Ultra-low cobalt iron-cobalt magnetic alloys
A magnetic iron alloy and process of making the same. The alloy includes iron, approximately 2 wt. % to approximately 8 wt. % cobalt, approximately 0.05 wt. % to approximately 5 wt. % manganese, and approximately 0.05 wt. % to approximately 5 wt. % silicon. The alloy may also include up to approximately 0.3 wt. % chromium, up to approximately 2 wt. % vanadium, up to approximately 1 wt. % nickel, up to approximately 0.05 wt. % niobium, and up to approximately 0.02 wt. % carbon.
1. A magnetic isotropic iron alloy comprising:
Iron (Fe);
cobalt (Co) from greater than 5 wt % to approximately 8 wt. %;
approximately 0.05 wt. % to approximately 5 wt. % manganese (Mn);
approximately 1.3 wt. % to approximately 5 wt. % silicon (Si);
chromium, up to approximately 0.3 wt. %;
vanadium, up to approximately 2 wt. %;
copper, up to approximately 0.05 wt. %; and
gadolinium (Gd) from 0.11 wt % to approximately 0.15 wt %.
2. The magnetic iron alloy of claim 1 , further comprising one or more of:
nickel up to approximately 1 wt. %;
niobium up to approximately 0.05 wt. %; and
carbon up to approximately 0.02 wt. %.
3. The magnetic iron alloy of claim 1 , wherein the alloy has an electrical resistivity (ρ) of at least approximately 40 μΩcm.
4. The magnetic iron alloy of claim 1 , wherein the alloy has a saturation induction (B s ) of at least approximately 20 kG.
5. The magnetic iron alloy of claim 1 , wherein the alloy has a coercivity (H c ) of less than approximately 2 Oe.
6. The magnetic iron alloy of claim 1 , wherein the alloy has an ρ of at least approximately 40 μΩcm, a B s of at least approximately 20 kG, and a H c of less than approximately 2 Oe.
7. The magnetic iron alloy of claim 1 , wherein the alloy comprises primarily a single alpha (α) phase.
8. The magnetic iron alloy of claim 7 , wherein the alloy comprises at least approximately 95% of the alpha phase.
9. The magnetic iron alloy of claim 7 , wherein the alloy comprises at least approximately 99% of the alpha phase.
10. A magnetic iron alloy comprising:
iron;
cobalt from greater than 5 wt. % to approximately 8 wt. %;
approximately 0.05 wt. % to approximately 5 wt. % manganese;
approximately 1.3 wt. % to approximately 5 wt. % silicon,
chromium, up to approximately 0.3 wt. %;
vanadium, up to approximately 2 wt. %;
copper, up to approximately 0.05 wt. %; and
gadolinium (Gd) from 0.11 wt % to approximately 0.15 wt %,
wherein the alloy has a ρ of at least approximately 40 μΩcm, a B s of at least approximately 20 kG, and a H c of less than approximately 2 Oe.
11. The magnetic iron alloy of claim 10 , further comprising one or more of:
nickel up to approximately 1 wt. %;
niobium up to approximately 0.05 wt. %; and
carbon up to approximately 0.02 wt. %.
12. The magnetic iron alloy of claim 10 , wherein the alloy comprises at least approximately 95% of an alpha phase.
13. The magnetic iron alloy of claim 10 , wherein the alloy comprises at least approximately 99% of an alpha phase.
14. The magnetic iron alloy of claim 10 , wherein the alloy includes approximately 8 wt. % Co, approximately 2.2 wt. % Mn, and approximately 1.3 wt. % Si.