Cutting tool
AssigneeSandvik Intellectual Property AB
InventorsLeif Åkesson, Jose Luis Garcia, Kare Finneid
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Abstract
The present disclosure relates to a cutting tool of a cemented carbide substrate including WC and a binder phase having one or more of Co, Fe and Ni, wherein the cemented carbide also includes a finely dispersed eta phase of Me12C and/or Me6C carbides, where Me is one or more metals selected from W, Mo and the binder phase metals, wherein the substoichiometric carbon content in the cemented carbide is between −0.30 to −0.16 wt %. The disclosed cutting tool will achieve an improved resistance against comb cracks.
Claims12
A cutting tool comprising a cemented carbide substrate comprising WC and a binder phase including one or more of Co, Fe and Ni, wherein the cemented carbide also includes an eta phase comprising Me12C and/or Me6C carbides where Me is one or more metals selected from W, Mo and the binder phase metals and wherein a substoichiometric carbon content in the cemented carbide is between −0.30 to −0.16 wt %, wherein the eta phase distribution is the same throughout the whole cemented carbide substrate, and wherein a grain size of the eta phase is between 0.4 to 9 μm.
A method of making a cutting tool comprising cemented carbide substrate, the method comprising the steps of:
- providing powder(s) forming hard constituents comprising WC powder, wherein a grain size of the WC in the powder prior to sintering is between 0.4 to 9 μm;
- providing powder(s) selected form Co, Fe and Ni forming a binder phase;
- providing a milling liquid;
- and
- milling, drying, pressing and sintering the powders into a cemented carbide, wherein one or more of W, W2C, Mo or Mo2C is added in such amounts that a substoichiometric carbon content in the sintered cemented carbide is between −0.30 to −0.16 wt %.
Dependencies are inferred from the claim text.