Spherical particles of Fe base metallic glass alloy, Fe base sintered alloy soft magnetic material in bulk form produced by sintering the same, and method for their production
Foreign code | F110003604 |
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File No. | E05111US |
Posted date | Jun 30, 2011 |
Country | United States of America |
Application number | 54052703 |
Gazette No. | 20060254386 |
Gazette No. | 7622011 |
Date of filing | Dec 24, 2003 |
Gazette Date | Nov 16, 2006 |
Gazette Date | Nov 24, 2009 |
International application number | JP2003016542 |
International publication number | WO2004059020 |
Date of international filing | Dec 24, 2003 |
Date of international publication | Jul 15, 2004 |
Priority data |
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Title | Spherical particles of Fe base metallic glass alloy, Fe base sintered alloy soft magnetic material in bulk form produced by sintering the same, and method for their production |
Abstract |
(US7622011) Disclosed is a Fe-Ga-P-C-B-Si based metallic glass alloy particle prepared by a gas atomizing process, which has an approximately complete spherical shape, a relatively large particle size and a high crystallization temperature (Tx). The plurality of particles may be subjected to a spark plasma sintering process at the crystallization temperature or less under a compression pressure of 200 MPa or more, to provide a bulk Fe-based sintered metal soft magnetic material of metallic glass, which has a high density, a single phase structure of metallic glass in an as-sintered state, excellent soft magnetic characteristics applicable to a core of a magnetic head, a transformer or a motor, and a high specific resistance. |
Scope of claims |
[claim1] 1. A sintered soft magnetic element, comprising: Fe-based sintered alloy soft magnetic material of metallic glass, the sintered soft magnetic element being prepared by sintering, in a temperature range of 573 K to the crystallization temperature (Tx), spherical particles of Fe-based metallic glass alloy prepared by an atomizing process, the spherical particles having a particle size of 30 to 125 mu m; a composition consisting of, by atomic %, 0.5 to 10% of Ga, 7 to 15% of P, 3 to 7% of C, 3 to 7% of B and 1 to 7% of Si, with the remainder being Fe, the Fe-based metallic glass alloy having a crystallization temperature (Tx) of 770 to 800 K and a liquidus temperature (Tl) of 1220 to 1300 K, wherein the Fe-based sintered alloy soft magnetic material has metallic glass phase of high-density with a relative density of 99.0% or more, a magnetic permeability of 3900 (mu max) or more, a coercive force (Hc) of 19 (A/m) or less and a specific resistance of 1.6 mu OMEGA m or more in an as-sintered state, wherein the Fe-based sintered alloy soft magnetic material has a temperature interval of a supercooled liquid region (DELTA Tx) of 25 K or more, as expressed by a formula: DELTA Tx=Tx-Tg, wherein Tx is a crystallization temperature, and Tg is a glass transition temperature; and a reduced glass transition temperature of 0.59 or more, as expressed by a formula: Tg/Tl, wherein Tg is a glass transition temperature, and Tl is a liquidus temperature. [claim2] 2. A sintered soft magnetic element as defined in claim 1 sintering is performed in a temperature range of 573 to 723 K, wherein the Fe-based sintered alloy soft magnetic material has a magnetic permeability of 7000 (mu max) or more and a coercive force (Hc) of 12 (A/m) or less. [claim3] 3. A sintered soft magnetic element, comprising: sintered metallic glass particles of a composition consisting of, by atomic %, 0.5 to 10% of Ga, 7 to 15% of P, 3 to 7% of C, 3 to 7% of B and 1 to 7% of Si, with the remainder being Fe, said metallic glass particles having maximum particle size of 30 to 125 mu m, wherein the Fe-based alloy soft magnetic material has metallic glass phase of high-density with a relative density of 99.0% or more, a magnetic permeability of 3900 (mu max) or more, a coercive force (Hc) of 19 (A/m) or less and a specific resistance of 1.6 mu OMEGA m or more in an as-sintered state, wherein the Fe-based alloy soft magnetic material has a temperature interval of a supercooled liquid region (DELTA Tx) of 25 K or more, as expressed by a formula: DELTA Tx=Tx-Tg, wherein Tx is a crystallization temperature, and Tg is a glass transition temperature; and a reduced glass transition temperature of 0.59 or more, as expressed by a formula: Tg/Tl, wherein Tg is a glass transition temperature, and Tl is a liquidus temperature. [claim4] 4. A sintered soft magnetic element as defined in claim 1, wherein the Fe-based sintered alloy soft magnetic material has a magnetic permeability of 7000 (mu max) or more and a coercive force (Hc) of 12 (A/m) or less. |
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IPC(International Patent Classification) |
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Reference ( R and D project ) | ERATO INOUE Superliquid Class AREA |
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