US4540500A
Expired / Lapsed
US
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Low temperature sinterable oxide magnetic material
Assignee: FDK Corp
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Filing: 1983-02-23
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Granted: 1985-09-10
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Expires: 2003-02-23
Abstract
Abstract PCT No. PCT/JP83/00055 Sec. 371 Date Oct. 20, 1983 Sec. 102(e) Date Oct. 23, 1983 PCT Filed Feb. 23, 1983 PCT Pub. No. WO83/03094 PCT Pub. Date Sep. 15, 1983.A low temperature sinterable oxide magnetic material prepared by adding 0.1 to 5% by weight of glass containing 3 to 50 mol % of Li2O, 10 to 97 mol % of B2O3 and 0 to 70 mol % of SiO2 to ferrite containing at least 0.5 mol % of Li2O. Especially, when a glass containing 10-28 mol % of Li2O, 34 to 66 mol % of B2O3, and 15 to 45 mol % of SiO2 is used, the sintering temperature can be reduced to about 1,000 DEG C. or less.
Inventors
- 👤 Michihiro Torii
- 👤 Tomoyoshi Kosaka
- 👤 Takeo Maeda
- 👤 Hiroshi Rikukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:48
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/34; H01F1/36; H01F1/37; C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2608; C04B35/2616; C04B35/2625; C04B35/265; C04B35/622; C04B35/64
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
94 words
A method for reducing the sintering temperature of a magnetic ferrite material containing at least 0.5 mol % of Li 2 O which consists essentially of adding 0.1 to 5% by weight of a glass consisting essentially of 3 to 50 mol % of Li 2 O, 10 to 97 mol % of B 2 O 3 and 0 to 70 mol % of SiO 2 to said magnetic ferrite material prior to sintering, said glass effecting a magnetic ferrite material having a lower sintering temperature than said magnetic ferrite material absent said glass.
Claim 2
Independent Claim
94 words
A method for reducing the sintering temperature of a magnetic ferrite material containing at least 0.5 mol % of Li 2 O which consists essentially of adding 0.1 to 5% by weight of a glass consisting essentially of 3 to 50 mol % of Li 2 O, 10 to 97 mol % of B 2 O 3 and 0 to 70 mol % of SiO 2 to said magnetic ferrite material prior to sintering, said glass effecting a magnetic ferrite material having a lower sintering temperature than said magnetic ferrite material absent said glass.
Claim 3
Dependent Claim
40 words
A method according to claim 1, wherein said glass contains 10 to 28 mol % of Li 2 O, 34 to 66 mol % of B 2 O 3 , and 15 to 45 mol % of SiO 2 .
Claim 4
Dependent Claim
32 words
A method according to claim 1, wherein said ferrite contains 20 mol % of Li 2 O, 10 mol % of ZnO, and 70 mol % of Fe 2 O 3 .
Claim 5
Dependent Claim
33 words
A method according to claim 1, wherein said ferrite contains 2.6 mol % of Li 2 O, 19.0 mol % of MgO, 3.2 mol % of MnO, and 22.1 mol % of ZnO.
Claim 6
Dependent Claim
42 words
A method according to claim 1, wherein said ferrite contains 5 mol % of Li 2 O, 8 mol % of NiO, 5 mol % of CuO, 33 mol % of ZnO, and 49 mol % of Fe 2 O 3 .
References Cited (Backward Citations)
US2980617A
Cited
US3188400A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-09 | 1989-03-11 | 1989-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-09 | 1993-03-11 | 1993-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-09 | 1997-03-11 | 1997-09-10 | $7700.00 | Window Closed / Lapsed |