Interparticle Neck Connections in Innovative Insulated Iron Powder Compounds
Paper i proceeding, 2015

Goal of the present paper is the analysis of the interparticle neck connections in a system made of insulated iron powder compounds with different additions of an Al-Mg-Si-Cu alloy (0.25, 0.5 and 0.75 wt%). The introduction of the aluminium alloy powder has been made in order to improve the mechanical properties, evaluated as the transverse rupture strength, without decreasing the agnetic properties (evaluated in terms of iron loss and coercivity force). The fracture analysis of investigated systems puts into evidence the breaking of interparticle neck connections. Heat treatment (at the temperature of 500C) contributes to the early stages of interparticle neck developments. The chosen aluminium alloy presents a sort of pre-sintering behaviour at 500C, with the possibility of mass-transport processes around the insulated iron powder compounds. The air heat treatment applied aims at providing an increase in the mechanical behaviour of the material, with a final good rigidity after the cooling process. Fracture surfaces and transverse rupture strength values show that, at 500 MPa, the strength and the area related to the inter-particle necks can be correlated to the occasional broken insulated point-to-point surfaces that hinder the development of inter-particles necks.


Robert Bidulsky

Technical University of Kosice

J. Bidulska

Technical University of Kosice

Raquel De Oro Calderón

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Eduard Hryha

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Marco Maccarini

Consorzio Prometeo

Illaria Forno

Consorzio Prometeo

Marco Actis Grande

Politecnico di Torino

Acta Physica Polonica A

0587-4246 (ISSN)

Vol. 128 4 647-650

International Symposium on Physics of Materials (ISPMA13)
Prag, Czech Republic,


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Metallurgi och metalliska material

Kompositmaterial och -teknik



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