Investigation of mechanical strength of the functionally graded zirconia-mullite/alumina ceramics tailored for high temperature applications

Functionally graded ceramic material composed of zirconia-mullit/alumina (FGZM/A) was developed for advanced high temperature and engineering applications. The concept of functionally graded ceramics is expected to provide better long-term performance and success based on production of smooth graded...

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Bibliographic Details
Published in:Materials research express 2019-04, Vol.6 (7), p.75516
Main Authors: Besisa, Dina H A, Ewais, Emad Mohamed M
Format: Article
Language:English
Subjects:
Densification
Flexural strength
Functionally graded zirconia-mullite/alumina (FGZM/A)
MgO
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Summary:Functionally graded ceramic material composed of zirconia-mullit/alumina (FGZM/A) was developed for advanced high temperature and engineering applications. The concept of functionally graded ceramics is expected to provide better long-term performance and success based on production of smooth graded profile and improved mechanical properties. It was found that, inspection of the mechanical properties behavior of the FGM is significant to the ultimate product and design. So that, in this work, flexural strength of the functionally graded zirconia-mullit/alumina produced by pressureless sintering was investigated. Magnesium oxide was added with various content (0, 1.0 and 1.5 wt % MgO) in an attempt to improve the density and flexural strength of the proposed system. The flexural strength distribution in the FGZM/A was obtained from the mechanical testing of the bulk FGC structure at different positions through the whole structure. The experimental results released that, the distribution of the flexural strength is strongly dependent on the variation of compositions, microstructure, toughening mechanism, type and amount of the formed liquid phases. Flexural strength of FGZM/A declares homogeneous and graded distribution from one layer to the other. The proposed FGZM/A can be strongly nominated for high temperature and tribological applications.
ISSN:2053-1591
2053-1591
DOI:10.1088/2053-1591/ab177e