Soft magnetic iron-cobalt-based alloy and method for its production
View Patent ↗Disclosed are soft magnetic alloys that consist essentially of 10% by weight ≦Co≦22% by weight, 0% by weight ≦V≦4% by weight, 1.5% by weight ≦Cr≦5% by weight, 1% by weight ≦Mn≦2% by weight, 0% by weight ≦Mo≦1% by weight, 0.5% by weight ≦Si≦1.5% by weight, 0.1% by weight ≦Al≦1.0% by weight, rest iron. Also disclosed are methods of making the alloys, and products containing them, such as actuator systems, electric motors, and the like.
1. A soft magnetic alloy, consisting essentially of components given by the following ranges:
10% by weight≦Co≦22% by weight,
0% by weight≦V≦4% by weight,
1.5% by weight≦Cr≦5% by weight,
1% by weight≦Mn≦2% by weight,
0% by weight≦Mo≦1% by weight,
0.5% by weight≦Si≦1.5% by weight,
0.1% by weight≦Al≦1.0% by weight, and
the balance iron
wherein the chromium plus manganese plus molybdenum plus aluminum plus silicon plus vanadium content is given by the range 4.0% by weight≦Cr+Mn+Mo+Al +Si+V≦9% by weight.
2. The soft magnetic alloy according to claim 1 ,
wherein the cobalt content is given by the range 14% by weight≦Co≦22% by weight.
3. The soft magnetic alloy according to claim 2 ,
wherein the cobalt content is given by the range 14% by weight≦Co≦20% by weight.
4. The soft magnetic alloy according to claim 1 , wherein the vanadium content is given by the range 0% by weight≦V≦2% by weight.
5. The soft magnetic alloy according to claim 1 , wherein the molybdenum content is given by the range 0% by weight≦Mo≦0.5% by weight.
6. The soft magnetic alloy according to claim 1 , wherein the manganese content is given by the range of 1.25% by weight≦Mn≦1.5% by weight.
7. The soft magnetic alloy according to claim 1 , wherein the silicon content is given by the range 0.5% by weight≦Si≦1.0% by weight.
8. The soft magnetic alloy according to claim 1 , wherein the aluminium plus silicon content is given by the range 0.6% by weight≦Al+Si≦2% by weight.
9. A soft magnetic alloy, consisting essentially of components given by the following ranges:
10% by weight≦Co≦22% by weight,
0% by weight≦V≦2.0% by weight,
1.6% by weight≦Cr≦2.5% by weight,
1.25% by weight≦Mn≦1.5% by weight,
0% by weight≦Mo≦0.02% by weight,
0.6% by weight≦Si≦0.9% by weight,
0.2% by weight≦Al≦0.7% by weight, and
the balance iron.
10. A soft magnetic alloy, consisting essentially of components given by the following ranges:
10% by weight≦Co≦22% by weight,
0% by weight≦V≦0.01% by weight,
2.3% by weight≦Cr≦3.0% by weight,
1.25% by weight≦Mn≦1.5% by weight,
0.75% by weight≦Mo≦1% by weight,
0.6% by weight≦Si≦0.9% by weight,
0.1% by weight≦Al≦0.2% by weight, and
the balance iron.
11. A soft magnetic alloy consisting essentially of given by the following ranges:
10% by weight≦Co≦22% by weight,
0.75% by weight≦V≦2.75% by weight,
2.3% by weight≦Cr≦3.5% by weight,
1.25% by weight≦Mn≦1.5% by weight,
0% by weight≦Mo≦0.01% by weight,
0.6% by weight≦Si≦0.9% by weight,
0.7% by weight≦Al≦1.0% by weight, and
the balance iron.
12. The soft magnetic alloy according to claim 1 , wherein after finish-annealing the alloy has an elongation A L >2% in a tensile test.
13. The soft magnetic alloy according to claim 1 , wherein after finish-annealing the alloy has an elongation A L >20% in a tensile test.
14. The soft magnetic alloy according to claim 1 , wherein the alloy has a resistivity ρ>0.50 μΩm.
15. The soft magnetic alloy according claim 14 , wherein the alloy has a resistivity ρ>0.55 μΩm.
16. The soft magnetic alloy according to claim 15 , wherein the alloy has a resistivity ρ>0.60 μΩm.
17. The soft magnetic alloy according to claim 16 , wherein the alloy has a resistivity ρ>0.65 μΩm.
18. The soft magnetic alloy according to claim 1 , wherein the alloy has a yield point R p0.2 >340 MPa.
19. The soft magnetic alloy according to claim 1 , wherein the alloy has a saturation J(400 A/cm) >1.90 T.
20. The soft magnetic alloy according to claim 19 , wherein the alloy has a saturation J(400 A/cm) >2.00 T.
21. The soft magnetic alloy according to claim 1 , wherein the alloy has a coercitive field strength H c <3.5 A/cm.
22. The soft magnetic alloy according to claim 21 , wherein the alloy has a coercitive field strength H c <2.0 A/cm.
23. The soft magnetic alloy according to claim 1 , wherein the alloy has a maximum permeability μ max >1000.
24. The soft magnetic alloy according to claim 23 , wherein the alloy has a maximum permeability μ max >2000.
25. A soft magnetic core for an electromagnetic actuator, comprising an alloy according to claim 1 .
26. The soft magnetic core of claim 25 , wherein the electromagnetic actuator is a solenoid valve of an internal combustion engine.
27. The soft magnetic core of claim 25 , wherein the electromagnetic actuator is a fuel injector of an internal combustion engine.
28. The soft magnetic core of claim 27 , wherein the electromagnetic actuator is a direct injector of a spark ignition engine.
29. The soft magnetic core of claim 27 , wherein the electromagnetic actuator is a direct injector of a diesel engine.
30. A fuel injector of an internal combustion engine, comprising at least one component comprising a soft magnetic alloy according to claim 1 .
31. The fuel injector according to claim 30 , wherein the fuel injector is a direct injector of a spark ignition engine.
32. The fuel injector according to claim 30 , wherein the fuel injector is a direct injector of a diesel engine.
33. A soft magnetic rotor for an electric motor, comprising an alloy according to claim 1 .
34. A soft magnetic stator for an electric motor, comprising an alloy according to claim 1 .
35. An electric motor comprising a soft magnetic stator or a soft magnetic rotor comprising an alloy according to claim 1 .
36. A soft magnetic component for an electromagnetic valve control on an inlet valve or an outlet valve an engine compartment, comprising an alloy according to claim 1 .
37. A yoke part for an electromagnetic actuator, comprising an alloy according to claim 1 .
38. The yoke part according to claim 37 , wherein the electromagnetic actuator comprises a solenoid valve.
39. An electromagnetic actuator comprising a core or yoke part comprising an alloy according to claim 1 .
40. An electromagnetic valve control, comprising a soft magnetic component comprising an alloy according to claim 1 .
41. The alloy according to claim 1 , wherein the amounts of nitrogen, carbon, and oxygen impurities are 200 ppm or less, 400 ppm or less, and 100 ppm or less, respectively.