ISSN:
1573-4889
Keywords:
Oxidation
;
silicon
;
molybdenum
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The oxidation mechanism of Fe-5Cr-15Ni-2Si-4.5Mo alloy was investigated in order to determine the role of Si and Mo in providing oxidation resistance. It was determined that the oxidation protection in the temperature range 750–950°C resulted from formation of a continuous oxide sublayer of SiO 2 (or possibly Fe 2 SiO 4).Molybdenum formed an intermetallic Fe 2 Mo 1−x Si x that eventually diffused out into the grain boundaries and formed a protective barrier to the oxidation process. The mechanism behind the improved oxidation is the formation of a SiO 2 layer at the metal-oxide interface that retards the outward diffusion of Fe. It was also established that the oxidation mechanism was controlled by an activation energy equal to that of Fe 3+ ions diffusing through SiO 2.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00656706
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