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Densification and Magnetic Properties of Fe Powder Compacts According to Heat-Treatment Conditions

Yoo Hyo-Sang, Kim Yong-Ho, Kim Cheol-Woo, Son Hyeon-Taek

Archives of Metallurgy and Materials

2023

Vol. 68, iss. 1

47--50

In this study, the effects of heat-treatment conditions of Fe powder compacts on densification, microstructure, strength and magnetic properties were investigated. The prepared Fe powder was compressed in a mold of diameter 20 mm at a pressure of 800 MPa for 30 sec. This Fe powder compact was heat-treated under different atmospheres (air and 90% Ar + 10% H2 and heat-treatment temperatures (300 and 700℃). The Fe powder compacts heat-treated in an Ar+H2 mixed gas atmosphere showed a denser microstructure and higher density than the Fe powder compacts heat-treated in an air atmosphere. Oxygen content in the heat-treatment conditions played a signiﬁcant role in the improvement of the densiﬁcation and magnetic properties.

Electrochemical study on the reactivity of Fe powders

Gálová M., Grygar T., Pikna L., Lux L.

Chemia Analityczna

2003

Vol. 48, No. 2

293-303

Fe powder is an input material for powder metallurgy. It has been investigated voltamme-trically and chronoamperometry, in a form of immobilised microparticles. The aim of this study was to show a difference between the powdered Fe properties in activated and passi-vated surface states by a proper and fast electrochemical method. Chronoamperometry at low overpotential with respect to the corrosion potential was found to be the most sensitive technique for this purpose. Pulse chronoamperometry, carried out in the potential range corresponding to the voltammetric peak, enabled one to determine the potential-dependent rate constants of the electrochemical dissolution process. The interpretation of the results included the analysis of the Tafel slopes and corrosion potentials.

Badano rozpuszczanie sproszkowanego Fe, które jest substratem w proszkowej metalurgii. Do badań zastosowano woltamperometrię i chronoamperometrię mikrocząsteczek unieruchomionych na powierzchni impregnowanej elektrody grafitowej. Celem pracy było pokazanie różnic między proszkami żelaza o zaktywowanej i spasywowanej powierzchni. Pul-sowa chronoamperometria prowadzona w całym przedziale potencjału woltamperometrycznego piku umożliwiła wyznaczenie stałych szbkości elektrochemicznego rozpuszczania proszków. Interpretacja otrzymanych danych jest zgodna z krzywą Tafela i potencjałami korozji.