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US4581080A
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Magnetic head alloy material and method of producing the same
Assignee: Proterial Ltd
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Filing: 1984-06-12
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Granted: 1986-04-08
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Expires: 2004-06-12
Abstract
Abstract An alloy material for magnetic head which ensures, when formed into a head, reduced distortion during writing and reduced level of noises such as sliding noise, while presenting high wear resistance. The alloy material is produced by preparing a molten alloy having a basic composition consisting essentially of Fe and 4 to 8 wt % of Si, and further containing one or more than two additive element or elements selected from a group consisting of elements belonging in periodic table to groups IIA, IVB, VB, VIB, VIIB, VIII, IB, IIB, IIIA, IVA and VA. The molten alloy is then quenched at a high cooling rate of at least 10 3 °C./sec to become a thin sheet having a thickness ranging between 0.02 mm and 0.3 mm. The sheet is then heat-treated in a non-oxidizing atmosphere at 600° to 1200° C. for 0.01 to 20 hours, so that the mean grain size of 0.2 mm or smaller can be obtained.
Inventors
- 👤 Takashi Meguro
- 👤 Yoshizo Sawada
- 👤 Yasunobu Ogata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:34
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/02; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
A magnetic head alloy material having a basic composition consisting of Fe, 4 to 8 wt % of Si, and one or more than two additive element or elements by an amount of 0.25 to 2 wt % in total, said additive element or elements being selected from the group consisting of Ti and Ru, and said alloy material having a mean grain size of 0.2 mm or smaller.
Claim 2
Dependent Claim
69 words
A magnetic head alloy material having a basic composition consisting of Fe, 4 to 8 wt % of Si, and one or more than two additive element or elements by an amount of 0.25 to 2 wt % in total, said additive element or elements being selected from the group consisting of Ti and Ru, and said alloy material having a mean grain size of 0.2 mm or smaller.
Claim 3
Dependent Claim
72 words
A magnetic head alloy material having a basic composition consisting of Fe, 4 to 8 wt % of Si, and one or more than two additive element or elements by an amount of 0.25 to 2 wt % in total, said additive element or elements being selected from the group consisting of Be, V, Nb, Ta and Cr, and said alloy material having a mean grain size of 0.2 mm or smaller.
Claim 4
Dependent Claim
72 words
A magnetic head alloy material having a basic composition consisting of Fe, 4 to 8 wt % of Si, and one or more than two additive element or elements by an amount of 0.25 to 2 wt % in total, said additive element or elements being selected from the group consisting of Be, V, Nb, Ta and Cr, and said alloy material having a mean grain size of 0.2 mm or smaller.
Claim 5
Dependent Claim
60 words
A magnetic head alloy material having a basic composition consisting of Fe, 4 to 8 wt % of Si, and an additive by an amount of 0.25 to 2 wt % in total, said additive being selected from the group consisting of Zr-N, Cu-B and Cu-Mo, and said alloy material having a mean grain size of 0.2 mm of smaller.
Claim 6
Dependent Claim
60 words
A magnetic head alloy material having a basic composition consisting of Fe, 4 to 8 wt % of Si, and an additive by an amount of 0.25 to 2 wt % in total, said additive being selected from the group consisting of Zr-N, Cu-B and Cu-Mo, and said alloy material having a mean grain size of 0.2 mm of smaller.
Claim 7
Dependent Claim
92 words
A magnetic head alloy material having a basic composition consisting of Fe, 4 to 8 wt % of Si, and a combination of one or more than two additive element or elements to be selected from the group consisting of Ti and Ru, and one or more than two additive element or elements to be selected from the group consisting of Be, V, Nb, Ta and Cr by an amount of 0.25 to 2 wt % in total, and said alloy material having a mean grain size of 0.2 mm or smaller.
Claim 8
Dependent Claim
92 words
A magnetic head alloy material having a basic composition consisting of Fe, 4 to 8 wt % of Si, and a combination of one or more than two additive element or elements to be selected from the group consisting of Ti and Ru, and one or more than two additive element or elements to be selected from the group consisting of Be, V, Nb, Ta and Cr by an amount of 0.25 to 2 wt % in total, and said alloy material having a mean grain size of 0.2 mm or smaller.
Claim 9
Dependent Claim
72 words
A magnetic alloy material according to claim 4, wherein said alloy material is a sheet material prepared from a molten mixture of said basic composition which has been cooled at a cooling rate of 10 3 ° C./sec or higher to form said sheet with a thickness ranging between 0.02 and 0.3 mm, said sheet having been heat-treated in a non-oxidizing atmosphere at 600° to 1200° C. for 0.01 to 20 hours.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |