A Huge Effect of Weak dc Electrical Fields on Grain Growth in Zirconia

Authors

  • Santonu Ghosh,

    1. Department of Materials Engineering, Indian Institute of Science, Bangalore 560-012, India
    2. Department of Mechanical Engineering, University of Colorado, Boulder, Colorado 80309-0427
    Search for more papers by this author
  • Atul H. Chokshi,

    1. Department of Materials Engineering, Indian Institute of Science, Bangalore 560-012, India
    2. Department of Mechanical Engineering, University of Colorado, Boulder, Colorado 80309-0427
    Search for more papers by this author
  • Pilhwa Lee,

    1. Department of Materials Engineering, Indian Institute of Science, Bangalore 560-012, India
    2. Department of Mechanical Engineering, University of Colorado, Boulder, Colorado 80309-0427
    Search for more papers by this author
  • Rishi Raj

    Corresponding author
    1. Department of Materials Engineering, Indian Institute of Science, Bangalore 560-012, India
    2. Department of Mechanical Engineering, University of Colorado, Boulder, Colorado 80309-0427
    Search for more papers by this author

  • F. Wakai—contributing editor

  • This research was supported by the Divison of Basic Energy Sciences at the Department of Energy under grant no: DE FG02 07ER46403, and by the Council of Scientific and Industrial Research, India.

†Author to whom correspondence should be addressed. e-mail: rishi.raj@colorado.edu

Abstract

We show that the application of a modest dc electrical field, about 4 V/cm, can significantly reduce grain growth in yttria-stabilized polycrystalline zirconia. These measurements were made by annealing samples, for 10 h at 1300°C, with and without an electrical field. The finding adds a new dimension to the role of applied electrical fields in sintering and superplasticity, phenomena that are critical to the net-shape processing of ceramics. Grain-growth retardation will considerably enhance the rates of sintering and superplasticity, leading to significant energy efficiencies in the processing of ceramics.

Ancillary