Surface Oxides on Gas and Water Atomized Steel Powders
Paper i proceeding, 2014

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

surface oxide

oxide reduction

particulate oxide features

Atomization

Författare

Lars Nyborg

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Eduard Hryha

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Advances in Powder Metallurgy & Particulate Materials-2014

Vol. 2 2153-2161

Drivkrafter

Hållbar utveckling

Styrkeområden

Produktion

Ämneskategorier

Annan materialteknik

Metallurgi och metalliska material

ISBN

978-0-9853397-6-0