Role of Al2O3 in Sintering of Submicron Yttria-Stabilized ZrO2 Powders.

Abstract

The use of A12O3 (up to approximately 3.5 wt%) as a sintering aid to promote rapid densification of precipitated yttria (8.0 wt. %) stabilized Zirconia (YSZ) powders in the range 1100 - 1350 C, was investigated. The A12O3 was added as hydrated A1(OH) and dispersed by milling in a 60 : 40 alcohol : water solution, followed by pressing at 205 MPa. Significantly increased densification was obtained with A12O3, even below 1200 C, and optimum densification (>99.0% Th.D.) occured at 1350 C/1 hr. with 0.325 wt% A12O3. These samples exhibited enhanced electrical conductivity and larger grain size (0.3 - 0.5 micrometer). TEM microstructural observations and densification kinetic data indicated a liquid phase assisted sintering mechanism. Solid state doping of the ZrO2 by A1 was inferred from the electrical conductivity data.

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Document Details

Document Type
Technical Report
Publication Date
Dec 02, 1983
Accession Number
ADA136798

Entities

People

  • D. M. Wilson
  • R. C. Buchanan

Organizations

  • University of Illinois Urbana–Champaign

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Chemical Analysis
  • Chemistry
  • Crystals
  • Electrical Conductivity
  • Engineering
  • Grain Boundaries
  • Grain Growth
  • Grain Size
  • Illinois
  • Liquid Phases
  • Materials
  • Materials Processing
  • Materials Science
  • Mechanical Properties
  • Metallurgy
  • New Jersey
  • United States

Fields of Study

  • Materials science

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  • Materials Science and Engineering.
  • Surface Engineering/Surface Coating Technology.

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