at Google ScholarTitle 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 > Former Professors > Chair Electrochemical Process Engineering - Univ.-Prof. Dr. Monika Willert-Porada Research Institutions > Research Units > ZET - Zentrum für Energietechnik Faculties Faculties > Faculty of Engineering Science > Chair Electrochemical Process Engineering Research Institutions Research Institutions > Research Units Faculties > Faculty of Engineering Science > Former Professors |
| 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 |