Departmental Papers (MSE)

Document Type

Journal Article

Date of this Version

July 2002

Abstract

The effect of heating schedule on microstructure and fracture resistance has been investigated in single-phase Nd-, Y-, and Yb-α-SiAlON. Such effect is strongly system dependent, reflecting the strong influence of phase stability on α-SiAON nucleation and the amount of transient/residual liquid during processing. The addition of 1% of α-SiAlON seeds to the starting powders nearly completely obliterates such effect, while it simultaneously improves microstructure homogeneity and fracture resistance. SENB toughness of 7 MPa∙m1/2 and peak R-curve toughness of ~11 MPa∙m1/2 have been obtained for seeded Y-α-SiAlON ceramics using heating rates from 1oC/min to 25oC/min.

Comments

Copyright The American Ceramic Society. Reprinted from Journal of the American Ceramic Society, Volume 85, Issue 7, July 2002, pages 1882-1884.

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Date Posted: 03 December 2004

This document has been peer reviewed.