Departmental Papers (MSE)

Document Type

Journal Article

Date of this Version

May 2002

Comments

Copyright The American Ceramic Society. Reprinted from Journal of the American Ceramic Society, Volume 85, Issue 5, May 2002, pages 1254-1259.

Abstract

The effect of seeding on the microstructure and mechanical properties of single-phase Y-α-SiAlON ceramics with elongated grains has been studied. Seeds of the intended α-SiAlON compositions but with different size, shape, and number of grains have been compared for their effects. The microstructure, resistance (R-curve) behavior, and Weibull modulus are strongly correlated to the number density of the seeds. The highest fracture toughness reached is ~12 MPa∙m1/2 and can be obtained with as little as 1% seeding. The thermodynamic stability of seeds has been examined and is attributed to their chemical composition.

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Date Posted: 03 December 2004

This document has been peer reviewed.