| (19) |
 |
|
(11) |
EP 0 084 138 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
21.08.1985 Bulletin 1985/34 |
| (43) |
Date of publication A2: |
|
27.07.1983 Bulletin 1983/30 |
| (22) |
Date of filing: 17.12.1982 |
|
|
| (84) |
Designated Contracting States: |
|
DE FR GB IT |
| (30) |
Priority: |
18.01.1982 US 340413
|
| (71) |
Applicant: ALLIED CORPORATION |
|
() |
|
|
| |
|
| (54) |
Near-zero magnetostrictive glassy metal alloys with high magnetic and thermal stability |
(57) A new series of glassy metal alloys with near zero magnetostriction is disclosed.
The glassy alloys have the composition Co
aFe
bNi
cMo
dB
eSl
f, where a ranges from about 68 to 70 atom percent, b ranges from about 2 to 7.5 atom
percent, c ranges from about 0 to 8 atom percent, d ranges from about 1 to 2 atom
percent, e ranges from about 11 to 15 atom percent and f ranges from about 9 to 14
atom percent with the proviso that the sum of a, b, c ranges from about 72 to 76 atom
percent and the sum of e and f ranges from about 23 to 26 atom percent. The magnetostriction
of these alloys ranges from about -1 x 10
-6 to +1 x 10
-6 and the saturation Induction is between about 0.6 and 0.8 Tesla. The transition metal
content is responsible for the low magnetostriction in these alloys. The metalloid
content strongly affects the saturation induction, Curie temperature, and magnetic
stability. Magnetostriction is mildly affected by the metalloid composition and a
particular range of Si/B ratio for certain iron, cobalt containing alloys wherein
the magnetostriction is near-zero and relatively insensitive to the Si/B ratio. The
same Si/B ratios also provide high magnetic stability.
