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Sintering Kinetics of a MgAl 2 O 4 Spinel Doped with LiF
Author(s) -
Rozenburg Keith,
Reimanis Ivar E.,
Kleebe HansJoachim,
Cook Ron L.
Publication year - 2008
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.1551-2916.2007.02185.x
Subject(s) - sintering , spinel , materials science , kinetics , doping , hot pressing , analytical chemistry (journal) , mineralogy , phase (matter) , metallurgy , chemical engineering , chemistry , physics , optoelectronics , organic chemistry , chromatography , quantum mechanics , engineering
The sintering kinetics of a pure magnesium aluminate spinel, MgAl 2 O 4 , and that doped with LiF were determined through the use of the master sintering curve technique developed by Su and Johnson. 20 Powders with 0%, 0.5%, and 1.0% by mass LiF were densified in a vacuum hot press under a range of unaxial pressures. After the sintering mechanisms in each temperature and pressure regime were determined, an optimized vacuum hot‐pressing schedule was formulated for spinel powders doped with 1.0% by mass of LiF. In addition to forming a transient liquid phase, the presence of LiF leads to the formation of oxygen vacancies that promote late‐stage sintering in MgAl 2 O 4 .