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Parameters Affecting Pressureless Sintering of α'-Sialons with Lanthanide Modifying Cations

Published online by Cambridge University Press:  25 February 2011

K.P.J. O'reilly ,
M. Redington ,
S. Hampshire  and
M. Leigh
K.P.J. O'reilly
Affiliation:
Materials Research Centre, University of Limerick, Ireland
M. Redington
Affiliation:
Materials Research Centre, University of Limerick, Ireland
S. Hampshire
Affiliation:
Materials Research Centre, University of Limerick, Ireland
M. Leigh
Affiliation:
De Beers Industrial Diamond Division, Shannon, Ireland
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Abstract

μ-silicon nitride forms a range of solid solution Mx(Si,Al)12(0,N)16 where x = 2 and M is Li+, Ca2+, y3+ or certain lanthanide cations. This paper reports the formation of Ln-α'-sialons by the reaction of Si3N4 with AIN and Ln2O3 where Ln=Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y. Transformation reactions of Nd, Sm, Gd, Ho, Er and Y cations occurring during liquid phase pressureless sintering are reported. The effects of the volume and viscosity of the liquid phase and the amountof secondary N-melilite on sintering are discussed.

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