EP0177276A2
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EP
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Compressed magnetic powder core
Assignee: Toshiba Corp
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Filing: 1985-09-26
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Granted: —
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Expires: 2005-09-26
Abstract
Abstract A compressed powder core is made of a compressed body of a magnetic powder each particle of which has a surface covered with an insulating layer. The insulating layer is formed of an insulating material selected from the group consisting of an inorganic compound powder having an electronegativity of not less than 12.5, an inorganic compound powder having an electronegativity of less than 8.5, a metal alkoxide and a decomposition product of a metal alkoxide.
Inventors
- 👤 Kumi C/O Patent Division Ochiai
- 👤 Hiromichi C/O Patent Division Horie
- 👤 Itsuo C/O Patent Division Arima
- 👤 Mikio C/O Patent Division Morita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 06:42
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/20; H01F1/22; H01F1/24
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
69 words
A compressed magnetic powder core comprising a compressed body of a magnetic powder each particle of which has a surface covered with an insulating layer comprising an insulating material selected from the group consisting of an inorganic compound powder having an electronegativity of not less than 12.5, an inorganic compound powder having an electronegativity of less than 8.5, a metal alkoxide and a decomposition product of a metal alkoxide.
Claim 2
Dependent Claim
69 words
A compressed magnetic powder core comprising a compressed body of a magnetic powder each particle of which has a surface covered with an insulating layer comprising an insulating material selected from the group consisting of an inorganic compound powder having an electronegativity of not less than 12.5, an inorganic compound powder having an electronegativity of less than 8.5, a metal alkoxide and a decomposition product of a metal alkoxide.
Claim 3
Dependent Claim
17 words
A core according to claim 1, characterized in that the magnetic powder comprises an iron-based magnetic material.
Claim 4
Dependent Claim
29 words
A core according to claim 2, characterized in that the magnetic powder has an average particle size of not less than 10 µm and not more than 300 pm.
Claim 5
Dependent Claim
43 words
4 . A core according to claim 1, characterized in that the insulating layer comprises the inorganic compound powder with an electronegativity of not less than 12.5, the inorganic compound powder being deposited on the surface of the magnetic powder by static electricity.
Claim 6
Dependent Claim
63 words
A core according to claim 4, characterized in that the insulating layer comprises a material selected from the group consisting of thallium oxide, bismuth oxide, manganese dioxide, boron trioxide, arsenic oxide, germanium oxide, tin oxide, silicon dioxide, tantalum oxide, niobium oxide, vanadium oxide, titanium dioxide, zirconium dioxide, molybdenum oxide, silicon nitride, titanium nitride, boron nitride, silicon carbide, titanium carbide and a mixture thereof.
Claim 7
Dependent Claim
22 words
A core according to claim 4, characterized in that the inorganic compound powder has particles having a size not exceeding 5 um.
Claim 8
Dependent Claim
16 words
A core according to claim 4, characterized in that the insulating layer contains a coupling agent.
Claim 9
Dependent Claim
39 words
A core according to claim 1, characterized in that the insulating layer comprises the inorganic compound powder having an electronegativity of less than 8.5, the inorganic compound being deposited on the surface of the magnetic powder by static electricity.
Claim 10
Dependent Claim
43 words
A core according to claim 8, characterized in that the insulating layer comprises a material selected from the group consisting of magnesium oxide, yttrium oxide, europium oxide, neodymium oxide, thulium oxide, dysprosium oxide, lanthanum oxide, cobalt oxide, nickel oxide and a mixture thereof.
Claim 11
Dependent Claim
21 words
A core according to claim 8, characterized in that the inorganic compound comprises particles having a size not exceeding 5 um.
Claim 12
Dependent Claim
26 words
A core according to claim 1, characterized in that the insulating layer comprises the metal alkoxide and/or the decomposition product thereof and forms a continuous film.
Claim 13
Dependent Claim
20 words
A core according to claim 11, characterized in that the decomposition product includes a metal oxide and/or a metal hydroxide.
Claim 14
Dependent Claim
22 words
A core according to claim 11, characterized in that the metal alkoxide has an alkyl group having 1 to 5 carbon atoms.
Claim 15
Dependent Claim
60 words
A core according to claim 13, characterized in that the metal alkoxide is selected from the group consisting of alkoxides of lithium, sodium, potassium, beryllium, magnesium, calcium, strontium, barium, titanium, zirconium, niobium, tantalum, manganese, iron, cobalt, copper, zinc, cadmium, aluminum, gallium, indium, silicon, germanium, tin, lead, arsenic, bismuth, tellurium, yttrium, lanthanum, neodymium, samarium, europium and gadolinium, and a mixture thereof.
References Cited (Backward Citations)
No citation records indexed.
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