US4065330A
Expired / Lapsed
US
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Wear-resistant high-permeability alloy
Assignee: Research Institute for Electromagnetic Materials
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Filing: 1977-02-22
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Granted: 1977-12-27
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Expires: 1997-02-22
Abstract
Abstract A heat treated, wear-resistant high-permeability alloy consisting of Si, Al, at least one element selected from Y and La series elements and Fe, and a heat treated, wear-resistant high-permeability alloy consisting of Si, Al, at least one element selected from Y and La series elements and Fe as main ingredients and containing at least one element selected from the group consisting of V, Nb, Ta, Cr, Mo, W, Cu, Ge, Ti, Ni, Co, Mn, Zr, Sn, Sb, Be and Pb as subingredients, have an initial permeability of more than 1,000, a maximum permeability of more than 3,000, a hardness of more than 490 (Hv) and an average grain size of smaller than 2 mm, and are particularly suitable as a magnetic material for magnetic heads in magnetic recording and reproducing systems.
Inventors
- 👤 Hakaru Masumoto
- 👤 Yuetsu Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:39
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; C; C22; C22C; C22C38/00; C22C38/02; C22C38/06; H01F1/14766; H01F1/14791
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
66 words
A heat treated, wear-resistant high-permeability alloy having an initial permeability of more than 1,000, a maximum permeability of more than 3,000, a hardness of more than 490 (Hv) and an average grain size of smaller than 2 mm, and consisting of by weight 3-13% of silicon, 3-13% of aluminum, 0.01-7% of at least one element selected from yttrium and lanthanum series elements and remainder of iron.
Claim 2
Dependent Claim
66 words
A heat treated, wear-resistant high-permeability alloy having an initial permeability of more than 1,000, a maximum permeability of more than 3,000, a hardness of more than 490 (Hv) and an average grain size of smaller than 2 mm, and consisting of by weight 3-13% of silicon, 3-13% of aluminum, 0.01-7% of at least one element selected from yttrium and lanthanum series elements and remainder of iron.
Claim 3
Dependent Claim
35 words
A heat treated, wear-resistant high-permeability alloy as defined in claim 1, wherein said lanthanum series element is selected from lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium.
Claim 4
Dependent Claim
41 words
A heat treated, wear-resistant high-permeability alloy as defined in claim 1, wherein the alloy consists of by weight 5-12% of silicon, 4-8% of aluminum, 0.05-6% of at least one element selected from yttrium and lanthanum series elements and remainder of iron.
Claim 5
Dependent Claim
152 words
A heat treated, wear-resistant high-permeability alloy having an initial permeability of more than 1,000, a maximum permeability of more than 3,000, a hardness of more than 490 (Hv) and an average grain size of smaller than 2 mm, and consisting of by weight 3-13% of silicon, 3-13% of aluminum, 0.01-7% of at least one element selected from yttrium and lanthanum series elements and remainder of iron as main ingredients and containing at least one element selected from the group consisting of 0-5% of vanadium, 0-5% of niobium, 0-5% of tantalum, 0-5% of chromium, 0-5% of molybdenum, 0-5% of tungsten, 0-5% of copper, 0-5% of germanium, 0-5% of titanium, 0-7% of nickel, 0-7% of cobalt, 0-7% of manganese, 0-3% of zirconium, 0-3% of tin, 0-3% of antimony, 0-3% of beryllium and 0- 0.3% of lead as subingredients, said subingredients in total being in a range of 0.01-7% by weight of the total alloy.
Claim 6
Dependent Claim
152 words
A heat treated, wear-resistant high-permeability alloy having an initial permeability of more than 1,000, a maximum permeability of more than 3,000, a hardness of more than 490 (Hv) and an average grain size of smaller than 2 mm, and consisting of by weight 3-13% of silicon, 3-13% of aluminum, 0.01-7% of at least one element selected from yttrium and lanthanum series elements and remainder of iron as main ingredients and containing at least one element selected from the group consisting of 0-5% of vanadium, 0-5% of niobium, 0-5% of tantalum, 0-5% of chromium, 0-5% of molybdenum, 0-5% of tungsten, 0-5% of copper, 0-5% of germanium, 0-5% of titanium, 0-7% of nickel, 0-7% of cobalt, 0-7% of manganese, 0-3% of zirconium, 0-3% of tin, 0-3% of antimony, 0-3% of beryllium and 0- 0.3% of lead as subingredients, said subingredients in total being in a range of 0.01-7% by weight of the total alloy.
Claim 7
Dependent Claim
35 words
A heat treated, wear-resistant high-permeability alloy as defined in claim 4, wherein said lanthanum series element is selected from lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium.
Claim 8
Dependent Claim
125 words
A heat treated, wear-resistant high-permeability alloy as defined in claim 4, wherein the alloy consists of by weight 5-12% of silicon, 4-8% of aluminum, 0.05-6% of at least one element selected from yttrium and lanthanum series elements and remainder of iron as main ingredients and contains at least one element selected from the group consisting of 0-4% of vanadium, 0-4% of niobium, 0-4% of tantalum, 0-4% of chromium, 0-4% of molybdenum, 0-4% of tungsten, 0-4% of copper, 0-4% of germanium, 0-4% of titanium, 0-5% of nickel, 0-5% of cobalt, 0-5% of manganese, 0-2% of zirconium, 0-2% of tin, 0-2% of antimony, 0-2% of beryllium and 0-0.2% of lead as subingredients, said subingredients in total being a range of 0.01-7% by weight of the total alloy.
Claim 9
Dependent Claim
45 words
A wear-resistant high-permeability alloy having an initial permeability of more than 1,000, a maximum permeability of more than 3,000, a high hardness and a fine grain size, and consisting of by weight 3-13% of silicon, 3-10% of aluminum, 0.01-7% of yttrium and 70-94% of iron.
Claim 10
Dependent Claim
45 words
A wear-resistant high-permeability alloy having an initial permeability of more than 1,000, a maximum permeability of more than 3,000, a high hardness and a fine grain size, and consisting of by weight 3-13% of silicon, 3-10% of aluminum, 0.01-7% of yttrium and 70-94% of iron.
Claim 11
Dependent Claim
120 words
A wear-resistant high-permeability alloy having an initial permeability of more than 1,000, a maximum permeability of more than 3,000, a high hardness and a fine grain size, and consisting of by weight 3-13% of silicon, 3-10% of aluminum, 0.01-7% of yttrium and 70-94% of iron as main ingredients and containing 0.01-7% by weight in total of at least one element selected from the group consisting of 0-5% of vanadium, 0-5% of niobium, 0-5% of tantalum, 0-5% of chromium, 0-5% of molybdenum, 0-5% of tungsten, 0-5% of copper, 0-5% of germanium, 0-5% of titanium, 0-7% of nickel, 0-7% of cobalt, 0-7% of manganese, 0-3% of zirconium, 0-3% of tin, 0-3% of antimony, 0-3% of beryllium and 0-0.3% of lead as subingredients.
Claim 12
Dependent Claim
120 words
A wear-resistant high-permeability alloy having an initial permeability of more than 1,000, a maximum permeability of more than 3,000, a high hardness and a fine grain size, and consisting of by weight 3-13% of silicon, 3-10% of aluminum, 0.01-7% of yttrium and 70-94% of iron as main ingredients and containing 0.01-7% by weight in total of at least one element selected from the group consisting of 0-5% of vanadium, 0-5% of niobium, 0-5% of tantalum, 0-5% of chromium, 0-5% of molybdenum, 0-5% of tungsten, 0-5% of copper, 0-5% of germanium, 0-5% of titanium, 0-7% of nickel, 0-7% of cobalt, 0-7% of manganese, 0-3% of zirconium, 0-3% of tin, 0-3% of antimony, 0-3% of beryllium and 0-0.3% of lead as subingredients.
Claim 13
Dependent Claim
45 words
A wear-resistant high-permeability alloy having an initial permeability of more than 1,000, a maximum permeability of more than 3,000, a high hardness and a fine grain size, and consisting of by weight 3-13% of silicon, 3-13% of aluminum, 0.01-7% of cerium and remainder of iron.
Claim 14
Dependent Claim
45 words
A wear-resistant high-permeability alloy having an initial permeability of more than 1,000, a maximum permeability of more than 3,000, a high hardness and a fine grain size, and consisting of by weight 3-13% of silicon, 3-13% of aluminum, 0.01-7% of cerium and remainder of iron.
Claim 15
Dependent Claim
120 words
A wear-resistant high-permeability alloy having an initial permeability of more than 1,000, a maximum permeability of more than 3,000, a high hardness and a fine grain size, and consisting of by weight 3-13% of silicon, 3-13% of aluminum, 0.01-7% of cerium and remainder of iron as main ingredients and containing 0.01-7% by weight in total of at least one element selected from the group consisting of 0-5% of vanadium, 0-5% of niobium, 0-5% of tantalum, 0-5% of chromium, 0-5% of molybdenum, 0-5% of tungsten, 0-5% of copper, 0-5% of germanium, 0-5% of titanium, 0-7% of nickel, 0-7% of cobalt, 0-7% of manganese, 0-3% of zirconium, 0-3% of tin, 0-3% of antimony, 0-3% of beryllium and 0-0.3% of lead as subingredients.
Claim 16
Dependent Claim
120 words
A wear-resistant high-permeability alloy having an initial permeability of more than 1,000, a maximum permeability of more than 3,000, a high hardness and a fine grain size, and consisting of by weight 3-13% of silicon, 3-13% of aluminum, 0.01-7% of cerium and remainder of iron as main ingredients and containing 0.01-7% by weight in total of at least one element selected from the group consisting of 0-5% of vanadium, 0-5% of niobium, 0-5% of tantalum, 0-5% of chromium, 0-5% of molybdenum, 0-5% of tungsten, 0-5% of copper, 0-5% of germanium, 0-5% of titanium, 0-7% of nickel, 0-7% of cobalt, 0-7% of manganese, 0-3% of zirconium, 0-3% of tin, 0-3% of antimony, 0-3% of beryllium and 0-0.3% of lead as subingredients.
Claim 17
Dependent Claim
45 words
A wear-resistant high-permeability alloy having an initial permeability of more than 1,000, a maximum permeability of more than 3,000, a high hardness and a fine grain size, and consisting of by weight 3-13% of silicon, 3-13% of aluminum, 0.01-7% of lanthanum and remainder of iron.
Claim 18
Dependent Claim
45 words
A wear-resistant high-permeability alloy having an initial permeability of more than 1,000, a maximum permeability of more than 3,000, a high hardness and a fine grain size, and consisting of by weight 3-13% of silicon, 3-13% of aluminum, 0.01-7% of lanthanum and remainder of iron.
Claim 19
Dependent Claim
120 words
A wear-resistant high-permeability alloy having an initial permeability of more than 1,000, a maximum permeability of more than 3,000, a high hardness and a fine grain size, and consisting of by weight 3-13% of silicon, 3-13% of aluminum, 0.01-7% of lanthanum and remainder of iron as main ingredients and containing 0.01-7% by weight in total of at least one element selected from the group consisting of 0-5% of vanadium, 0-5% of niobium, 0-5% of tantalum, 0-5% of chromium, 0-5% of molybdenum, 0-5% of tungsten, 0-5% of copper, 0-5% of germanium, 0-5% of titanium, 0-7% of nickel, 0-7% of cobalt, 0-7% of manganese, 0-3% of zircnoum, 0-3% of tin, 0-3% of antimony, 0-3% of beryllium and 0-0.3% of lead as subingredients.
Claim 20
Dependent Claim
120 words
A wear-resistant high-permeability alloy having an initial permeability of more than 1,000, a maximum permeability of more than 3,000, a high hardness and a fine grain size, and consisting of by weight 3-13% of silicon, 3-13% of aluminum, 0.01-7% of lanthanum and remainder of iron as main ingredients and containing 0.01-7% by weight in total of at least one element selected from the group consisting of 0-5% of vanadium, 0-5% of niobium, 0-5% of tantalum, 0-5% of chromium, 0-5% of molybdenum, 0-5% of tungsten, 0-5% of copper, 0-5% of germanium, 0-5% of titanium, 0-7% of nickel, 0-7% of cobalt, 0-7% of manganese, 0-3% of zircnoum, 0-3% of tin, 0-3% of antimony, 0-3% of beryllium and 0-0.3% of lead as subingredients.
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) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |