Electrical Breakdown Strength of Alumina at High Temperatures

M. YOSHIMURA, H. K. BOWEN

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41 Citations (Scopus)

Abstract

The dc electrical strength of sapphire and poly crystalline alumina was studied up to 1400°C. The electrical strength was essentially identical for both materials. It was > 106 V/cm at room temperature and decreased gradually with temperature up to 900°C (2.6×105 V/ cm), then dropped rapidly to 2×104 V/cm at 1400°C for a sample thickness of ∼ 100 μm. The electrical strength decreased with the sample thickness. It was inversely proportional to the thickness for samples thicker than ∼ 600 μm at 1200°C. The breakdown behavior was explained on the basis of a thermal breakdown model.

Original languageEnglish
Pages (from-to)404-410
Number of pages7
JournalJournal of the American Ceramic Society
Volume64
Issue number7
DOIs
Publication statusPublished - 1981 Jul

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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