Characterization of surface oxides on water-atomized steel powder by XPS/AES depth profiling and nano-scale lateral surface analysis
Artikel i vetenskaplig tidskrift, 2013

Characterization of oxide products on the surface of water-atomized steel powder is essential in order to determine the reducing conditions required for their removal during the sintering stage which in turn will result in improved mechanical properties. Pre-alloyed powder with 3 wt% Cr and 0.5 wt% Mo was chosen as the model material. Investigation of the powder surface characteristics with regard to composition, morphology, size and distribution of surface oxides was performed using X-ray photoelectron spectroscopy, Auger electron spectroscopy and high resolution scanning electron microscopy combined with X-ray microanalysis. The analysis revealed that the powder is covered by a homogeneous (similar to 6 nm thick) Fe-oxide layer to similar to 94% whereas the rest is covered by fine particulate features with the size below 500 nm. These particulates were further analyzed and were divided into three main categories (i) Cr-based oxides with simultaneous presence of nitrogen, (ii) Si-based oxides of "hemispherical" shape and (iii) agglomerates of the afore mentioned oxides.

Water atomized powder

Alloyed sintered steels

Depth profiling

Surface oxides

HR SEM plus EDX analysis

XPS/AES analysis

Surface coverage

Författare

Dimitris Chasoglou

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Eduard Hryha

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Mats Norell

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Lars Nyborg

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Applied Surface Science

0169-4332 (ISSN)

Vol. 268 496-506

Drivkrafter

Hållbar utveckling

Styrkeområden

Produktion

Ämneskategorier

Kemi

DOI

10.1016/j.apsusc.2012.12.155