Materials Transactions Online

Materials Transactions, Vol.52 No.04 (2011) pp.685-690
© 2011 The Japan Institute of Metals

Microstructural Aspects during the Preparation of Y3Al5O12 by Combustion Synthesis and Temperature Field Simulation

Yuepeng Song1,2, Jiangtao Li3, Yixiang Chen3, Wenwen Ji2, Chong Soo Lee1 and Hyoung Seop Kim1

1Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea
2Mechanical and Electronic Engineering College, Shandong Agricultural University, Tai'an Shandong 271018, P. R. China
3Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China

The combustion front quenching method (CFQM) combined with the temperature field simulated using the finite element method was used to investigate the microstructural aspects of the fabrication of transparent Y3Al5O12 via combustion synthesis. The simulated results indicate that there are three regions corresponding with the temperature distribution whose microstructural aspects were studied. The composite mixtures of the products cannot be separated depending only on their gravities. The filamentous profile of aluminum along with many aluminous intermediate products are detected by XRD, SEM and EDS analysis in the preheat region, which indicates that the heat-transfer can affect the mass-transfer process and the subsequent reaction process. The microstructural aspects show that the combustion reaction of the Al/NiO/Y2O3 powder mixture was initiated by the melting of Al particles.

(Received 2010/10/5; Accepted 2011/1/24; Published 2011/3/30)

Keywords: bulk Y3Al5O12 (YAG), microstructural aspects, combustion front quenching method (CFQM), combustion synthesis, temperature distribution simulation

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