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Surface Oxides on Gas and Water Atomized Steel Powders

Lars Nyborg (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; Eduard Hryha (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik)
Proc. of the 2012 Powder Metallurgy World Congress & Exhibition, Yokohama, Japan p. 15C-T1-8 . (2013)
[Konferensbidrag, refereegranskat]

The amount of oxides, their composition and spatial distribution within a metal 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 by a variety of methods, starting from surface-sensitive chemical analyses by X-ray photoelectron spectroscopy (XPS), Auger spectroscopy and high-resolution scanning electron microscopy (HR SEM) coupled with energy dispersive X-ray analysis (EDX). Surface oxide characteristics for water and gas atomised steel powder grades, alloyed with elements with high sensitivity to oxygen as Cr and Mn, are summarised. The dependence of surface products composition on the alloying elements content and atomisation method is described. In all cases, the metal particles are covered by heterogeneous oxide composed of particulate features of stable oxides (Cr-Mn-Si) and homogeneous iron surface oxide layer in between.

Nyckelord: atomization, surface oxide, oxide reduction.



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Denna post skapades 2013-12-03.
CPL Pubid: 188225

 

Institutioner (Chalmers)

Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik (2005-2017)

Ämnesområden

Produktion
Hållbar utveckling
Metallurgisk processteknik
Övrig teknisk materialvetenskap

Chalmers infrastruktur