Effectiveness of reducing agents during sintering of Cr-prealloyed PM steels
Artikel i vetenskaplig tidskrift, 2014

Development of strong inter-particle necks requires successful removal of surface oxides, present on the powder particles, during the initial stages of sintering. In the case of water-atomised powder prealloyed with chromium, the surface oxide consists mainly of an iron oxide layer with some more stable fine particulate oxides. The formation of sufficiently strong inter-particle necks requires as a minimum full removal of the iron surface oxide layer. This can be achieved by gaseous reducing agents (e.g. H2, CO or a mixture of both) or by carbon, typically admixed in the form of graphite. The reducing power of various sintering atmospheres (active gas content #10 vol.-%) and their combined effect with graphite has been investigated by a thermal analysis technique. Results indicate that a combination of a dry hydrogen containing atmosphere and fine graphite allows successful sintering of chromium alloyed PM steels.

oxide reduction

carbothermal reduction

sintering atmosphere

Cr-alloyed PM steel


Eduard Hryha

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Lars Nyborg

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Powder Metallurgy

0032-5899 (ISSN) 1743-2901 (eISSN)

Vol. 57 4 245-250


Hållbar utveckling




Annan materialteknik

Metallurgi och metalliska material



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