Claims
- 1. Composition of matter for use in forming multigrained hot-worked anisotropic magnets comprising:
- R-T-B type alloy powder, wherein R is selected from the group consisting of the rare earth elements, yttrium, and mixtures thereof, T is a transition metal, and B is boron; and
- an internal lubricant comprising at least two additives homogenously distributed throughout said R-T-B alloy powder, said at least two additives including
- (a) a glass material, and
- (b) a carbon-based material.
- 2. The composition of matter as in claim 1, wherein said glass material is selected from the group consisting of B.sub.2 O.sub.3 -SiO.sub.2 -Bi.sub.2 O.sub.3 glass and PbO-SiO.sub.2 -B.sub.2 O.sub.3 glass.
- 3. The composition of matter as in claim 1 wherein said glass material is selected to have a melting point of less than about 650.degree. C.
- 4. The composition of matter as in claim 3, wherein said glass material has a melting point of about 550.degree. C.
- 5. The composition of matter as in claim 1, wherein said carbon-material is graphite.
- 6. The composition of matter as in claim 1, wherein said glass material is present in an amount of about 0.1 weight percent to about 0.3 weight percent.
- 7. The composition of matter as in claim 6, wherein about 0.3 weight percent of said glass material is present.
- 8. The composition of matter as in claim 1, wherein said carbon-material is present in an amount of about 0.1 weight percent to about 0.3 weight percent.
- 9. The composition of matter as in claim 8, wherein about 0.3 weight percent of carbon-material is present.
- 10. The composition of matter as in claim 7 wherein about 0.3 weight percent of carbon-material is present.
Parent Case Info
This is a division of application Ser. No. 07/355,641 now allowed U.S. Pat. No. 4,952,251, filed May 23, 1989.
US Referenced Citations (4)
Foreign Referenced Citations (7)
Number |
Date |
Country |
0133758 |
Aug 1983 |
EPX |
0126179 |
Nov 1984 |
EPX |
0915219 |
Sep 1986 |
EPX |
6134101 |
Jan 1984 |
JPX |
60-184602 |
Sep 1985 |
JPX |
6398105 |
Jan 1986 |
JPX |
63-232301 |
Jan 1987 |
JPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
355641 |
May 1989 |
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