Claims
- 1. A method for manufacturing a rare earth permanent magnet comprising the steps of:
- (i) applying a first solid solution heat treatment to an alloy ingot having the composition represented by the formula: Ce(Co.sub.1-x-y-a Fe.sub.x Cu.sub.y M.sub.a).sub.z, wherein a, x, y, and z represent numbers such that: 0.005<a<0.100; 0.20<x<0.40; 0.10<y<0.30; 4.8<z<6.0; and M designates an element selected from the group consisting of zirconium, titanium, nickel, manganese and combinations thereof; at temperatures of 900.degree.-1100.degree. C. for a period from 10 minutes to 100 hours;
- (ii) pulverizing the alloy ingot;
- (iii) producing a magnet body from this pulverized alloy by:
- a) orienting the pulverized alloy in a magnetic field; and
- b) pressing the oriented alloy into a compact to form a magnet;
- (iv) sintering the magnet;
- (v) applying a second solid solution heat treatment to the sintered magnet at temperatures 900.degree.-1100.degree. C. for a period from 10 minutes to 100 hours; and
- (vi) applying an aging heat treatment to the sintered magnet.
- 2. A method of claim 1, wherein a, x, y, and z are such that: 0.010.ltoreq.a<0.060; 0.20<x.ltoreq.0.30; 0.15.ltoreq.y.ltoreq.0.25; 4.8<z.ltoreq.5.5.
- 3. A method of claim 1, wherein said first and second solid solution heat treatments are conducted at temperatures of 900.degree.-1000.degree. C. for a period from one hour to 30 hours.
- 4. A method of claim 1, wherein a, x, y, and z are such that: 0.010.ltoreq.a<0.060; 0.20<x.ltoreq.0.30; 0.15.ltoreq.y.ltoreq.0.25; 4.8<z.ltoreq.5.5; and wherein said first and second solid solution heat treatments are conducted at temperatures of 900.degree.-1000.degree. C. for a period from one hour to 30 hours.
Priority Claims (1)
Number |
Date |
Country |
Kind |
63-50799 |
Mar 1988 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 07/319,408, filed Mar. 3, 1989, abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4322257 |
Menth et al. |
Mar 1982 |
|
4734131 |
Arai et al. |
Mar 1988 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
319408 |
Mar 1989 |
|