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US5225006A
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Fe-based soft magnetic alloy
Assignee: Toshiba Corp
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Filing: 1991-06-11
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Granted: 1993-07-06
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Expires: 2011-06-11
Abstract
Abstract Fe-based soft magnetic alloy having excellent soft magnetic characteristics with high saturated magnetic flux density, characterized in that it has fine crystal grains and is expressed by the general formula: Fe.sub.100-a-b-c-d M.sub.a M'.sub.b Y.sub.c N.sub.d where M is at one or more selected from Cu, Ag, Au, Zn, Sn, Pb, Sb, and Bi; M' is at least one or more selected from the elements of Groups IVa, Va, VIa of the periodic table, or Mn, Co, Ni, and Al, Y is at least one or more selected from Si, P, or B, and wherein "a", "b", "c" and "d" expressed in at. % are as follows: 0.01≦a≦5 0.1≦b≦10 15≦c≦28 0<d≦8. A method is also provided treating the alloy to segregate fine crystal grains. The method involves heat treating the alloy for from one minute to ten hours at a temperature of from 50° C. below to 120° C. above the crystallization temperature of said alloy.
Inventors
- 👤 Takao Sawa
- 👤 Masami Okamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:50
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15308
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
105 words
An Fe-based soft magnetic alloy comprising fine crystal grains and amorphous regions, the composition of said alloy being described by the following formula: Fe.sub.100-a-b-d-c M.sub.a M'.sub.b Y.sub.c N.sub.4 where "M" is at least one element selected from the group consisting of Cu, Ag, Au, Zn, Sn, Pb, Sb, and Bi; "M'" is at least one element selected from the group consisting of Groups IVa, Va, and VIa of the periodic table, Mn, Co, Ni, and Al; "Y" is at least one element selected from the group consisting of Si, P, and B; and wherein "a", "b" and "c" expressed in atomic % are as follows:
Claim 2
Dependent Claim
105 words
An Fe-based soft magnetic alloy comprising fine crystal grains and amorphous regions, the composition of said alloy being described by the following formula: Fe.sub.100-a-b-d-c M.sub.a M'.sub.b Y.sub.c N.sub.4 where "M" is at least one element selected from the group consisting of Cu, Ag, Au, Zn, Sn, Pb, Sb, and Bi; "M'" is at least one element selected from the group consisting of Groups IVa, Va, and VIa of the periodic table, Mn, Co, Ni, and Al; "Y" is at least one element selected from the group consisting of Si, P, and B; and wherein "a", "b" and "c" expressed in atomic % are as follows:
Claim 3
Dependent Claim
64 words
01≦a≦5 0.01≦b≦10 15≦c≦28 d≦8, and N is present in an amount sufficient to increase the range of heat treatment conditions within which fine crystal grains can be segregated as compared to an alloy having the same amounts of Fe, M, M' and Y and which does not contain nitrogen, wherein the area ratio of the fine grains in said alloy is at least 30%.
Claim 4
Dependent Claim
64 words
01≦a≦5 0.01≦b≦10 15≦c≦28 d≦8, and N is present in an amount sufficient to increase the range of heat treatment conditions within which fine crystal grains can be segregated as compared to an alloy having the same amounts of Fe, M, M' and Y and which does not contain nitrogen, wherein the area ratio of the fine grains in said alloy is at least 30%.
Claim 5
Dependent Claim
25 words
An Fe-based soft magnetic alloy according to claim 1, wherein the area ratio of the fine crystal gains in said alloy is at least 40%.
Claim 6
Dependent Claim
28 words
An Fe-based soft magnetic alloy according to claim 2 wherein at least 80% of said fine crystal grains are in the range of 50 Å to 300° Å.
Claim 7
Dependent Claim
27 words
An Fe-based soft magnetic alloy according to claim 1, wherein at least 80% of said fine grains are in the range of 50 Å to 300 Å.
Claim 8
Dependent Claim
22 words
An Fe-based soft magnetic alloy according to claim 1 wherein "M" is present in the range of 0.5 to 3 Atomic %.
Claim 9
Dependent Claim
25 words
An Fe-based soft magnetic alloy alloy according to claim 1 wherein the amount of "M'" is in the range of 1 to 7 Atomic %.
Claim 10
Dependent Claim
24 words
An Fe-based soft magnetic alloy according to claim 1 wherein the amount of "M'" is in the range of 1.5 to 5 Atomic %.
Claim 11
Dependent Claim
24 words
An Fe-based soft magnetic alloy according to claim 1 wherein the amount of "Y" is in the range of 18 to 26 Atomic %.
Claim 12
Dependent Claim
33 words
An Fe-based soft magnetic alloy according to claim 1, comprising Si and at least one of Bi and P such that the ratio of Si/B or the ratio Si/P is more than one.
Claim 13
Dependent Claim
20 words
An Fe-based soft magnetic alloy according to claim 1 wherein the amount of nitrogen is less than 8 Atomic %.
Claim 14
Dependent Claim
18 words
An Fe-based soft magnetic alloy as claimed in claim 13, wherein d is at least 2 atomic %.
Claim 15
Dependent Claim
20 words
An Fe-based soft magnetic alloy according to claim 1 wherein the amount of nitrogen is less than 6 Atomic %.
Claim 16
Dependent Claim
18 words
An Fe-based soft magnetic alloy as claimed in claim 14, wherein d is at least 2 atomic %.
Claim 17
Dependent Claim
20 words
An Fe-based soft magnetic alloy according to claim 1 wherein the amount of nitrogen is less than 4 atomic %.
Claim 18
Dependent Claim
18 words
An Fe-based soft magnetic alloy as claimed in claim 15, wherein d is at least 2 atomic %.
Claim 19
Dependent Claim
24 words
An Fe-based soft magnetic alloy according to claim 1, wherein at least 50% of the area ratio of said alloy is fine crystal grains.
Claim 20
Dependent Claim
30 words
A magnetic core, comprising a strip of an Fe-based soft magnetic alloy having fine crystal grains as claimed in claim 1, said strip being wound to form a toroidal core.
Claim 21
Dependent Claim
14 words
A magnetic core as claimed in claim 17, wherein said core is resin molded.
Claim 22
Dependent Claim
18 words
An Fe-based soft magnetic alloy as claimed in claim 1, wherein d is at least 2 atomic %.
Claim 23
Dependent Claim
24 words
An Fe-based soft magnetic alloy according to claim 1, wherein the area ratio of the fine grains in said alloy is at least 50%.
Claim 24
Dependent Claim
27 words
An Fe-based soft magnetic alloy according to claim 1, wherein at least 80% of said fine grains are in the range of 50 Å to 300 Å.
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