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- Title
Synthesis and Densification of Transparent Magnesium Aluminate Spinel by SPS Processing.
- Authors
Meir, Shay; Kalabukhov, Sergei; Froumin, Natasha; Dariel, Moshe P.; Frage, Nahum
- Abstract
Mixtures of elementary oxides, MgO–Al2O3, were used to fabricate transparent polycrystalline magnesium aluminate spinel specimens by means of the spark plasma sintering technique. A sintering aid, 1 wt% of LiF, was added to the mixed powder. The presence of the additive promotes the synthesis of spinel that starts at 900°C and is completed at 1100°C. The LiF additive wets spinel on its melting and promotes densification, which is completed at 1600°C. LiF vapor plays a cardinal role in eliminating residual carbon contamination and in the fully dense state, allows attaining a 78% level of optical transmittance. The optimal conditions for achieving adequate transparency were determined and the role of the LiF addition in the various stages of the process is discussed.
- Subjects
PHYSICS research; PHYSICAL &; theoretical chemistry; MAGNESIUM; OXIDES; POWDER metallurgy; ISOSTATIC pressing; SINTERING; SPINEL; SURFACE chemistry
- Publication
Journal of the American Ceramic Society, 2009, Vol 92, Issue 2, p358
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1551-2916.2008.02893.x