US6048601A
Expired / Lapsed
US
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Soft magnetic alloy powder for electromagnetic and magnetic shield, and shielding members containing the same
Assignee: Daido Steel Co Ltd
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Filing: 1998-01-20
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Granted: 2000-04-11
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Expires: 2018-01-20
Abstract
Abstract Disclosed is soft magnetic alloy powder for electromagnetic and magnetic shield, which can be easily flattened and exhibits good performance over a high frequency band, and a shielding member of good shield effect prepared by dispersing the powder in a matrix of rubber or plastics. Powder of a soft magnetic alloy, which consists essentially of, by weight %, Cr: 0.5.0-20%, Si: 0.01-0.5%, Al: 0.01-20% and the balance of Fe and inevitable impurities, is flattened in an attritor, and is added to the matrix material at a content of 30 wt. % or higher, preferably, as high as possible, and processed to form sheets or molded articles. The shielding member of particularly high flame resistance is prepared by adding soft magnetic alloy powder of alloy composition consisting essentially of, by weight %, Cr: 5-14%, Si: 0.01-0.5%, Al: 0.5-20%, and preferably, REM: up to 0.5%, and the balance of Fe and inevitable impurities, after being flattened, is added to a matrix material of chlorine-containing flame resistant rubber or plastics at a high content, and processed to form sheets or molded articles.
Inventors
- 👤 Shin'ichiro Yahagi
- 👤 Akihiko Saito
- 👤 Michiharu Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:15
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0083; C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14766; H01F1/14791; H01F1/20; H01F1/22; H01F1/24; H01F1/26; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S428/92; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/24405; Y10T428/24413; Y10T428/25; Y10T428/256; Y10T428/28; Y10T428/29; Y10T428/2913; Y10T428/298
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
29 words
A soft magnetic alloy powder for electromagnetic and magnetic shield, consisting of, by weight %, Cr: 0.5-20%, Si: 0.001-0.5%, Al: 0.01-20% and the balance of Fe and inevitable impurities.
Claim 2
Dependent Claim
29 words
A soft magnetic alloy powder for electromagnetic and magnetic shield, consisting of, by weight %, Cr: 0.5-20%, Si: 0.001-0.5%, Al: 0.01-20% and the balance of Fe and inevitable impurities.
Claim 3
Dependent Claim
40 words
A soft magnetic alloy powder for electromagnetic and magnetic shield, consisting of, by weight %, Cr: 5-14%, Si: 0.01-0.5%, Al: 0.5-20%, wherein the value of Cr %+3Al % is 30 or higher, and the balance of Fe and inevitable impurities.
Claim 4
Dependent Claim
40 words
A soft magnetic alloy powder for electromagnetic and magnetic shield, consisting of, by weight %, Cr: 5-14%, Si: 0.01-0.5%, Al: 0.5-20%, wherein the value of Cr %+3Al % is 30 or higher, and the balance of Fe and inevitable impurities.
Claim 5
Dependent Claim
45 words
A soft magnetic alloy powder for electromagnetic and magnetic shield, consisting of, by weight %, Cr: 5-14%, Si: 0.01-0.5%, Al: 0.5-20% and REM: up to 0.5%, wherein the value of Cr %+3Al % is 30 or higher, and the balance of Fe and inevitable impurities.
Claim 6
Dependent Claim
45 words
A soft magnetic alloy powder for electromagnetic and magnetic shield, consisting of, by weight %, Cr: 5-14%, Si: 0.01-0.5%, Al: 0.5-20% and REM: up to 0.5%, wherein the value of Cr %+3Al % is 30 or higher, and the balance of Fe and inevitable impurities.
Claim 7
Dependent Claim
29 words
A soft magnetic alloy powder for electromagnetic and magnetic shield according to one of claims 1 to 3, wherein the aspect ratio of the powder is 2 or higher.
Claim 8
Dependent Claim
46 words
A shielding member for electromagnetic and magnetic shield, prepared by dispersing soft magnetic alloy powder consisting of, by weight %, Cr: 0.5-20%, Si: 0.001-0.5%, Al: 0.01-20% and the balance of Fe and inevitable impurities in a matrix of rubber or plastics and processing to shaped articles.
Claim 9
Dependent Claim
46 words
A shielding member for electromagnetic and magnetic shield, prepared by dispersing soft magnetic alloy powder consisting of, by weight %, Cr: 0.5-20%, Si: 0.001-0.5%, Al: 0.01-20% and the balance of Fe and inevitable impurities in a matrix of rubber or plastics and processing to shaped articles.
Claim 10
Dependent Claim
22 words
A shielding member for electromagnetic and magnetic shield according to claim 5, wherein the article is in the form of a sheet.
Claim 11
Dependent Claim
31 words
A shielding member for electromagnetic and magnetic shield according to claim 6, wherein an adhesive layer is provided on whole or a part of a surface or surfaces of the sheet.
Claim 12
Dependent Claim
33 words
A shielding member for electromagnetic and magnetic shield according to claim 6, wherein plural projecting points or lines are formed on whole or a part of a surface or surfaces of the sheet.
Claim 13
Dependent Claim
56 words
A flame resistant shielding member for electromagnetic and magnetic shield, prepared by dispersing a soft magnetic alloy powder consisting of, by weight %, Cr: 5-14%, Si: 0.01-0.5%, Al: 0.5-20%, wherein the value of Cr %+3Al % is 30 or higher, and the balance of Fe and inevitable impurities, in a matrix of chlorine-containing rubber or plastics.
Claim 14
Dependent Claim
56 words
A flame resistant shielding member for electromagnetic and magnetic shield, prepared by dispersing a soft magnetic alloy powder consisting of, by weight %, Cr: 5-14%, Si: 0.01-0.5%, Al: 0.5-20%, wherein the value of Cr %+3Al % is 30 or higher, and the balance of Fe and inevitable impurities, in a matrix of chlorine-containing rubber or plastics.
Claim 15
Dependent Claim
61 words
A flame resistant shielding member for electromagnetic and magnetic shield, prepared by dispersing a soft magnetic alloy powder consisting of, by weight %, Cr: 5-14%, Si: 0.01-0.5%, Al: 0.5-20% and REM: up to 0.5%, wherein the value of Cr %+3Al % is 30 or higher, and the balance of Fe and inevitable impurities, in a matrix of chlorine-containing rubber or plastics.
Claim 16
Dependent Claim
61 words
A flame resistant shielding member for electromagnetic and magnetic shield, prepared by dispersing a soft magnetic alloy powder consisting of, by weight %, Cr: 5-14%, Si: 0.01-0.5%, Al: 0.5-20% and REM: up to 0.5%, wherein the value of Cr %+3Al % is 30 or higher, and the balance of Fe and inevitable impurities, in a matrix of chlorine-containing rubber or plastics.
Claim 17
Dependent Claim
35 words
A flame resistant shielding member for electromagnetic and magnetic shield according to claim 9 or claim 10, wherein the soft magnetic alloy powder is flat and the content thereof is, by weight, 30% or higher.
Claim 18
Dependent Claim
31 words
A flame resistant shielding member for electromagnetic and magnetic shield according to claim 9 or claim 10, wherein the matrix is a chlorinated rubber or plastic of a flame resistant grade.
Claim 19
Dependent Claim
28 words
A flame resistant shielding member for electromagnetic and magnetic shield according to claim 11, wherein the matrix is a chlorinated rubber or plastic of a flame resistant grade.
Claim 20
Dependent Claim
41 words
A flame resistant shielding member for electromagnetic and magnetic shield according to claim 9 or claim 10, wherein the member is in the form of a molded article made by injection molding or extrusion molding, or a sheet made by calendering.
Claim 21
Dependent Claim
38 words
A flame resistant shielding member for electromagnetic and magnetic shield according to claim 10, wherein the member is in the form of a molded article made by injection molding or extrusion molding, or a sheet made by calendering.
Claim 22
Dependent Claim
38 words
A flame resistant shielding member for electromagnetic and magnetic shield according to claim 13, wherein the member is in the form of a molded article made by injection molding or extrusion molding, or a sheet made by calendering.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-04-11 | 2003-10-11 | 2004-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-04-11 | 2007-10-11 | 2008-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-04-11 | 2011-10-11 | 2012-04-11 | $7700.00 | Window Closed / Lapsed |