METHOD OF MAKING A CEMENTED CARBIDE

The present invention relates to a method of making a cemented carbide comprising mixing in a slurry a first powder fraction and a second powder fraction subjecting the slurry to milling drying pressing and sintering. The first powder fraction is made from cemented carbide scrap recycled using the Z...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: SJÖDAHL NINA, GARCIA JOSE, NORGREN SUSANNE, HEDIN ANDREAS
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:The present invention relates to a method of making a cemented carbide comprising mixing in a slurry a first powder fraction and a second powder fraction subjecting the slurry to milling drying pressing and sintering. The first powder fraction is made from cemented carbide scrap recycled using the Zn recovery process comprising the elements W C Co and at least one or more of Ta Ti Nb Cr Zr Hf and Mo and the second powder fraction comprising virgin raw materials of WC and possibly carbides and/or carbonitrides of one or more of Cr Zr W Ta Ti Hf and Nb. The first powder fraction is subjected to a pre milling step prior to the step of forming the slurry to obtain an average grain size of between 0.2 ?? 1.5 µm.