and tetragonal perovskite phases after the thermal spray process involving the melting-recrystallization and heat treatment process resulted in piezoelectric ceramic coating with excellent electrical and electromechanical properties. The effective piezoelectric coefficient d(33) of the heat-treated BNKLT coating reached 86 pm/V with substrate clamping, measured over macroscale by laser scanning vibrometer.
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