Cemented carbide compositions and applications thereof
Sintered cemented carbides are described herein exhibiting enhanced high temperature properties without dramatic losses in bending strength. In some embodiments, a sintered cemented carbide composition comprises tungsten carbide, a metallic binder phase comprising at least one metal of the iron group, and at least one solid solution carbide phase comprising tantalum (Ta) and molybdenum (Mo), wherein a value of (Mo/Ta) in the sintered cemented carbide composition is from 0.3-100, and the sintered cemented carbide composition has a transverse rupture strength of at least 4000 MPa.
1. A sintered cemented carbide composition comprising:
tungsten carbide, a metallic binder phase comprising at least one metal of the iron group, and at least one solid solution carbide phase comprising tantalum (Ta) and molybdenum (Mo), wherein a value of (Mo/Ta) in the sintered cemented carbide composition is from 0.3-100 and the sintered cemented carbide composition has a transverse rupture strength of at least 4000 MPa, wherein the metallic binder phase is present in an amount of 1-20 wt. %, Ta is present in an amount of 0.05-1.5 wt. %, Mo is present in an amount of 0.5 to 5 wt. % with the tungsten carbide being a main constituent and providing a balance of the sintered cemented carbide composition, and wherein the sintered cemented carbide composition optionally includes chromium in an amount of 0.05 to 0.5 wt. % and/or vanadium in an amount of 0.05-0.15 wt. %, and further wherein, an amount of chromium in the sintered cemented carbide composition does not exceed 0.5 wt. %.
2. The sintered cemented carbide composition of claim 1 , wherein Ta is present in an amount exceeding the solubility limit of Ta in the metallic binder phase.
3. The sintered cemented carbide composition of claim 2 , wherein the value of (Mo/Ta) is from 1 to 10.
4. The sintered cemented carbide composition of claim 2 , wherein the value of (Mo/Ta) is from 1 to 5.
5. The sintered cemented carbide composition of claim 1 , having hardness of at least 1500 HV30.
6. The sintered cemented carbide composition of claim 1 , having hardness of 1600-2000 HV30.
7. The sintered cemented carbide composition of claim 5 , wherein the transverse rupture strength is at least 4300 MPa.
8. The sintered cemented carbide composition of claim 1 , wherein the chromium is present in the composition in an amount of 0.05 to 0.5 wt. %.
9. The sintered cemented carbide composition of claim 8 , wherein the chromium is part of the solid solution carbide phase.
10. The sintered cemented carbide composition of claim 8 , wherein the chromium is present in an amount less than the tantalum.
11. The sintered cemented carbide composition of claim 1 , wherein the vanadium is present in the composition in an amount of 0.05-0.15 wt. %.
12. The sintered cemented carbide composition of claim 11 , wherein the vanadium is present in an amount less than the tantalum.
13. The sintered cemented carbide composition of claim 11 , wherein the vanadium is part of the solid solution carbide phase.
14. The sintered cemented carbide composition of claim 1 having a magnetic saturation of 75-85%.
15. The sintered cemented carbide composition of claim 14 , wherein the solid solution carbide phase precipitates as clusters.