Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
ZnO-BASED VARISTOR THICK FILMS PREPARED BY TAPE CASTING WITH NON-LINEAR BEHAVIOURCOMPARABLE TO BULK VARISTORS
Year:2007
Research Areas
  • Ceramics,
  • Magnetic materials
Information
Abstract
Thick films of ZnO-based varistors have been prepared by tape casting technology. This technique lets obtain dense thick films with high microstructural homogeneity and therefore reliability and reproducibility in the electrical response. The manufacture of varistor thick films with electrical response comparable to bulk varistor shows a critical problem; the excessive volatilization of Bi2O3 during sintering step at high temperature, due to the exaggerated area-volume ratio of these devices. Consequence of Bi2O3 volatilization, the electrical response of thick film sintered at high temperature is very far from the electrical response of bulk ceramics. If the sintering of thick films at high temperature is carry out in Bi-rich atmosphere, the electrical response obtained is comparable to bulk ceramics, with high values of non-linear coefficient (a ~ 40) and very low density current ( J < 0.01mA/cm2). This result is innovative in the preparation of varistor like thick film.
International
Si
Congress
EC07-ELECTROCERAMICS
960
Place
AVEIRO (PORTUGAL)
Reviewers
No
ISBN/ISSN
Start Date
24/06/2007
End Date
26/06/2007
From page
To page
Participants
  • Autor: Amador Caballero Cuesta (UPM)
  • Autor: Jose de Frutos Vaquerizo (UPM)
  • Autor: Miguel Ángel De La Rubia López (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Propiedades ópticas, eléctricas y magnéticas de materiales y sus aplicaciones (POEMMA)
  • Departamento: Física Aplicada a las Tecnologías de la Información
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