| (19) |
 |
|
(11) |
EP 0 575 190 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
26.01.1994 Bulletin 1994/04 |
| (43) |
Date of publication A2: |
|
22.12.1993 Bulletin 1993/51 |
| (22) |
Date of filing: 17.06.1993 |
|
|
| (84) |
Designated Contracting States: |
|
DE FR GB IT NL |
| (30) |
Priority: |
17.06.1992 JP 158338/92
|
| (71) |
Applicant: MITSUI PETROCHEMICAL INDUSTRIES, LTD. |
|
Tokyo 100 (JP) |
|
| (72) |
Inventors: |
|
- Watanabe, Hiroshi,
c/o Mitsui Petrochem. Ind. Ltd.
Sodegaura-shi,
Chiba-ken (JP)
- Hirota, Yoshihiko,
c/o Mitsui Petrochem. Ind. Ltd.
Sodegaura-shi,
Chiba-ken (JP)
|
| (74) |
Representative: Cresswell, Thomas Anthony |
|
J.A. Kemp & Co.
14 South Square
Gray's Inn
London WC1R 5LX
London WC1R 5LX (GB) |
|
| |
|
| (54) |
Fe-base soft magnetic alloy and process for making same |
(57) A Fe-base soft magnetic alloy of formula Fe
100-a-b-c-dP
aM
bM'
cCu
d where M is at least one element selected from Zr, Hf, Nb, Mo, W, Ta, Ti, V, Cr, Mn,
Y and Ce; M' is at least one element selected from Si, Al, Ga, Ge, Ru, Co, Ni, Sn,
Sb and Pd;
a, b, c and d each are an atomic % and satisfy the relations: 0 < a ≦ 25, 0 < b ≦
15, 0 ≦ c ≦ 20, and 0 ≦ d ≦ 5 having excellent soft magnetic properties, especially
low magnetostriction and low iron loss is made by adding a determined amount of a
specific element M, a determined amount of Cu is further added to the alloy and the
quenched alloy composition is shaped and heat-treated to provide the Fe-base soft
magnetic alloy.