US4402770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hard magnetic alloys of a transition metal and lanthanide
Assignee: United States Department of the Navy
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Filing: 1981-10-23
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Granted: 1983-09-06
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Expires: 2001-10-23
Abstract
Abstract A hard magnetic alloy comprises iron, boron, lanthanum, and a lanthanide and is prepared by heating the corresponding amorphous alloy to a temperature from about 850 to 1200 K. in an inert atmosphere until a polycrystalline multiphase alloy with an average grain size not exceeding 400 A is formed.
Inventors
- 👤 Norman C. Koon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:47
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; H01F1/057
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
124 words
An alloy represented by the formula: (M.sub.w X.sub.x B.sub.1-w-x).sub.1-y (R.sub.z La.sub.1-z).sub.y wherein w is from about 0.7 to about 0.9; x is from 0 to about 0.05; y is from about 0.05 to about 0.15; z is from 0 to about 0.95; M is selected from the class consisting of iron, cobalt, an iron-cobalt alloy, an iron-manganese alloy having at least 50 atomic percent iron, an iron-cobalt-manganese alloy having at least 50 atomic percent iron and cobalt, X is an auxillary glass former selected from the class consisting of phosphorous, silicon, aluminum, arsenic, germanium, indium, antimony, bismuth, tin, and mixtures thereof, and R is a lanthanide, said alloy having a polycrystalline, multiphase, single-domain-particle microstructure wherein the average crystal-grain size does not exceed 400 A.
Claim 2
Dependent Claim
124 words
An alloy represented by the formula: (M.sub.w X.sub.x B.sub.1-w-x).sub.1-y (R.sub.z La.sub.1-z).sub.y wherein w is from about 0.7 to about 0.9; x is from 0 to about 0.05; y is from about 0.05 to about 0.15; z is from 0 to about 0.95; M is selected from the class consisting of iron, cobalt, an iron-cobalt alloy, an iron-manganese alloy having at least 50 atomic percent iron, an iron-cobalt-manganese alloy having at least 50 atomic percent iron and cobalt, X is an auxillary glass former selected from the class consisting of phosphorous, silicon, aluminum, arsenic, germanium, indium, antimony, bismuth, tin, and mixtures thereof, and R is a lanthanide, said alloy having a polycrystalline, multiphase, single-domain-particle microstructure wherein the average crystal-grain size does not exceed 400 A.
Claim 3
Dependent Claim
13 words
The alloy of claim 1 wherein M is iron and x is zero.
Claim 4
Dependent Claim
29 words
The alloy of claim 2 wherein R is selected from the class consisting of samarium, terbium, dysprosium, holmium, erbium and mixtures thereof and z is from 0.4 to 0.75.
Claim 5
Dependent Claim
27 words
The alloy of claim 2 wherein R is selected from the class consisting of terbium, dysprosium, holmium and mixtures thereof and z is from 0.5 to 0.75.
Claim 6
Dependent Claim
12 words
The alloy of claim 3 wherein w is from 0.74 to 0.86.
Claim 7
Dependent Claim
12 words
The alloy of claim 5 wherein w is from 0.78 to 0.84.
Claim 8
Dependent Claim
12 words
The alloy of claim 2 wherein a is from 0.30 to 0.75.
Claim 9
Dependent Claim
12 words
The alloy of claim 7 wherein z is from 0.4 to 0.75.
Claim 10
Dependent Claim
16 words
The alloy of claim 7 wherein x is 0 and y is from 0.08 to 0.12.
Claim 11
Dependent Claim
26 words
The alloy of claim 1 wherein M is cobalt and R is selected from the class consisting of samarium, terbium, dysprosium, holmium, erbium and mixtures thereof.
Claim 12
Dependent Claim
25 words
The alloy of claim 10 wherein w is from 0.72 to 0.86, z is from 0.3 to 0.75, and y is from 0.05 to 0.10.
Claim 13
Dependent Claim
9 words
The alloy of claim 11 wherein x is 0.
Claim 14
Dependent Claim
21 words
The alloy of claim 1 wherein M represents Fe a Co 1-a and a is from about 0.01 to about 0.99.
Claim 15
Dependent Claim
29 words
The alloy of claim 13 wherein R is selected from the class consisting of samarium, terbium, dysprosium, holmium, erbium and mixtures thereof and a is from 0.3 to 0.75.
Claim 16
Dependent Claim
24 words
The alloy of claim 14 wherein x is zero and R is selected from the class consisting of terbium, dysprosium, holmium, and mixtures thereof.
Claim 17
Dependent Claim
15 words
The alloy of claim 1 wherein M represents the formula Fe b Mn1-b wherein 0.5≦b<1.0.
Claim 18
Dependent Claim
7 words
The alloy of claim 16 wherein 0.7≦b<0.95.
Claim 19
Dependent Claim
15 words
The alloy of claim 1 wherein M represents Fe d Co e Mn 1-e .
Claim 20
Dependent Claim
9 words
The alloy of claim 18 wherein 0.75≦(d+e)≦0.95 and d>2e.
Claim 21
Dependent Claim
24 words
The alloy of claim 18 wherein R is selected from the class consisting of samarium, terbium, dysprosium, holmium, and erbium and x is zero.
Claim 22
Dependent Claim
24 words
The alloy of claim 19 wherein R is selected from the class consisting of terbium, dysprosium, holmium, and mixtures thereof and x is zero.
Claim 23
Dependent Claim
30 words
The alloy of claims 1, 10, 11, 13, 14, 15, 16, 17, 18, or 19 wherein x is selected from the class consisting of phosphorus, silicon, aluminum, and mixtures thereof.
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) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |