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Role of different rare earth oxides on the reaction sintering of magnesium aluminate spinel
Published in Elsevier Ltd
Volume: 45
Issue: 9
Pages: 11413 - 11420
Role of three rare earth oxides, viz., La 2 O 3 , CeO 2 and Yb 2 O 3 on reaction sintering of magnesium aluminate spinel having molar ratio of MgO:Al 2 O 3 = 1:2 from its solid oxide precursors was investigated in static and dynamic heating conditions. Effect of these additives (3 wt%) on densification behavior, phase assemblage and microstructure development were studied in the temperatures of 1500–1700 °C. Yb 2 O 3 enhanced the sintering of spinel, while La 2 O 3 and CeO 2 negatively impacted the sintering of magnesium aluminate spinel which can be discerned from the shrinkage curve of TMA as well as from static firing regime. This is ascribed to the formation of secondary phases in La 2 O 3 and CeO 2 containing samples which have different crystalline structures to that of spinel. This anisotropy due to different crystallinity hindered the pore shrinkage and pore removal and thereby retarded the densification. Whereas, the cubic structure of the secondary phase formed in Yb 2 O 3 containing sample which is isotropic with the crystalline orientation of the parental spinel phase assisted the densification. © 2019
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JournalData powered by TypesetCeramics International
PublisherData powered by TypesetElsevier Ltd
Open AccessNo