SECo.sub.5 -Permanent magnet joined to at least one iron mass and method of fabricating such a permanent magnet
AssigneeBBC Brown, Boveri & Company, Limited
InventorJaroslaw Houska
Life of this patent
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Abstract
An SECo.sub.5 -permanent magnet composite of said permanent magnet bonded to at least one piece of iron wherein there is provided between said permanent magnet and the iron piece a metallic layer which is hard-soldered to both the permanent magnet and the iron piece, and wherein SE is an element having an atomic number of 58-71 or mixtures thereof.
Claims5
An SECo.sub.5 -permanent magnet composite of said permanent magnet bonded to at least one piece of iron wherein there is provided between said permanent magnet and the iron piece a metallic intermediate layer comprising Cu, Ag, Au or alloys thereof, or an alloy selected from the group consisting of:
- Cu Au (70/30), Cu Au Ni (62/35/3), Cu Au (62.5/37.5), Cu Ag (95/5), Au Ni (82/18), Cu Sn Ag (85/8/7), Cu Au Ag (55/42/3), Au Cu Ag (58/40/2), Cu Ag (60/40), Au Cu Ag (75/20/5), Au Cu (81.5/18.5), Pt Sn (70/30), Ni FeP (56/33/11), Ti Ni (70/30), Cu Si (97/3), Cu Mg (85/15), Ni P (89/11), Cu Ti (76/24), Cu Zn (60/40), Cu Zn Sn (59/39/2), Cu Zn (42/58), Cu Zn (54/46), Ag Cu Zn (5/55/40), Ag Cu Zn (12/48/40), Ag Cu Cd Zn (12/50/5/33), Ag Cu Zn (20/44/36) or mixtures thereof, wherein the numbers in parenthesis refer to the proportions by weight of the respective alloy components and having a thickness equal to or less than 50 .mu.m which is hard-soldered to both the permanent magnet and the iron piece, and wherein SE is an element having an atomic number of 58-71 or mixtures thereof.
A method of producing an SeCo.sub.5 -permanent magent bonded to an iron substrate which comprises:
- a. providing said iron substrate and said permanent magnet with at least one solderable surface by grinding and subsequently cleaning said surface with an organic solvent;
- b. covering said solderable surface with at least one solderable, intermediate foil layer having a thickness of 50 .mu. or less wherein said intermediate foil layer contains Cu, Ag, Ni, Sn or mixtures thereof;
- c. clamping said permanent magnet, intermediate layer and said iron substrate together to form a work piece combination;
- d. soldering said work piece under a protective atmosphere at a temperature of above 600.degree. C., and
- e.. rapidly cooling the soldered work piece.
Dependencies are inferred from the claim text.