Member, the American Ceramic Society
Processing-Related Fracture Origins: II, Agglomerate Motion and Cracklike Internal Surfaces Caused by Differential Sintering
Article first published online: 2 JUN 2006
Journal of the American Ceramic Society
Volume 66, Issue 6, pages 398–406, June 1983
How to Cite
LANGE, F. F. and METCALF, M. (1983), Processing-Related Fracture Origins: II, Agglomerate Motion and Cracklike Internal Surfaces Caused by Differential Sintering. Journal of the American Ceramic Society, 66: 398–406. doi: 10.1111/j.1151-2916.1983.tb10069.x
Supported by the Air Force Office of Scientific Research under Contract No. F49620-81-0036.
- Issue published online: 2 JUN 2006
- Article first published online: 2 JUN 2006
- Received April 5, 1982; revised copy received November 29, 1982; approved January 25, 1983.
Effects of differential sintering kinetics due to differential green density were studied by fabricating agglomerate-powder matrix specimens from two Al2O3/ZrO2 (30 vol%) powders and subjecting them to a cyclic sintering schedule to allow intermittent observations. Low-green-density compacts sintered faster than high-density compacts, although high-green-density compacts reached end-point densities first. Specimens containing low-green-density agglomerates produced circumferential cracklike voids at the agglomerate/matrix interface. Agglomerates with a higher green density than the matrix were subjected to compressive strains by the matrix to produce agglomerate motion when the resulting stress field was non-symmetric. Such agglomerates also produced a variety of cracklike separations. Implications regarding sintering kinetics and end-point densities are discussed. Implications regarding strength of sintered bodies are obvious, viz. strength can be proportional to the square root of the agglomerate size.