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Aluminum Infiltration into Molybdenum Silicide Preforms
Author(s) -
Bhattacharya Anup K.,
Bhaskaran T. A.,
Ramasesha Sheela K.
Publication year - 2002
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.1151-2916.2002.tb00461.x
Subject(s) - aluminium , molybdenum , infiltration (hvac) , materials science , silicide , metallurgy , silicon , activation energy , composite material , chemistry , organic chemistry
The presence of Mo 5 Si 3 in MoSi 2 preforms hinders the reactive infiltration of aluminum. To understand the role of Mo 5 Si 3 , the kinetics of aluminum infiltration into pure Mo 5 Si 3 is studied. Irrespective of the initial composition (MoSi 2 or Mo 5 Si 3 ) of the preform, the final product always contains Mo(Al,Si) 2 . However, the aluminum content in the two cases is different: when the preform is MoSi 2 , the aluminum content is 14–18 at.%, and, when the preform is Mo 5 Si 3 , the aluminum content is 25–27 at.%. The activation energy for the reactive infiltration of aluminum into the Mo 5 Si 3 preform is ∼26 kJ/mol.