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Surface Analysis of Prealloyed Steel Powders: Qualitative and Quantitative Aspects

Eduard Hryha (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Lars Nyborg (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; C Gierl ; H. Danninger ; Sven Bengtsson
World Powder Metallurgy Congress and Exhibition, World PM 2010; Florence; Italy; 10 October 2010 through 14 October 2010 Vol. 1 (2010), p. 25-32.
[Konferensbidrag, refereegranskat]

The amount of oxides, and their composition and spatial distribution within a particle, determine the usefulness and subsequent processing requirements of a powder. The present work summarizes possibilities of qualitative and quantitative analysis of powder surface chemistry and its changes during sintering by a variety of methods, starting from surface-sensitive chemical analyses by XPS, Auger spectroscopy, HR SEM+EDX analysis etc. Utilizing modern thermoanalytical techniques such as DTA, DSC and TG combined with continuous chemical analysis through mass-spectroscopy allows identification of temperature ranges within which degassing and deoxidation of powder occur. The aim of this study was to establish a relationship between the surface composition of the powder and the type and extent of surface chemical reactions during degassing and deoxidation studied by thermoanalytical techniques performed on the same material. A number of water-atomized powders prealloyed with manganese (0.3-1.8%) were chosen as model materials for which qualitative and quantitative analysis of oxides is presented.

Nyckelord: PM steels, manganese alloying, surface oxides, XPS analysis, thermal analysis, mass-spectroscopy, carbothermal reduction

Denna post skapades 2010-11-15. Senast ändrad 2016-05-13.
CPL Pubid: 129110