Cutting tools

Abstract

The present invention relates to a cutting tool comprising a cemented carbide base material, wherein the cemented carbide comprises WC particles, η-phase particles, Co, Cr, and at least one of Ti, Ta, V, and Nb.

Claims

1. A cutting tool comprising a cemented carbide base material, wherein the cemented carbide comprises WC particles, η-phase particles, and a metal binder, the metal binder comprises Co and Cr, the Co content in the cemented carbide is 6 to 18% by weight, the Cr / Co weight ratio in the cemented carbide is 2% to 12%, the η-phase content in the cemented carbide is 1 to 10% by volume, the average particle size of the η-phase particles is 0.5 to 5 μm, and the cemented carbide further comprises one or more of Ti, Ta, Nb, and V such that the Ti / Co weight ratio is ≤0.3%, the Ta / Co weight ratio is ≤1.0%, the Nb / Co weight ratio is ≤0.5%, and the V / Co weight ratio is ≤5.0%, and the weight ratio (Ti + Ta + Nb + V) / Co is ≥0.04%.

2. The cutting tool according to claim 1, wherein the Co content in the cemented carbide is 10 to 15% by weight.

3. The cutting tool according to claim 1 or 2, wherein the Cr / Co weight ratio in the cemented carbide is 2% to 10%.

4. The cutting tool according to any one of claims 1 to 3, wherein the η-phase content is 1 to 9 volume percent.

5. The cutting tool according to any one of claims 1 to 4, wherein the average particle size of the η-phase particles is 1 to 3 μm.

6. The cutting tool according to any one of claims 1 to 5, wherein the particle size of the WC is 0.3 to 3 μm.

7. A cutting tool according to any one of claims 1 to 6, wherein the cemented carbide consists of WC particles, η-phase particles, and a metal binder, and the cemented carbide consists of the elements W, C, Co, Cr, Ta, and Nb, with a Ta / Co ratio of 0.20 to 0.40% and an Nb / Co weight ratio of 0.10 to 0.20%.

8. The cutting tool according to any one of claims 1 to 7, wherein the cemented carbide consists of WC particles, η-phase particles, and a metal binder, and the cemented carbide consists of the elements W, C, Co, Cr, and Ti, with a Ti / Co weight ratio of 0.10 to 0.20%.

9. The cutting tool according to any one of claims 1 to 8, wherein the cemented carbide does not contain a γ phase.

10. The cutting tool according to any one of claims 1 to 9, wherein the cemented carbide comprises 75 to 85 volume percent of WC particles, 1 to 10 volume percent of η-phase particles, and the remaining volume percent of a metal binder.

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