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Comparison of Microwave and Conventional Sintering of LHA Ceramics and Functionally Graded Alumina-LHA Ceramics

Title data

Negahdari, Zahra ; Willert-Porada, Monika:
Comparison of Microwave and Conventional Sintering of LHA Ceramics and Functionally Graded Alumina-LHA Ceramics.
In: Advances in Science and Technology. Vol. 63 (October 2010) . - pp. 332-339.
ISSN 1662-0356
DOI: https://doi.org/10.4028/www.scientific.net/AST.63.332

Abstract in another language

The low thermal conductivity of Lanthanum hexaaluminate, abbreviated as LHA, combined with high structural reliability of alumina matrix ceramics attracted our attention to develop a new functionally graded layered LHA-Al2O3-composite, with a LHA and a porosity gradient along the thickness of a bulk oxide ceramic. LHA is formed by in--situ reaction during sintering of the alumina/LHA composite. The high sintering temperature required for completion of LHA formation in LHA-rich layers causes grain growth and a degradation of mechanical strength in alumina-rich layers. Therefore, microwave hybrid heating was investigated as a method to enhance the reaction rate without excessive grain growth. Comparison of conventionally and microwave assisted sintered homogenous composite ceramics with 20--80 volume percent LHA showed that utilization of microwave heating could enhance the solid--state reaction and densification in samples containing more than 20 volume percent LHA. Enhanced microwave absorption in LHA rich layers assisted the sintering of a functionally graded composite at lower temperatures, enabling LHA formation without any abnormal grain growth in alumina rich layers.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Alumina; Composite; Functionally Graded Material (FGM); Lanthanum Hexaaluminate; Microwave Hybrid Heating
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Ehemalige Professoren > Chair Materials Processing - Univ.-Prof. Dr. Monika Willert-Porada
Research Institutions > Research Units > ZET - Zentrum für Energietechnik
Faculties
Faculties > Faculty of Engineering Science > Chair Materials Processing
Research Institutions
Research Institutions > Research Units
Faculties > Faculty of Engineering Science > Ehemalige Professoren
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 500 Natural sciences
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 04 May 2015 12:35
Last Modified: 08 May 2015 11:08
URI: https://eref.uni-bayreuth.de/id/eprint/11507