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Surface Analysis at Different Sintering Stages of Steel Compacts with Mn and Si

Raquel Oro ; Monica Campos ; Eduard Hryha (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Lars Nyborg (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Jose Manuel Torralba
Proc. of EURO PM2011 Congress & Exhibition, 9-12 October 2011, Barcelona, Spain Vol. 1 (2011), p. 113-117.
[Konferensbidrag, refereegranskat]

The different stages of sintering have been studied for a gas atomized master alloy containing Fe-Mn- Si-C. Surface characterization and depth profiling of the master alloy powder was performed by means of XPS. In order to understand the phenomena taking place at surface of the green parts, mixes containing plain iron powder, master alloy and graphite were heated in high vacuum (10-6 mbar) at increasing temperatures (400ºC, 600ºC, 800ºC, 1000ºC) and analyzed with XPS. The conditions during the heat treatments described seem to be reducing enough to remove part of the manganese and silicon oxides present at the original surface when the annealing is performed at 800ºC and 1000ºC. However, intensive manganese evaporation was observed when heating at 1000ºC. While the amount of silicon cations on the surface decreases importantly from 800 to 1000ºC, the oxygen concentration in the surface is very similar and this might point out to a recombination of Si cations to form complex Mn-Si oxides. The Mn/Si cations ratio registered indicates that the oxide formed at 1000ºC could be the type MnSiO3.

Nyckelord: High oxygen affinity alloy elements, master alloys, Fe-Mn-Si, sintering behavior, surface oxides, oxide evolution, XPS analysis.



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Denna post skapades 2011-10-19.
CPL Pubid: 147453