Annealing Induced Changes in Fracture Behaviour of Bulk Plasma-sprayed Alumina

  1. Prof. Dr. G. Müller
  1. R. J. Damani

Published Online: 27 APR 2006

DOI: 10.1002/3527607293.ch66

Ceramics - Processing, Reliability, Tribology and Wear, Volume 12

Ceramics - Processing, Reliability, Tribology and Wear, Volume 12

How to Cite

Damani, R. J. (2000) Annealing Induced Changes in Fracture Behaviour of Bulk Plasma-sprayed Alumina, in Ceramics - Processing, Reliability, Tribology and Wear, Volume 12 (ed G. Müller), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527607293.ch66

Editor Information

  1. Fraunhofer-Institut für Silicatforschung, Neunerplatz 2, 97082 Würzburg, Germany

Author Information

  1. Department of Structural and Functional Ceramics, University of Leoben, A-8700 Leoben, Austria

Publication History

  1. Published Online: 27 APR 2006
  2. Published Print: 27 JUN 2000

Book Series:

  1. EUROMAT 99

ISBN Information

Print ISBN: 9783527301942

Online ISBN: 9783527607297

SEARCH

Keywords:

  • ceramics;
  • bulk plasma-sprayed alumina;
  • microstructural development;
  • fracture characteristics

Summary

The microstructural development and fracture characteristics of a bulk plasma-sprayed alumina material is investigated in the as-sprayed and various annealed material conditions, using electron microscopy, and in-situ SEM fracture experiments.

Toughness increases considerably after heat treatment. The material exhibits pronounced R-curve behaviour. In the short-crack range broken splats act as frictional bridges resulting in steeply rising toughness. In the longer-crack range larger features cause a less steep, but steady rise in toughness. It is found that the fracture behaviour is governed by the alignment of splats and a intra-splat microcrack sub-structure which provides low energy crack paths. This substructure changes extensively on annealing.