Journal of Materials Science

, Volume 28, Issue 19, pp 5211–5217 | Cite as

Synthesis of ZnO-based varistor precursor powders by means of the reaction spray process

  • O. Milošević
  • D. Uskoković
  • L. J. Karanović
  • M. Tomašević-Čanović
  • M. Trontelj
Papers

Abstract

High-purity, fine-grained oxide ceramic powders that are commonly used for ZnO-based varistors were synthesized by means of the reaction spray process. Processing steps included formation of the solutions of zinc nitrate and/or certain metal additives and spraying of the solution into a heated reaction column using a two-phase nozzle. After water evaporation from the droplets, the precursor salts were decomposed at elevated temperatures (up to 1473 K) in order to obtain homogeneous oxide powders with complex compositions corresponding to the final multicomponent varistor system. The decomposition behaviour of the precursors, as well as the characteristics of the resulting powders: crystallinity, phase composition, particle shape, morphology and particle-size distribution, were examined. It was shown that the characteristics of the reaction spray-derived powders can be controlled by adjusting the system and the solutions parameters.

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Copyright information

© Chapman & Hall 1993

Authors and Affiliations

  • O. Milošević
    • 1
  • D. Uskoković
    • 1
  • L. J. Karanović
    • 2
  • M. Tomašević-Čanović
    • 3
  • M. Trontelj
    • 4
  1. 1.Instauitute of Technical Sciences of the Serbian Academy of Sciences and ArtsBelgradeYugoslavia
  2. 2.Faculty of Mining and GeologyBelgradeYugoslavia
  3. 3.Institute for Technology for Nuclear and other Mineral Raw MaterialsBelgradeYugoslavia
  4. 4.Jožef Štefan InstituteLjubljanaSlovenia

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