Cemented carbide with binder phase enriched surface zone
AssigneeSeco Tools AB
InventorsJenni Zackrisson, Jan Qvick
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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.
Claims17
A coated cutting tool insert comprising a cemented carbide substrate and a coating, said substrate comprising WC, a binder phase, a cubic carbide phase, and a binder phase enriched surface zone essentially free of the cubic carbide phase, the substrate comprises 73-93 wt % WC, 4-12 wt % cobalt, balance cubic carbides of the elements chosen from the groups IVB and VB containing more than 0.3 wt-% Ti and more than 0.5 wt-% Nb, with a Ta content less than 0.3% by weight.
Dependencies are inferred from the claim text.