EP0277416A2
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EP
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Permanent magnet alloy for elevated temperature applications
Assignee: Crucible Materials Corp
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Filing: 1987-11-19
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Granted: —
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Expires: 2007-11-19
Abstract
Abstract A permanent magnet alloy comprises R2Fe14B, wherein, R is a combination of rare earth elements consisting essentially of, in atomic percent, neodymium 1 to 11 and balance holmium. The alloy may include optional additions of the rare earth elements gadolinium up to 10%, perbium up to 15%, dysprosium up to 16%, erbium up to 18% and thulium up to 13%.
Inventors
- 👤 Bao-Min Ma
- 👤 K.S.V.L. Narasimhan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 17:27
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: 16
Claim 1
Independent Claim
80 words
A permanent magnet alloy characterised in comprising R₂Fe₁₄B, wherein R is a combination of rare earth elements consisting of, in atomic percent, Nd 1 to 11 and balance Ho and, optionally, up to 10% Gd, up to 15% Tb, up to 16% Dy, up to 18% Er and/or up to 13% Tm, said alloy exhibiting in combination less than -0.01% per °C over the temperature range of -50°C to 250°C and M s greater than 7500 Gauss at room temperature.
Claim 2
Dependent Claim
80 words
A permanent magnet alloy characterised in comprising R₂Fe₁₄B, wherein R is a combination of rare earth elements consisting of, in atomic percent, Nd 1 to 11 and balance Ho and, optionally, up to 10% Gd, up to 15% Tb, up to 16% Dy, up to 18% Er and/or up to 13% Tm, said alloy exhibiting in combination less than -0.01% per °C over the temperature range of -50°C to 250°C and M s greater than 7500 Gauss at room temperature.
Claim 3
Dependent Claim
13 words
An alloy according to claim 1, wherein R includes Nd 3 to 11.
Claim 4
Dependent Claim
13 words
An alloy according to claim 2, wherein R includes up to 10% Dy.
Claim 5
Dependent Claim
13 words
An alloy according to claim 2, wherein R includes up to 12% Tm.
Claim 6
Dependent Claim
16 words
An alloy according to any one of the preceding claims wherein Ho is 75 to 92%.
Claim 7
Dependent Claim
38 words
An alloy according to any one of claims 1 to 5, wherein R is a combination of rare earth elements consisting of, in atomic percent, Nd 4 to 10, Tm 0 to 13, and Ho 83 to 96.
Claim 8
Dependent Claim
37 words
An alloy according to any one of claims 1 to 5, wherein R is a combination of rare earth elements consisting of, in atomic percent, Nd 5 to 11, Er 0 to 18, Ho 76 to 94.
Claim 9
Dependent Claim
38 words
An alloy according to any one of claims 1 to 5, wherein R is a combination of rare earth elements consisting of, in atomic percent, Nd 7 to 11, Tb 9 to 12, and Ho 78 to 90.
Claim 10
Dependent Claim
38 words
An alloy according to any one of claims 1 to 5, wherein R is a combination of rare earth elements consisting of, in atomic percent, Nd 7 to 11, Dy 0 to 15 and Ho 75 to 90.
Claim 11
Dependent Claim
38 words
An alloy according to any one of claims 1 to 5, wherein R is a combination of rare earth elements consisting of, in atomic percent, Nd 7 to 11, Gd 0 to 10, and Ho 82 to 92.
Claim 12
Dependent Claim
42 words
An alloy according to any one of claims 1 to 5, wherein R is a combination of rare earth elements consisting of, in atomic percent, Nd 1 to 10, Tb 9 to 10, Gd 0 to 4 and Ho 80 to 90.
Claim 13
Dependent Claim
41 words
An alloy according to any one of claims 1 to 5, wherein R is a combination of rare earth elements consisting of, in atomic percent, Nd 6 to 10, Dy 0 to 8, Er 0 to 14, Ho 76 to 96.
Claim 14
Dependent Claim
42 words
An alloy according to any one of claims 1 to 5, wherein R is a combination of rare earth elements consisting of, in atomic percent, Nd 3 to 11, Tm 0 to 12, Er 0 to 18, and Ho 76 to 92.
Claim 15
Dependent Claim
42 words
An alloy according to any one of claims 1 to 5, wherein R is a combination of rare earth elements consisting of, in atomic percent, Nd 9 to 11, Dy 9 to 15, Tb 0 to 12 and Ho 75 to 88.
Claim 16
Dependent Claim
42 words
An alloy according to any one of claims 1 to 5, wherein R is a combination of rare earth elements consisting of, in atomic percent, Nd 8 to 12, Dy 0 to 15, Gd 0 to 8, and Ho 72 to 88.
References Cited (Backward Citations)
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