Departmental Papers (MSE)

Document Type

Journal Article

Date of this Version

May 2002


Copyright The American Ceramic Society. Reprinted from Journal of the American Ceramic Society, Volume 85, Issue 5, May 2002, pages 1260-1267.


Seeding effects on the microstructure and mechanical properties of single-phase Ca-α-SiAlON ceramics have been investigated. Whereas a small amount of seeds can transform the microstructure from one of fine equiaxed grains to one consisting of many needle-like grains, the highest fracture toughness of 8 MPa . m1/2 is not reached until 8% seeding. This contrasts with the much higher seed efficiency in Y-SiAlON, where the peak toughness is reached at 1% seeding. The difference and the general trend of mechanical properties of seeded α-SiAlONs are discussed in terms of α-SiAlON formation and toughening mechanisms.



Date Posted: 03 December 2004

This document has been peer reviewed.