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Study of the Processing of a Recycled WC-Co Powder: Can It Compete with Conventional WC-Co Powders?

Mégret, Alexandre; Vitry, Véronique; Delaunois, Fabienne

2021 • In Journal of Sustainable Metallurgy, 7, p. 448-458

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https://hdl.handle.net/20.500.12907/29466

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Keywords :

[en] Cemented carbides; [en] Sintering; [en] Recycled powder; [en] Milling

Abstract :

[en] Cemented carbide tools suffer from many issues due to the use of tungsten and cobalt as raw materials. Indeed, those are listed by the European Commission as 'critical raw materials' since 2011 and by the US Department of Interior as 'critical minerals' in 2018. To remain competitive with the conventional high-speed steels, less performant but cheaper, WC-Co tools can be recycled. In the present paper, a WC-7.5Co powder, recycled by the 'Coldstream' process, has been sintered with vacuum sintering. As preliminary experiments have shown that the sinterability of the powder is low, the sintering temperature was set at 1500 °C to achieve full density. In parallel, the influence of ball milling conditions (rotation speed and milling medium) on the reactivity of the recycled powder has been studied in terms of grain size distribution, hardness, and fracture toughness. The optimized milling conditions were found to be 6 h wet milling, leading to a hardness of about 1870 HV30 and a toughness of about 10.5 MPa√m after densification. The recycled powder can thus totally compete with conventional powders, opening avenues for the recycling of cemented carbide tools.

Disciplines :

Materials science & engineering

Author, co-author :

Mégret, Alexandre ; Université de Mons > Faculté Polytechnique > Service de Science des Matériaux ; Université de Mons > Faculté Polytechnique > Service de Métallurgie

Vitry, Véronique ; Université de Mons > Faculté Polytechnique > Service de Métallurgie

Delaunois, Fabienne ; Université de Mons > Faculté Polytechnique > Service de Métallurgie

Language :

English

Title :

Study of the Processing of a Recycled WC-Co Powder: Can It Compete with Conventional WC-Co Powders?

Publication date :

17 March 2021

Journal title :

Journal of Sustainable Metallurgy

ISSN :

2199-3823

eISSN :

2199-3831

Publisher :

Springer

Volume :

7

Pages :

448-458

Peer reviewed :

Peer Reviewed verified by ORBi

Research unit :

F601 - Métallurgie

Research institute :

R400 - Institut de Recherche en Science et Ingénierie des Matériaux

Available on ORBi UMONS :

since 18 March 2021

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Scopus citations^®

14

Scopus citations^®
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10

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