Soft magnetic iron-cobalt-based alloy and process for manufacturing it
View Patent ↗A soft magnetic alloy consists essentially of 10 percent by weight≦Co≦22 percent by weight, 0 percent by weight≦V≦4 percent by weight, 1.5 percent by weight≦Cr≦5 percent by weight, 0 percent by weight<Mn<1 percent by weight, 0 percent by weight≦Mo≦1 percent by weight, 0.5 percent by weight≦Si≦1.5 percent by weight, 0.1 percent by weight≦Al≦1.0 percent by weight and the remainder iron, the content of the elements chromium and manganese and molybdenum and aluminum and silicon and vanadium being 4.0 percent by weight≦(Cr+Mn+Mo+Al+Si+V)≦9.0 percent by weight.
1. A soft magnetic core for an electromagnetic actuator comprising a soft magnetic alloy consisting essentially of:
an amount of cobalt Co, such that 10 percent by weight≦Co≦22 percent by weight,
optionally an amount of vanadium V, such that 0 percent by weight≦V≦4 percent by weight,
an amount of chromium Cr, such that 1.5 percent by weight≦Cr≦5 percent by weight,
an amount of manganese Mn, such that 0.4 percent by weight≦Mn≦1 percent by weight,
optionally an amount of molybdenum Mo, such that 0 percent by weight≦Mo≦1 percent by weight,
an amount of silicon Si, such that 0.5 percent by weight≦Si≦1.5 percent by weight,
an amount of aluminum Al, such that 0.1 percent by weight≦Al≦1.0 percent by weight,
and the remainder iron, and incidental impurities of up to 200 ppm nitrogen, up to 400 ppm carbon, and up to 100 ppm oxygen,
wherein the content of the elements chromium and manganese and molybdenum and aluminium and silicon and vanadium are such that 4.0 percent by weight≦(Cr+Mn+Mo+Al+Si+V)≦9.0 percent by weight;
wherein the alloy has a specific electrical resistivity ρ>0.50 μΩm, a yield strength R p0.2 >340 MPa, a saturation J(400 A/cm)>1.00 T, a coercive field strength H c <3.5 A/cm and in its final annealed state has an elongation at rupture value of A L >2%.
2. The soft magnetic core in accordance with claim 1 , wherein 14 percent by weight≦Co≦22 percent by weight.
3. The soft magnetic core in accordance with claim 2 , wherein 14 percent by weight≦Co≦20 percent by weight.
4. The soft magnetic core in accordance with claim 1 , wherein 0 percent by weight≦V≦2 percent by weight.
5. The soft magnetic core in accordance with claim 1 , wherein 0 percent by weight<Mo<0.5 percent by weight.
6. The soft magnetic core in accordance with claim 1 , wherein the combined amounts of aluminium and silicon are such that 0.6 percent by weight≦Al+Si≦2 percent by weight.
7. The soft magnetic core in accordance with claim 1 , wherein 6.0 percent by weight≦Cr+Mn+Mo+Al+Si+V≦9.0 percent by weight.
8. The soft magnetic core in accordance with claim 1 , wherein the alloy in its final annealed state has an elongation at rupture value of A L >20% under tensile testing.
9. The soft magnetic core in accordance with claim 1 , wherein the alloy has a specific electrical resistivity of ρ>0.55 μΩm.
10. The soft magnetic core in accordance with claim 9 , wherein the alloy has a specific electrical resistivity of ρ>0.60 μΩm.
11. The soft magnetic core in accordance with claim 10 , wherein the alloy has a specific electrical resistivity of ρ>0.65 μΩm.
12. The soft magnetic core in accordance with claim 1 , wherein the alloy has a saturation at J(400 A/cm)>2.00 T.
13. The soft magnetic core in accordance with claim 1 , wherein the alloy has a coercive field strength H c of <2.0 A/cm.
14. The soft magnetic core in accordance claim 1 , wherein the alloy has a maximum permeability of μ max >1000.
15. The soft magnetic core in accordance with claim 14 , wherein the alloy has a maximum permeability of μ max >2000.
16. The soft magnetic core in accordance with claim 1 , wherein the electromagnetic actuator is a solenoid valve of an internal combustion engine.
17. The soft magnetic core in accordance with claim 1 , wherein the electromagnetic actuator is a fuel injection valve of an internal combustion engine.
18. The soft magnetic core in accordance with claim 1 , wherein the electromagnetic actuator is a direct fuel injection valve of a spark ignition engine.
19. The soft magnetic core in accordance with claim 1 , wherein the electromagnetic actuator is a direct fuel injection valve of a diesel engine.
20. A fuel injection valve of an internal combustion engine comprising a soft magnetic core in accordance with claim 1 .
21. The fuel injection valve in accordance with claim 20 , wherein the fuel injection valve is a direct fuel injection valve of a spark ignition engine.
22. The fuel injection valve in accordance with claim 20 , wherein the fuel injection valve is a direct fuel injection valve of a diesel engine.
23. A soft magnetic stator for an electric motor comprising a soft magnetic alloy consisting essentially of:
an amount of cobalt Co, such that 10 percent by weight≦Co≦22 percent by weight,
optionally an amount of vanadium V, such that 0 percent by weight≦V≦4 percent by weight,
an amount of chromium Cr, such that 1.5 percent by weight≦Cr≦5 percent by weight,
an amount of manganese Mn, such that 0.4 percent by weight≦Mn≦1 percent by weight,
optionally an amount of molybdenum Mo, such that 0 percent by weight≦Mo≦1 percent by weight,
an amount of silicon Si, such 0.5 percent by weight≦Si≦1.5 percent by weight,
an amount of aluminum Al, such that 0.1 percent by weight≦Al≦1.0 percent by weight,
and the remainder iron, and incidental impurities of up to 200 ppm nitrogen, up to 400 ppm carbon, and up to 100 ppm oxygen,
wherein the content of the elements chromium and manganese and molybdenum and aluminium and silicon and vanadium are such that 4.0 percent by weight≦(Cr+Mn+Mo+Al+Si+V)≦9.0 percent by weight;
wherein the alloy has a specific electrical resistivity ρ>0.50 μΩm, a yield strength R p0.2 >340 MPa, a saturation J(400 A/cm)>1.00 T, a coercive field strength H c <3.5 A/cm and in its final annealed state has an elongation at rupture value of A L >2%.
24. A soft magnetic rotor for an electric motor comprising a soft magnetic alloy consisting essentially of:
an amount of cobalt Co, such that 10 percent by weight≦Co≦22 percent by weight,
optionally an amount of vanadium V, such that 0 percent by weight≦V≦4 percent by weight,
an amount of chromium Cr, such that 1.5 percent by weight≦Cr≦5 percent by weight,
an amount of manganese Mn, such that 0.4 percent by weight≦Mn≦1 percent by weight,
optionally an amount of molybdenum Mo, such that 0 percent by weight≦Mo≦1 percent by weight,
an amount of silicon Si, such 0.5 percent by weight≦Si≦1.5 percent by weight,
an amount of aluminum Al, such that 0.1 percent by weight≦Al≦1.0 percent by weight,
and the remainder iron, and incidental impurities of up to 200 ppm nitrogen, up to 400 ppm carbon, and up to 100 ppm oxygen,
wherein the content of the elements chromium and manganese and molybdenum and aluminium and silicon and vanadium are such that 4.0 percent by weight≦(Cr+Mn+Mo+Al+Si+V)≦9.0 percent by weight;
wherein the alloy has a specific electrical resistivity ρ>0.50 μΩm, a yield strength R p0.2 >340 MPa, a saturation J(400 A/cm)>1.00 T, a coercive field strength H c <3.5 A/cm and in its final annealed state has an elongation at rupture value of A L >2%.
25. A soft magnetic component for an electromagnetic valve adjustment system in an inlet and outlet valve used in an engine compartment comprising a soft magnetic alloy consisting essentially of:
an amount of cobalt Co, such that 10 percent by weight≦Co≦22 percent by weight,
optionally an amount of vanadium V, such that 0 percent by weight≦V≦4 percent by weight,
an amount of chromium Cr, such that 1.5 percent by weight≦Cr≦5 percent by weight,
an amount of manganese Mn, such that 0.4 percent by weight≦Mn≦1 percent by weight,
optionally an amount of molybdenum Mo, such that 0 percent by weight≦Mo≦1 percent by weight,
an amount of silicon Si, such 0.5 percent by weight≦Si≦1.5 percent by weight,
an amount of aluminum Al, such that 0.1 percent by weight≦Al≦1.0 percent by weight,
and the remainder iron, and incidental impurities of up to 200 ppm nitrogen, up to 400 ppm carbon, and up to 100 ppm oxygen,
wherein the content of the elements chromium and manganese and molybdenum and aluminium and silicon and vanadium are such that 4.0 percent by weight≦(Cr+Mn+Mo+Al+Si+V)≦9.0 percent by weight;
wherein the alloy has a specific electrical resistivity ρ>0.50 μΩm, a yield strength R p0.2 >340 MPa, a saturation J(400 A/cm)>1.00 T, a coercive field strength H c <3.5 A/cm and in its final annealed state has an elongation at rupture value of A L >2%.
26. A return part for an electromagnetic actuator comprising a soft magnetic alloy consisting essentially of:
an amount of cobalt Co, such that 10 percent by weight≦Co≦22 percent by weight,
optionally an amount of vanadium V, such that 0 percent by weight≦V≦4 percent by weight,
an amount of chromium Cr, such that 1.5 percent by weight≦Cr≦5 percent by weight,
an amount of manganese Mn, such that 0.4 percent by weight≦Mn≦1 percent by weight,
optionally an amount of molybdenum Mo, such that 0 percent by weight≦Mo≦1 percent by weight,
an amount of silicon Si, such 0.5 percent by weight≦Si≦1.5 percent by weight,
an amount of aluminum Al, such that 0.1 percent by weight≦Al≦1.0 percent by weight,
and the remainder iron, and incidental impurities of up to 200 ppm nitrogen, up to 400 ppm carbon, and up to 100 ppm oxygen,
wherein the content of the elements chromium and manganese and molybdenum and aluminium and silicon and vanadium are such that 4.0 percent by weight≦(Cr+Mn+Mo+Al+Si+V)≦9.0 percent by weight;
wherein the alloy has a specific electrical resistivity ρ>0.50 μΩm, a yield strength R p0.2 >340 MPa, a saturation J(400 A/cm)>1.00 T, a coercive field strength H c <3.5 A/cm and in its final annealed state has an elongation at rupture value of A L >2%.
27. A The return part in accordance with claim 26 , wherein the electromagnetic actuator is a solenoid valve.