Effect of step sintering on breakdown voltage of varistors prepared from nanomaterials by sol gel route

Surech C. Pillai*, J. M. Kelly, D. E. McCormack, R. Ramesh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

ZnO varistor materials were prepared by a sol gel route with subsequent drying and calcination. Varistor discs fabricated from these materials were subjected to a two step sintering schedule. Therefore in a typical experiment, the samples were heated to 1000°C, then allowed to cool for over 30 min to 900°C and held there for 6 h. The results were compared with commercial varistor samples sintered in a similar way. Considerably higher breakdown voltages were obtained for the varistors made from nanosample (1192±30 V mm-1) compared with the commercial samples (723 ±30 V mm-1) sintered under the same experimental conditions. The sintered materials were characterised by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and density measurements.

Original languageEnglish
Pages (from-to)158-160
Number of pages3
JournalAdvances in Applied Ceramics
Volume105
Issue number3
DOIs
Publication statusPublished - Jun 2006
Externally publishedYes

Keywords

  • Dopants
  • Grain growth
  • Nano
  • Sintering
  • Varistors
  • ZnO

ASJC Scopus subject areas

  • Ceramics and Composites
  • Industrial and Manufacturing Engineering

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