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Deterioration in the Final‐Stage Sintering of Magnesium Aluminate Spinel
Author(s) -
Ting ChingJui,
Lu HongYang
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01436.x
Subject(s) - spinel , sintering , stage (stratigraphy) , materials science , aluminate , magnesium , metallurgy , mineralogy , chemistry , geology , cement , paleontology
Sintering of magnesium aluminate spinel of the MgO‐excess, stoichiometric, and Al 2 O 3 ‐excess compositions has been investigated under vacuum and in air for the effect of low oxygen partial pressures. Densification enhancement of the surface layer is due to MgO evaporation which generates oxygen vacancies in the host crystal lattice. Regions of different grain sizes are observed from samples sintered under both conditions. Microstructural features of pairwise breakup of particle chains representing differential sintering are characteristic of the less‐densified sample interior. The densification improved initially and yet was retarded in the intermediate sintering stage when the density exceeded 75% with vacuum‐sintering owing to MgO evaporation.