Surface characterisation of fine inert-gas- and water-atomised stainless steel 316L powders - formation of thermodynamically unstable surface oxide phases
2013 (English)In: Powder Metallurgy, ISSN 0032-5899, Vol. 56, no 2, 158-163 p.Article in journal (Refereed) Published
New insights are presented on the speciation of surface oxide phases on fine inert gas atomised (GA, <45 and <4 mu m) and water atomised (WA, <45 mu m) stainless steel AISI 316L powders. X-ray photoelectron and Auger electron spectroscopy, scanning electron microscopy, Raman spectroscopy, and cyclic voltammetry were applied for the characterisation. Oxidised manganese was strongly enriched in the outermost surface oxide of the GA powders (13 and 47 wt-%), an effect increasing with reduced particle size. Manganese and sulphur were enriched in oxide nanoparticles on the surface. Oxidised silicon (59 wt-%) was enriched on the WA powder surface. Tri-or tetravalent manganese oxides were observed on the GA particles in addition to alpha-Fe2O3, and Cr2O3. The oxide of the WA powder revealed in addition the likely presence of a silicate rich phase, mainly consisting of tetravalent Si, di- and/or trivalent Fe, and hexavalent Cr, which was confirmed not present as chromate.
Place, publisher, year, edition, pages
2013. Vol. 56, no 2, 158-163 p.
Stainless steel, Powder, Gas atomisation, Water atomisation, Surface characterisation, Oxide
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-105515DOI: 10.1179/1743290112Y.0000000041ISI: 000318021100025ScopusID: 2-s2.0-84877910584OAI: oai:DiVA.org:kth-105515DiVA: diva2:571299
FunderSwedish Research CouncilFormas
QC 201306042012-11-222012-11-222013-06-04Bibliographically approved