Departmental Papers (MSE)

Document Type

Journal Article

Date of this Version

July 2002

Comments

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

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.

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Date Posted: 03 December 2004

This document has been peer reviewed.