Direct-write fabrication of zinc oxide varistors

Valeria Tohver, Sherry L. Morissette, Jennifer A. Lewis, Bruce A. Tuttle, James A. Voigt, Duane B. Dimos

Research output: Contribution to journalArticlepeer-review

Abstract

Zinc oxide (ZnO)-based pastes with tailored rheological properties have been developed for direct-write fabrication of thick-film varistor elements in highly integrated, multifunctional electroceramic devices. Such pastes exhibited pseudo-plastic behavior with a low shear apparent viscosity of roughly 1 × 104 Pa·s. Upon aging, the pastes attained printable, steady-state viscosities of approximately 3 × 102 Pa·s at 10 s-1. Square and rectangular elements were patterned on dense alumina substrates and sintered at varying temperatures between 800° and 1250°C. Varistor elements fired at 900°C exhibited nonlinearity coefficients (α = 30) that were equivalent to high-density (>95%) varistors formed by cold isostatic pressing at 100 MPa (15 ksi) of a similar chemically derived powder heat-treated under analogous conditions.

Original languageEnglish (US)
Pages (from-to)123-128
Number of pages6
JournalJournal of the American Ceramic Society
Volume85
Issue number1
StatePublished - Jan 2002
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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