Oxidation behaviour of a Mo(Si,Al)2 based composite at 1500 degrees C
Journal article, 2011
The oxidation of a Mo(Si,Al)(2) composite is investigated at 1500 degrees C in dry air using exposure times from 1 to 1000 h. Cross sections are examined with Scanning Electron Microscopy (SEM) and the phase composition is analyzed by X-ray diffraction (XRD). The material forms a continuous and protective alumina layer, the growth of the alumina layer following parabolic kinetics. Immediately below the scale Mo(Si,Al)(2) is replaced by a Mo(5)(Si,Al)(3) layer due to the flux of aluminum to the scale. The Al concentration in the Mo(Si,Al)(2) phase in the underlying substrate decreases from 27% before exposure to 16-17% after 1000 h. The continuous alumina layer becomes covered by a top layer consisting of alumina grains embedded in a viscous melt with approximate composition 7 Na(2)O-15 Al(2)O(3)-78 SiO(2). With time, sodium is volatilized from the melt and the top scale layer transforms to a mixture of alumina, mullite and silica melt.
Multiphase intermetallics
Microstructure
v7
Molybdenum silicides
mosi2
molybdenum
resistance
Electron microscopy
al
1992
intermediate
p2747
kamey cg
(mo
disilicide
silicides
high-temperature oxidation
w)si-2-based composite
atmospheres
Oxidation
scanning
intermetallic alloys
Author
Linda Ingemarsson
Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry
Kristina M Hellström
Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry
Lars-Gunnar Johansson
Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry
Jan-Erik Svensson
Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry
Mats Halvarsson
Chalmers, Applied Physics, Microscopy and Microanalysis
Intermetallics
0966-9795 (ISSN)
Vol. 19 9 1319-1329Subject Categories
Materials Engineering
DOI
10.1016/j.intermet.2011.05.002