Publication Date:
2012-04-15
Description:
Materials and processing conditions have been developed allowing co-firing of fluxed PZT-SKN materials with commercial low temperature co-fired ceramic (LTCC) tapes. Previously, Pb ( Zr 0.53 , Ti 0.47 ) O 3 – Sr (K 0.25 , Nb 0.75 ) O 3 (PZT-SKN) ceramics fluxed with 1 wt% LiBiO 2 and 1 wt% CuO addition were shown to sinter to high density at 900°C for 1 h, with a large d 33 piezoelectric coefficient of ~415 pm/V. Currently, the master sintering curve (MSC) approach has been used to study the densification behaviors of fluxed PZT-SKN and LTCC tapes. Different sintering mechanisms for fluxed PZT-SKN ceramics and LTCC materials are confirmed by analyzing the apparent activation energy ( Q a ). Using knowledge gained from MSC results, an optimized sintering profile was developed. Multilayer PZT-SKN/HL2000 (HeraLock ™ Tape, Heraeus) stacks co-fired at 900°C for 0.5 h maintain large piezoelectric coefficient (high field d 33 〉 340 pm/V). EDS analysis reveal limited interdiffusion of Pb from PZT-SKN layers in LTCC and the appearance of Al , Ca , and Si in the PZT-SKN near the PZT-SKN/LTCC interface. Further, elemental interdiffusion was not detected at the center of piezoelectric layer in PZT-SKN/LTCC multilayer ceramics and no subsequent reduction in piezoelectric coefficient d 33 was observed. Finally, a piezoelectric microbalance with mass sensitivity of 150 kHz/mg was fabricated using the materials and methods developed.
Print ISSN:
1546-542X
Electronic ISSN:
1744-7402
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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