Affordable Access

Publisher Website

Constrained sintering kinetics of 3YSZ films

Authors
Journal
Journal of the European Ceramic Society
0955-2219
Publisher
Elsevier
Publication Date
Volume
31
Issue
13
Identifiers
DOI: 10.1016/j.jeurceramsoc.2011.05.044
Keywords
  • Sintering
  • Films
  • Zro2
  • Fuel Cells
  • Porosity

Abstract

Abstract 3YSZ green layers approximately 10 μm thick were screen-printed onto 3YSZ substrates and their constrained sintering kinetics were measured at 1100–1350 °C using an optical dilatometer. The densification rates of the same powder in the form of pellets and free-standing films were also measured. The constrained densification rate was greatly retarded compared with the free densification rate at a given temperature and density. The retardation increased with increasing density and temperature and could not be properly accounted for by existing theories of constrained sintering. As a result the apparent activation energy is much lower for constrained sintering (135 ± 20 kJ mol −1) than for free sintering (660 ± 30 kJ mol −1). It is proposed that this is because the constrained microstructure exhibits larger and more widely separated pores at the higher temperatures.

There are no comments yet on this publication. Be the first to share your thoughts.