Method for manufacturing a wear resistant component
A method for manufacturing a wear resistant component, includes the steps of: providing a mould defining at least a portion of the component; providing a powder mixture comprising a first powder of tungsten carbide and a second powder of a cobalt-based alloy, wherein the powder mixture comprises 30-70 vol % of the first powder of tungsten carbide and 70-30 vol % of the second powder of the cobalt-based alloy and the second powder of cobalt-based alloy comprises 20-35 wt % Cr, 0-20 wt % W, 0-15 wt % Mo, 0-10 wt % Fe, 0.05-4 wt % C and balance Co, wherein the amounts of W and Mo fulfills the requirement 4<W+Mo<20; filling the mould with the powder mixture; and subjecting the mould to Hot Isostatic Pressing (HIP) at a predetermined temperature, a predetermined isostatic pressure and for a predetermined time so that the particles of the powder mixture bond metallurgically to each other.
1. A method for manufacturing a wear resistant component, comprising the steps of:
providing a mould defining at least a portion of the component;
providing a powder mixture including a first powder of tungsten carbide particles (WC) and a second powder of a cobalt-based alloy, wherein the powder mixture comprises 30-70 vol % of the first powder of tungsten carbide particles (WC) and 70-30 vol % of the second powder of the cobalt-based alloy and the second powder of cobalt-based alloy comprises 20-35 wt % Cr, 0-20 wt % W, 0-15 wt % Mo, 0-10 wt % Fe, 0.05-4 wt % C and balance Co, wherein the amounts of W and Mo fulfill the requirement 4<W+Mo<20;
filling the mould with the powder mixture; and
subjecting the mould to Hot Isostatic Pressing (HIP) at a predetermined temperature, a predetermined isostatic pressure and for a predetermined time so that the particles of the powder mixture bond metallurgically to each other,
wherein particles in the powder mixture have a size in a range of 50-250 μm and a mean size of particles of the second powder of cobalt-based alloy is less than ⅙ of a mean size of particles of the first powder of tungsten carbide particles (WC), and
wherein the predetermined temperature is 70-200° C. below the melting point of the cobalt based alloy and wherein the predetermined isostatic pressure is >500 bar.
2. The method according to claim 1 , wherein the cobalt-based alloy comprises 14-16 wt % W.
3. The method according to claim 1 , wherein the cobalt-based alloy comprises 27 wt % Cr, 14 wt % W, 0 wt % Mo, 9 wt % Fe, 3.3 wt % C and balance Co.
4. The method according to claim 1 , wherein the cobalt-based alloy comprises 27-31 wt % Cr, 13-16 wt % Mo, 0 wt % W, 0-10 wt % Fe, 3.2-3.5 wt % C and balance Co.
5. The method according to claim 1 , wherein the amounts of W and Mo fulfill the requirement 5<W+Mo<20.
6. The method according to claim 1 , wherein the cobalt-based alloy comprises 26-30 wt % Cr, 4-8 wt % Mo, 0-8 wt % W, 0-1.7 wt % C and balance Co.
7. The method according to claim 6 , wherein the cobalt based alloy comprises 26-29 wt % Cr, 4.5-6 wt % Mo, 0.25-0.35 wt % C and balance Co.
8. The method according to claim 7 , wherein the amounts of W and Mo fulfill the requirement 4<W+Mo<16.
9. The method according to claim 6 , wherein the amounts of W and Mo fulfill the requirement 4<W+Mo<16.
10. The method according to claim 1 , wherein the predetermined time is 1-5 hours.
11. The method according to claim 1 , wherein the predetermined temperature is 100-150° C. below the melting point of the cobalt based alloy.
12. The method according to claim 1 , wherein the predetermined time is 1-3 hours.
13. The method of claim 1 , wherein the first powder and the second powder of the powder mixture have been blended to a homogenous powder mixture prior to filling the mould.
14. The method of claim 1 , wherein at least a portion of the component has an isotropic microstructure and comprises carbides in sizes from 1-4 μm dispersed in a matrix of cobalt based alloy.
15. The method of claim 1 , wherein the manufactured wear component has isotropic microstructure and isotropic properties.
16. The method of claim 1 , wherein tungsten carbide particles of the first powder are spherical shaped.
17. The method of claim 1 , wherein tungsten carbide particles of the first powder are facetted shaped.
18. The method according to claim 1 , wherein the predetermined isostatic pressure is 900-1200 bar.
19. The method of claim 1 , wherein the predetermined temperature is 100-200 ° C. below the melting point of the cobalt based alloy.
20. A method for manufacturing a wear resistant component, comprising the steps of:
providing a mould defining at least a portion of the component;
providing a powder mixture including a first powder of tungsten carbide particles (WC) and a second powder of a cobalt-based alloy;
filling the mould with the powder mixture; and
subjecting the mould to Hot Isostatic Pressing (HIP) at a predetermined temperature, a predetermined isostatic pressure and for a predetermined time so that the particles of the powder mixture bond metallurgically to each other,
wherein the powder mixture has 30 vol % of the first powder of tungsten carbide particles (WC) and 70 vol % of the second powder of cobalt-based alloy
wherein the second powder of cobalt-based alloy comprises 20-35 wt % Cr, 0-20 wt % W, 0-15 wt % Mo, 0-10 wt % Fe, 0.05-4 wt % C and balance Co, and the amounts of W and Mo fulfill the requirement 4<W+Mo<20,
wherein particle sizes for the first powder of tungsten carbide particles (WC) are 100-200 μm and particle sizes for the second powder of cobalt-based alloy are 45-95 μm, and
wherein the predetermined temperature is 70-200° C. below the melting point of the cobalt based alloy and wherein the predetermined isostatic pressure is >500 bar.
21. The method according to claim 20 , wherein the cobalt-based alloy comprises 14-16 wt% W.
22. The method according to claim 20 , wherein the cobalt-based alloy comprises 27 wt% Cr, 14 wt% W, 0 wt% Mo, 9 wt% Fe, 3.3 wt% C and balance Co.
23. The method according to claim 20 , wherein the cobalt-based alloy comprises 27-31 wt% Cr, 13-16 wt% Mo, 0 wt% W, 0-10 wt% Fe, 3.2-3.5 wt% C and balance Co.
24. The method according to claim 20 , wherein the amounts of W and Mo fulfill the requirement 5 <W+Mo < 20 .
25. The method according to claim 20 , wherein the cobalt-based alloy comprises 26-30 wt% Cr, 4-8wt% Mo, 0-8 wt% W, 0-1.7 wt% C and balance Co.
26. The method according to claim 25 , wherein the cobalt based alloy comprises 26-29 wt% Cr, 4.5-6 wt% Mo, 0.25-0.35 wt% C and balance Co.
27. The method according to claim 26 , wherein the amounts of W and Mo fulfill the requirement 4 <W+Mo <16.
28. The method according to claim 25 , wherein the amounts of W and Mo fulfill the requirement 4 <W+Mo <16.
29. The method according to claim 20 , wherein the predetermined time is 1-5 hours.
30. The method according to claim 20 , wherein the predetermined temperature is 100-150 ° C. below the melting point of the cobalt based alloy.
31. The method according to claim 20 , wherein the predetermined time is 1-3 hours.
32. The method according to claim 20 , wherein the predetermined isostatic pressure is 900-1200 bar.
33. The method of claim 20 , wherein the predetermined temperature is 100- 200 ° C. below the melting point of the cobalt based alloy.
34. The method of claim 20 , wherein the first powder and the second powder of the powder mixture have been blended to a homogenous powder mixture prior to filling the mould.
35. The method of claim 20 , wherein at least a portion of the component has an isotropic microstructure and comprises carbides in sizes from 1-4 μm dispersed in a matrix of cobalt based alloy.
36. The method of claim 20 , wherein the manufactured wear component has isotropic microstructure and isotropic properties.
37. The method of claim 20 , wherein tungsten carbide particles of the first powder are spherical shaped.
38. The method of claim 20 , wherein tungsten carbide particles of the first powder are facetted shaped.