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HomeMaterials Science ForumMaterials Science Forum Vols. 798-799Low Temperature Phase Transformation Study in the...

Low Temperature Phase Transformation Study in the Al₂O₃-Y₂O₃-Nb₂O₅ System

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Abstract:

The mechanical properties and creep resistance of the Al₂O₃ have been improved with the use of other oxide ceramics, among these the Y₃Al₅O₁₂ (YAG - "yttrium aluminum garnet"), to obtain the Al₂O₃-YAG composite. The aim of this work is to study the effect of addition of Nb₂O₅ at low sintering temperatures of the composite, starting from the eutectic composition Al₂O₃-Y₂O₃. In this work, the compositions were produced by powder mixtures of Al₂O₃-Y₂O₃ and Al₂O₃-Y₂O₃-Nb₂O₅ using high energy ball milling. The green bodies were pressed at 70 MPa and sintered at 1000, 1100, 1200 and 1300°C for 2 h. The materials were characterized by shrinkage and X-Ray Diffraction (XRD) using the Rietveld method. The presence of Nb₂O₅ does not show any improve neither for the YAG phase formation nor for the shrinkage of the sintered samples in the temperature range studied.

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Brazilian Ceramic Conference 57

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Periodical:

Materials Science Forum (Volumes 798-799)

Pages:

90-94

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.798-799.90

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Online since:

June 2014

Authors:

Eduardo de Sousa Lima*, A.P.O. Santos, R.F. Cabral, J.I.N. Fortini, Jose B. de Campos

Keywords:

Composite Al₂O₃-YAG, Nb₂O₅, Sintering

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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