Fabrication of porous graded piezoelectric ceramics by tape casting (Abstract/Poster in convegno)

Type
Label
  • Fabrication of porous graded piezoelectric ceramics by tape casting (Abstract/Poster in convegno) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Mercadelli E., Sanson A., Pinasco P., Roncari E., Galassi C. (2008)
    Fabrication of porous graded piezoelectric ceramics by tape casting
    in Electroceramics XI, Manchester
    (literal)
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  • Mercadelli E., Sanson A., Pinasco P., Roncari E., Galassi C. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • Lead Zirconate Titanate (PZT) is one of the most widely studied material for ultrasonic transducer applications. The production of a porous piezoceramic allows to decrease the acoustical impedance, thus improving transfer of acoustical energy to water or biological tissues. A porous graded structure allows to match the need of an high response to a good compatibility with the investigated material. Tape casting is the most commonly used technique for the production of multilayer ceramics. Casting, lamination, debonding and sintering are necessary steps for the fabrication of multilayered ceramic packages with this technique, so any variations in those processes affect the final product. In this work each of those steps was thoroughly investigated to produce a FGM of PZT-Nb for ultrasonic applications. Among the pore formers available, carbon black (CB) was considered the most suitable one. Slurry formulations with different CB content were optimized to produce green sheets. Linear correlations were found between CB and solvent, binder, plasticizers content. In the lamination process, pressure, temperature and time, are variables strongly dependent on the properties of the green sheet and that influence the sintering behaviour of the green body. This study shows that the lamination conditions can be optimized by tailoring the binder to plasticizer volume ratio of each stacked green layer. Finally by gradually increasing CB content and adjusting the binder burnout procedure, cracks and delaminations were eliminated, thus leading to a well developed and controlled microstructure with porosity ranging from 0 to 30 vol%, suitable for ultrasonic applications. (literal)
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  • Institute of Science and Technology for Ceramics, National Research Council, Faenza, Italy (literal)
Titolo
  • Fabrication of porous graded piezoelectric ceramics by tape casting (literal)
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