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EP0342923A2
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EP
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Fe-based soft magnetic alloy
Assignee: Toshiba Corp
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Filing: 1989-05-16
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Granted: —
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Expires: 2009-05-16
Abstract
Abstract Fe-based soft magnetic alloy having excellent soft magnetic characteristics with high saturated magnetic flux density, characterized by fine crystal grains and the general formula (I) (Fe 1-a-b Cu a M b ) 100-c Y c (I) where "M" is at least one rare earth element, "Y" is at least one of: Si, B, P, and C, and "a", "b", and "c", expressed in atomic % are as follows: 0.005 ≦ a ≦ 0.05 0.005 ≦ b ≦ 0.1 15 ≦ c ≦ 28.
Inventors
- 👤 Takao C/O Intellectual Property Division Sawa
- 👤 Masami C/O Intellectual Property Division Okamura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 12:02
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15308; C; C22; C22C; C22C45/00; C22C45/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
76 words
An Fe-based, soft magnetic alloy having fine crystal grains, defined by formula (I): (Fe 1-a-b Cu a M b ) 100-c Y c ; (I) where "M" is at least one rare earth element; "Y" is at least one element from the following: Si, B, P, and C; and wherein "a", "b", and "c", expressed in atomic %, are as follows: 0.005 ≦ a ≦ 0.05 0.005 ≦ b ≦ 0.1 15 ≦ c ≦ 28.
Claim 2
Dependent Claim
76 words
An Fe-based, soft magnetic alloy having fine crystal grains, defined by formula (I): (Fe 1-a-b Cu a M b ) 100-c Y c ; (I) where "M" is at least one rare earth element; "Y" is at least one element from the following: Si, B, P, and C; and wherein "a", "b", and "c", expressed in atomic %, are as follows: 0.005 ≦ a ≦ 0.05 0.005 ≦ b ≦ 0.1 15 ≦ c ≦ 28.
Claim 3
Dependent Claim
22 words
An alloy according to claim 1, wherein the area ratio of said fine crystal grains in the alloy is at least 30%.
Claim 4
Dependent Claim
27 words
An alloy according to claim 1 or 2 wherein at least 80% of said fine grains are in the range of 50 Å to 300 Å .
Claim 5
Dependent Claim
15 words
An alloy according to any preceding claim wherein the ratio Si:B, and/or C:P is >1.
Claim 6
Dependent Claim
26 words
An alloy according to any preceding claim wherein copper is present in an amount of 0.005 to 0.05 Atomic %, preferably 0.01 to 0.04 Atomic %.
Claim 7
Dependent Claim
38 words
An Fe-based soft magnetic alloy according to any preceding claim wherein the amount of "M" is in the range of 0.005 to 0.1 Atomic %, preferably 0.01 to 0.08 Atomic %, more preferably 0.02 to 0.05 Atomic %.
Claim 8
Dependent Claim
28 words
An alloy according to any preceding claim wherein the amount of "Y" is in the range of 15 to 28 Atomic %, preferably 18 to 26 Atomic %.
Claim 9
Independent Claim
52 words
A method of treating an Fe-based soft magnetic alloy according to any preceding claim which comprises heat treating said alloy for a period of from one minute to ten hours at a temperature from 50C o below the crystallization temperature to 120C o above the crystallization temperature to segregate fine crystal grains.
Claim 10
Dependent Claim
21 words
A method according to claim 8 wherein said alloy is heat treated for a period of ten minutes to five hours.
References Cited (Backward Citations)
No citation records indexed.
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