Processing of textured zinc oxide varistors via templated grain growth

Suvaci E., Ozer I.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, cilt.25, sa.9, ss.1663-1673, 2005 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 25 Sayı: 9
  • Basım Tarihi: 2005
  • Doi Numarası: 10.1016/j.jeurceramsoc.2004.05.026
  • Dergi Adı: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1663-1673
  • Anahtar Kelimeler: ZnO, varistors, grain growth, microstructure-final, texturing, BISMUTH TITANATE, SILICON-NITRIDE, MICROSTRUCTURAL DEVELOPMENT, ELECTRICAL-PROPERTIES, CERAMICS, ZNO, ALUMINA, ORIENTATION, FABRICATION, FILMS
  • Anadolu Üniversitesi Adresli: Hayır

Özet

Textured, dense zinc oxide varistors were successfully fabricated by Templated Grain Growth (TGG) technique. Rod-like, anisotropic ZnO particles (templates) were synthesized by homogeneous precipitation method. The templates are aligned in such a position where c-axes of the templates are parallel to the tape casting direction during the modified tape casting process. Since zinc oxide varistors are liquid phase sintered, addition of the templates to initial powder mixture does not result in constrained densification. The aligned zinc oxide templates grow anisotropically during sintering. (11 (2) over bar0) and (10 (1) over bar0) prismatic planes of the ZnO crystals (templates) grow faster than the other ZnO crystal planes. The growth of the templates results in texture development in zinc oxide varistors. As sintering temperature increases, fraction of textured grains in the microstructure increases. A template growth mechanism is also proposed for texturing zinc oxide varistors by TGG. (c) 2004 Elsevier Ltd. All rights reserved.