Departmental Papers (MSE)

Document Type

Journal Article

Date of this Version

May 2002

Abstract

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.

Comments

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

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Date Posted: 03 December 2004

This document has been peer reviewed.