Surface Analysis of Prealloyed Steel Powders: Qualitative and Quantitative Aspects
Paper in proceedings, 2010

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.

XPS analysis

mass-spectroscopy

manganese alloying

surface oxides

thermal analysis

carbothermal reduction

PM steels

Author

Eduard Hryha

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Lars Nyborg

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Christian Gierl

Vienna University of Technology

Herbert Danninger

Vienna University of Technology

Sven Bengtsson

Höganäs

World Powder Metallurgy Congress and Exhibition, World PM 2010; Florence; Italy; 10 October 2010 through 14 October 2010

Vol. 1 25-32

Subject Categories

Manufacturing, Surface and Joining Technology

Other Materials Engineering

ISBN

978-189907219-4

More information

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8/1/2018 3