Gradient cemented carbide with alternative binder
AssigneeAB Sandvik Coromant
InventorsVeronica COLLADO CIPRES, Jose Luis GARCIA
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Abstract
A cemented carbide having an eta phase and a Ni—Al binder is provided. The binder includes intermetallic γ′-Ni3Al-precipitates embedded in a substitutional solid solution matrix including Al and Ni. Further, the cemented carbide has a surface zone free from eta phase. A method of making a cutting tool is also provided.
Claims15
A cutting tool comprising a cemented carbide substrate comprising tungsten carbide and 3 to 20 wt % binder and wherein the binder includes intermetallic γ′-Ni3Al-precipitates embedded in a substitutional solid solution matrix including Al and Ni with a weight ratio Al/Ni of between 0.02 and 0.15, wherein a total amount of Ni and Al is between 70 to 95 wt % of the binder and wherein the cemented carbide includes an inner part and a gradient surface zone with a depth of between 5 and 400 μm wherein the inner part includes eta phase in an amount so that a volume fraction eta phase is between 1 and 30 vol % and wherein the gradient surface zone is free from eta phase.
Dependencies are inferred from the claim text.