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2 Archives of Metallurgy and Materials

2 2022

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Consolidation and Characterisation of Hard Metal Powders Milled under Dichloromethane

Chicinaș Horea, Jucan Ovidiu-Darius, Gădălean Rares Vasile, Conțiu Glad, Cotai Ana, Popa Catalin

Archives of Metallurgy and Materials

2022

Vol. 67, iss. 2

541--545

This work presents the development of a safer processing route for hard metals. Traditional processing of fine particles under organic solvents presents significant explosion risks. The milling under dichloromethane (DCM) reduces the risks associated with fire hazards. After milling and drying, the samples have been sintered in an industrial sintering furnace under a vacuum at 1380°C. The materials’ characterisation has been done by X-ray diffraction, scanning electron microscopy, particle size analysis, optical microscopy, and by magnetic measurements. The present work results reveal the powders’ appropriate properties after milling and drying and the desired biphasic (Co-WC) phases obtained after sintering, thus proving the feasibility of such a route, therefore the diminishing of specific fire hazards.

A Comparative Study of Nanocrystalline Fe38.5Co38.5 Nb7 P15Cu1 Alloys Obtained by Mechanical Alloying and Rapid Quenching

Cotai Ana, Miraglia Salvatore, Neamtu Bogdan Viorel, Marinca Traian Florin, Chicinaș Horea F., Isnard Olivier, Chicinaș Ionel

Archives of Metallurgy and Materials

2022

Vol. 67, iss. 2

555--561

This paper presents a comparative study of the preparation and characterisation of Fe38.5Co38.5 Nb7 P15Cu1 alloy produced by mechanical alloying (MA) and rapid quenching (RQ) method. In order to obtain the starting mixture (SS) in the present study, we opted for the replacement of elemental Nb and P powders with ferroalloy powders of niobium and phosphorus. Benzene was used as a control agent of the process (PCA) for wet MA. The samples obtained (powders and ribbons) were characterised by X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), X-ray microanalysis (EDX), magnetic measurements M(H) and thermomagnetic measurements M(T). After 40 h of wet MA, the alloy was partially amorphous, and the ribbons obtained by RQ do not show an amorphous state. Also, the magnetic measurements show the influence of the method used on the magnetic properties.