Claims
- 1. Isotropic magnetic material consisting essentially of, by weight percentage, approximately 15 to 35 percent of one or more rare earth metals, approximately 0.5 to 4.5 percent of boron, approximately 0 to 20 percent of cobalt and balanced with iron, said magnetic material containing, by weight, less than 0.1 percent of niobium and less than 0.01 percent of gallium and having an intrinsic magnetic induction, when measured at two third of its intrinsic coercivity and without taking into consideration of demagnetization correction factor, of at least two-thirds of its magnetic remanence.
- 2. The magnetic material of claim 1 wherein said intrinsic magnetic induction is at least 70 percent of its magnetic remanence.
- 3. The magnetic material of claim 1 wherein said intrinsic magnetic induction is at least 75 percent of its magnetic remanence.
- 4. The magnetic material of claim 1 having been made by a process comprising a melt spinning step.
- 5. The magnetic material of claim 4 wherein said melt spinning step employs an orifice and a wheel, with a distance between said orifice and wheel being less than one and one half inches.
- 6. The magnetic material of claim 4 wherein said process further comprises a step of, after said melt spinning step, crushing ribbons obtained from said melt spinning step into powder.
- 7. The magnetic material of claim 6 wherein said process further comprises a step of, after said step of crushing ribbons into powder, annealing said powder.
- 8. The magnetic material of claim 7 wherein said annealing is performed at a temperature of above 600° C.
- 9. Isotropic magnetic material made from an alloy having a composition consisting essentially of, by weight percentage, approximately 15 to 35 percent of one or more rare earth metals, approximately 0.5 to 4.5 percent of boron, and approximately 0 to 20 percent of cobalt, balanced with iron, said magnetic material containing, by weight, less than 0.1 percent of niobium and less than 0.01 percent of gallium and having an intrinsic magnetic induction, when measured at two-thirds of its intrinsic coercivity and without taking into consideration of demagnetization correction factor, of at least two-thirds of its magnetic remanence, said material having been made by a melt spinning process.
- 10. The isotropic magnetic material of claim 9 wherein said melt spinning process employs an orifice and a wheel, with a distance between said orifice and wheel being less than one and one half inches.
- 11. Isotropic magnetic material made from an alloy having a composition consisting essentially of, by weight percentage, approximately 15 to 35 percent of one or more rare earth metals, approximately 0.5 to 4.5 percent of boron, and approximately 0 to 20 percent of cobalt, balanced with iron, said magnetic material containing, by weight, less than 0.1 percent of niobium and less than 0.01 percent of gallium and having an intrinsic magnetic induction, when measured at two-thirds of its intrinsic coercivity and without taking into consideration of demagnetization correction factor, of at least two-thirds of its magnetic remanence, said magnetic material having been made by a melt spinning process wherein said alloy is melted and spun into ribbons, with a distance between an orifice and a wheel being less than one and one half inches, followed a process of crushing said ribbons into powder and annealing said powder.
- 12. The isotropic magnetic material of claim 11 wherein said ribbons are crushed into powder of less than 40 mesh size.
- 13. The isotropic magnetic material of claim 11 wherein said annealing is performed at a temperature of at least 600° C.
Parent Case Info
[0001] This is a continuation-in-part application of Ser. No. 09/000,789, filed Dec. 30, 1997, now allowed, the contents of which is incorporated by reference.
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
09000789 |
Dec 1997 |
US |
Child |
09756090 |
Jan 2001 |
US |