Cemented carbide with binder phase enriched surface zone

Details Cemented carbide with binder phase enriched surface zone Cemented carbide with binder phase enriched surface zone

2005-07-05

2005-07-05

Turner, Archene (Department: 1775)

Stock material or miscellaneous articles

Composite

Of inorganic material

C051S307000, C051S309000, C428S469000, C428S472000, C428S697000, C428S699000, C428S212000

Reexamination Certificate

active

06913843

ABSTRACT:
A cutting tool insert has a cemented carbide substrate and a coating. The cemented carbide substrate includes 73-93 wt % WC, 4-12 wt % binder phase, and cubic carbide phase with a binder phase enriched surface zone essentially free of cubic carbide phase. The cubic carbide phase includes elements from the groups IVB and VB, with the Ta content on a level corresponding to a technical impurity. Inserts according to the invention exhibit favorable edge strength and thermal shock resistance.

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F. Frykholm et al., “Effect on cubic phase composition on gradient zone formation in cemented carbides”,International Journal of Refractory Metals and Hard Materials,Elsevier Science Ltd., 19 (2001), pp. 527-538.

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