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Influence of yttria and zirconia additions on spark plasma sintering of alumina composites

Published online by Cambridge University Press:  30 March 2015

Dibyendu Chakravarty  and
Atul H. Chokshi
Dibyendu Chakravarty*
Affiliation:
Center for Nanomaterials, International Advanced Research Center for Powder Metallurgy and New Materials (ARCI), Balapur P.O., Hyderabad, Telangana 500005, India; and Department of Materials Engineering, Indian Institute of Science, Bangalore, Karnataka 560012, India
Atul H. Chokshi
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore, Karnataka 560012, India
*
a)Address all correspondence to this author. e-mail: dibyenduc@arci.res.in
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Abstract

The mechanisms of densification and creep were examined during spark plasma sintering (SPS) of alumina doped with a low and high level of zirconia or yttria, over a temperature range of 1173–1573 K and stresses between 25 and 100 MPa. Large additions of yttria led clearly to in situ reactions during SPS and the formation of a yttrium-aluminum garnet phase. Dopants generally lead to a reduction in the densification rate, with substantial reductions noted in samples with ∼5.5 vol% second phase. In contrast to a stress exponent of n ∼ 1 for pure alumina, the doped aluminas displayed n ∼ 2 corresponding to an interface-controlled diffusion process. The higher activation energies in the composites are consistent with previous data on creep and changes in the interfacial energies. The results reveal a compensation effect, such that an increase in the activation energy is accompanied by a corresponding increase in the pre-exponential term for diffusion.

Keywords

spark plasma sinteringdensificationdopantsaluminacreep
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 8 , 28 April 2015 , pp. 1148 - 1156
Copyright
Copyright © Materials Research Society 2015 

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References

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