US4437882A
Expired / Lapsed
US
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Ferromagnetic powder treated with an organic silane compound
Assignee: Fujifilm Holdings Corp
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Filing: 1983-07-26
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Granted: 1984-03-20
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Expires: 2003-07-26
Abstract
Abstract A ferromagnetic powder and process for producing it are disclosed. The process involves providing reducing a nickel-doped or nickel-coated iron compound in a reducing gas to provide a reduced metal powder including nickel in an amount of 3 to 30 atomic % based on the atomic % of iron present in the reduced metal powder, and treating the reduced metal powder with an organic metal powder. The resulting ferromagnetic metal powder has excellent stability with respect to oxidation and has a high saturation magnetization.
Inventors
- 👤 Shizuo Umemura
- 👤 Akihiro Matsufuji
- 👤 Masashi Aonuma
- 👤 Tatsuji Kitamoto
- 👤 Hajime Miyatsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:05
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06; H01F1/065; B; B22; B22F; B22F1/00; B22F1/10; B22F1/102; B22F9/00; B22F9/16; B22F9/18; B22F9/20; B22F9/22; C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285; G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70605; G11B5/70615; H01F1/061
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
85 words
A ferromagnetic metal powder, produced by the process comprising the steps of: reducing an iron compound selected from the group consisting of nickel-doped iron oxyhydroxide, nickel-coated iron oxyhydroxide, nickel-doped iron oxide and nickel-coated iron oxide in a reducing gas, to provide a reduced metal powder including nickel in an amount of 3 to 30 atomic % based on the atomic % of iron present in the reduced metal powder; and treating the reduced metal powder with an organic silane compound to provide a silane-treated powder.
Claim 2
Dependent Claim
85 words
A ferromagnetic metal powder, produced by the process comprising the steps of: reducing an iron compound selected from the group consisting of nickel-doped iron oxyhydroxide, nickel-coated iron oxyhydroxide, nickel-doped iron oxide and nickel-coated iron oxide in a reducing gas, to provide a reduced metal powder including nickel in an amount of 3 to 30 atomic % based on the atomic % of iron present in the reduced metal powder; and treating the reduced metal powder with an organic silane compound to provide a silane-treated powder.
Claim 3
Dependent Claim
42 words
A ferromagnetic metal powder, produced by the process as claimed in claim 1, wherein the reduced metal powder includes nickel in an amount of 3 to 20 atomc % based on the atomic % of iron present in the reduced metal powder.
Claim 4
Dependent Claim
42 words
A ferromagnetic metal powder, produced by the process as claimed in claim 1, wherein the reduced metal powder includes nickel in an amount of 5 to 15 atomic % based on the atomic % of iron present in the reduced metal powder.
Claim 5
Dependent Claim
54 words
A ferromagnetic metal powder, produced by the process as claimed in claim 1, wherein the reduced metal powder is treated with the organic silane compound such that the amount of organic silane compound provided on the reduced metal powder ranges from 0.1 to 30 wt% based on the weight of the reduced metal powder.
Claim 6
Dependent Claim
36 words
A ferromagnetic metal powder, produced by the process as claimed in claim 1, wherein the iron compound is further comprised of an element selected from the group consisting of Co, Zn, Cu, Cr, Si and Mn.
Claim 7
Dependent Claim
34 words
A ferromagnetic metal powder, produced by the process as claimed in claim 1, wherein the organic silane compound is selected from the group consisting of silicone oil, silane coupling agents and silicic acid esters.
Claim 8
Dependent Claim
49 words
A ferromagnetic metal powder, produced by the process as claimed in claim 6, wherein the organic silane compound is selected from the group consisting of dimethyl polysiloxane, methylhydrogen polysiloxane, methylphenyl silicone oil, methyltrimethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane, methyltriethoxysilane, dimethyldimethoxysilane, diethyldimethoxysilane, dimethyldiethoxysilane, trimethylmethoxysilane, triethylmethoxysilane, vinyltriethoxysilane, allyltriethoxysilane, tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, tetrabutoxysilane and tetraphenoxysilane.
Claim 9
Dependent Claim
34 words
A ferromagnetic metal powder, produced by the process as claimed in claim 1, further comprising the step of: drying the silane-treated powder at a temperature in the range of 20° C. to 100° C.
Claim 10
Dependent Claim
85 words
A process for producing a ferromagnetic metal powder, comprising the steps of: reducing an iron compound selected from the group consisting of nickel-doped iron oxyhydroxide, nickel-coated iron oxyhydroxide, nickel-doped iron oxide and nickel-coated iron oxide in a reducing gas, to provide a reduced metal powder including nickel in an amount of 3 to 30 atomic % based on the atomic % of iron present in the reduced metal powder; and treating the reduced metal powder with an organic silane compound to provide a silane-treated powder.
Claim 11
Dependent Claim
85 words
A process for producing a ferromagnetic metal powder, comprising the steps of: reducing an iron compound selected from the group consisting of nickel-doped iron oxyhydroxide, nickel-coated iron oxyhydroxide, nickel-doped iron oxide and nickel-coated iron oxide in a reducing gas, to provide a reduced metal powder including nickel in an amount of 3 to 30 atomic % based on the atomic % of iron present in the reduced metal powder; and treating the reduced metal powder with an organic silane compound to provide a silane-treated powder.
Claim 12
Dependent Claim
41 words
A process for producing a ferromagnetic metal powder as claimed in claim 9, wherein the reduced metal powder includes nickel in an amount of 3 to 20 atomic % based on the atomic % of iron in the reduced metal powder.
Claim 13
Dependent Claim
41 words
A process for producing a ferromagnetic metal powder as claimed in claim 9, wherein the reduced metal powder includes nickel in an amount of 5 to 15 atomic % based on the atomic % of iron in the reduced metal powder.
Claim 14
Dependent Claim
54 words
A process for producing a ferromagnetic metal powder as claimed in claim 9, wherein the reduced metal powder is treated with the organic silane compound such that the amount of organic silane compound provided on the reduced metal powder ranges from 0.1 to 30 wt% based on the weight of the reduced metal powder.
Claim 15
Dependent Claim
25 words
A process for producing a ferromagnetic metal powder as claimed in claim 9, wherein the reducing is carried out utilizing hydrogen as the reducing gas.
Claim 16
Dependent Claim
36 words
A process for producing a ferromagnetic metal powder as claimed in claim 9, wherein the iron compound is further comprised of an element selected from the group consisting of Co, Zn, Cu, Cr, Si and Mn.
Claim 17
Dependent Claim
33 words
A process for producing a metal powder as claimed in claim 9, wherein the organic silane compound is selected from the group consisting of silicone oil, silane coupling agents an silicic acid esters.
Claim 18
Dependent Claim
49 words
A process for producing a ferromagnetic metal powder as claimed in claim 15, wherein the organic silane compound is selected from the group consisting of dimethyl polysiloxane, methylhydrogen polysiloxane, methylphenyl silicone oil, methyltrimethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane, methyltriethoxysilane, dimethyldimethoxysilane, diethyldimethoxysilane, dimethyldiethoxysilane, trimethylmethoxysilane, triethylmethoxysilane, vinyltriethoxysilane, allyltriethoxysilane, tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, tetrabutoxysilane and tetraphenoxysilane.
Claim 19
Dependent Claim
34 words
A process for producing a ferromagnetic metal powder as claimed in claim 9, furhter comprising the step of: drying the silane-treated powder at a temperature in the range of 20° C. to 100° C.
References Cited (Backward Citations)
US3846118A
Cited
US4043846A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |