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Wear mechanisms of WC-Co drill bit inserts against alumina counterface under dry friction: Part 2 — Graded WC-Co inserts

Yahiaoui, Malik and Paris, Jean-Yves and Denape, Jean and Colin, Christophe and Ther, Olivier and Dourfaye, Alfazazi Wear mechanisms of WC-Co drill bit inserts against alumina counterface under dry friction: Part 2 — Graded WC-Co inserts. (2015) International Journal of Refractory Metals and Hard Materials, 48. 65-73. ISSN 0263-4368

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Official URL: http://dx.doi.org/10.1016/j.ijrmhm.2014.07.024

Abstract

The tribological behaviour of innovative graded cemented carbide inserts were studied by using a rotary tribometer and abrasive alumina counterfaces. This work completes the study made on commercial inserts with homogeneous cobalt content. Inserts with three types of graduation processes were considered: inserts with borides WCoB phases, imbibed inserts and inserts combining both processes (i.e. inserts with reactive imbibition). Physicochemical and mechanical measurements show that the WCoB phases increase the hardness towards the active surface and the imbibition increases the insert core fracture toughness. The wear tests indicate that the boride phases lower the friction coefficient. In addition, as for the commercial inserts, cemented carbide volumes with higher cobalt content also reduce the friction coefficient. Concerning the wear results, the boride phases improve the abrasion resistance. By applying a third body approach, the WCoB phases limit the introduction of cobalt binder in the source flow, the cohesion of alumina particles in the internal flow and the formation of an abrasive paste in the contact. The imbibition process, where the cobalt migration is controlled, does not affect the wear resistance by avoiding a cobalt enrichment of the cemented carbide near the active surface.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at International Journal of Refractory Metals and Hard Materials website : http://www.sciencedirect.com/science/journal/02634368
Audience (journal):International peer-reviewed journal
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Institution:Other partners > Varel Europe (FRANCE)
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Agence Nationale de la Recherche
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Deposited On:22 Aug 2014 08:38

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