Claims
- 1. A method for producing an alloy used for the production of a rare-earth magnet, comprising the steps of:preparing an alloy-melt which consists of from 35 to 60% by weight of at least one rare-earth element (R) selected from the group consisting of Nd, Dy and Pr, and the balance being Fe; feeding the alloy melt into a rotary tubular mold having an inner surface and onto one or more portions of the inner surface; rotating the rotary tubular mold around its longitudinal central axis; accumulating the alloy melt onto the inner surface of the rotary tubular mold at an average rate of 0.1 cm/second or less; and, centrifugally casting the alloy melt being accumulated at said average rate.
- 2. A method for producing an alloy used for the production of a rare-earth magnet, comprising the steps of:preparing an alloy-melt which consists of from 35 to 60% by weight of at least one rare-earth element (R) selected from the group consisting of Nd, Dy and Pr, and at least one element selected from the group consisting of 35% by weight or less of Co, 4% by weight or less of Cu, 3% by weight or less of Al and 3% by weight or less of Ga, and the balance being Fe; feeding the alloy melt into a rotary tubular mold having an inner surface and onto one or more portions of the inner surface; rotating the rotary tubular mold around its longitudinal central axis; accumulating the alloy melt onto the inner surface of a mold at an average rate of 0.1 cm/second or less; and, centrifugally casting the alloy melt being accumulated at said average rate.
- 3. A method for producing an alloy used for the production of a rare-earth magnet alloy according to claim 1 or 2, wherein the average accumulating rate is from 0.005 to 0.1 cm/second.
- 4. A method for producing an alloy used for the production of a rare-earth magnet alloy according to claim 1 or 2, further comprising a step of reciprocating a means for feeding the alloy melt in the longitudinal direction of the rotary tubular mold.
- 5. A method for producing an alloy used for the production of a rare-earth magnet alloy according to claim 1 or 2, further comprising a step of bringing the cast melt into contact with an atmosphere containing inert-gas.
- 6. A method for producing an alloy used for the production of a rare-earth magnet alloy according to claim 5, wherein the inert-gas containing atmosphere contains 20% or more of helium.
- 7. A method for producing an alloy used for the production of a rare-earth magnet alloy according to claim 1 or 2, further comprising a step of blowing a cooling gas, which comprises an inert-gas, onto the inner surface of the rotary tubular mold, during the centrifugal casting.
- 8. A method for producing an alloy used for the production of a rare-earth magnet alloy according to claim 1 or 2, further comprising steps of:bringing the cast melt into contact with an inert-gas containing atmosphere; and, blowing a cooling gas, which comprises an inert-gas, onto the inner surface of the rotary tubular mold, during the centrifugal casting.
- 9. A method for producing an alloy used for the production of a rare-earth magnet alloy according to claim 1 or 2, wherein the alloy melt is fed on the inner surface of the rotary tubular mold; said inner surface is metallic and not covered by a coating agent.
- 10. A method for producing an alloy used for the production of a rare-earth magnet alloy according to claim 1 or 2, wherein the alloy melt is fed on the inner surface of the rotary tubular mold; said inner surface consists of cast alloy formed by the method of claim 3 or 4.
Parent Case Info
This application is a division of prior application Ser. No. 08/968,005, filed Nov. 12, 1997, now U.S. Pat. No. 5,978,179
US Referenced Citations (8)
Foreign Referenced Citations (4)
Number |
Date |
Country |
8-13078 |
Jan 1996 |
JP |
8-296005 |
Nov 1996 |
JP |
9-31609 |
Feb 1997 |
JP |
9-111383 |
Apr 1997 |
JP |
Non-Patent Literature Citations (5)
Entry |
Patent Abstracts Of Japan: JP Publication No. 07-011307, Jan. 13, 1995. |
Japanese Unexamined Patent Publication No. 1-150,303, Jun. 13, 1989. |
Japanese Unexamined Patent Publication No. 59-085-845, May 17, 1984 (abstract only). |
Japanese Unexamined Patent Publication No. 57-134,533, Aug. 19, 1982 (abstract only). |
Japanese Unexamined Patent Publication No. 52-155,126, Dec. 23, 1977 (abstract only). |