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Mechanical Behaviour of Zirconia-Toughened Alumina Laminates with or without Y-PSZ Intermediate Layers
M.D. Barros1, P.L. Rachadel1, M.C. Fredel1, R. Janssen2, D. Hotza3
1 Department of Mechanical Engineering, Federal University of Santa Catarina (UFSC), 88040 – 900, Florianópolis, SC, Brazil
2 Institute of Advanced Ceramics, Hamburg University of Technology (TUHH), Denickestrasse 15, D-21073 Hamburg, Germany
3 Department of Chemical Engineering, Federal University of Santa Catarina (UFSC), 88040 – 900, Florianópolis, SC, Brazil
received September 21, 2017, received in revised form October 23, 2017, accepted November 15, 2017
Vol. 9, No. 1, Pages 69-78 DOI: 10.4416/JCST2017-00077
Abstract
Zirconia-toughened alumina (ZTA) laminates with 5 vol% (95A) and 30 vol% (70A) of yttria-partially stabilized zirconia (Y-PSZ), as well as laminated composites with thick ZTA layers and thin Y-PSZ layers were developed and processed by means of tape casting followed by co-firing. The addition of 5 vol% Y-PSZ led to grain refinement, higher densification and an increase in mechanical properties compared to those of pure alumina. In contrast, the addition of 30 vol% Y-PSZ refined the alumina grains and formed clusters of zirconia. However, it promoted lower densification when compared to pure alumina and 95A. Nevertheless, mechanical strength increased in the 70A composites owing to the zirconia toughening mechanism. Laminated composites with intermediate Y-PSZ layers have shown thermal residual stresses after sintering as a result of the different coefficients of thermal expansion (CTE) of the components and higher performance in mechanical behaviour owing to compressive stresses in ZTA layers and to the zirconia toughening mechanism present in Y-PSZ thin layers and in ZTA with 30 vol% thick layers.
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Keywords
ZTA, Y-PSZ, laminated composites, tape casting
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