Patent US4869869A successfully refreshed from Google Patents.
US4869869A
Expired / Lapsed
US
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Method of consolidating FeNdB magnets
Assignee: Ceracon Inc
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Filing: 1988-09-26
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Granted: 1989-09-26
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Expires: 2008-09-26
Abstract
Abstract A method of treating a preform consisting essentially FeNeB alloy particles to produce a magnet having superior magnetic properties, the steps: (a) removing O 2 from the preform and applying an O 2 resistant coating to the preform surface, or removing O 2 and maintaining an O 2 -free environment, (b) heating the coated preform to elevated temperature and in a non-oxidizing atmosphere, to facilitate subsequent bonding of the particles during their consolidation, (c) providing a consolidation zone containing a grain bed and transferring the heated and coated or uncoated preform to said zone to be embedded in the grain bed, (d) applying pressure to the grain bed sufficient to be transferred via the bed and to the heated preform, thereby to consolidate the preform.
Inventors
- 👤 Raymond L. Anderson
- 👤 Joanna R. Groza
- 👤 Brian Oslin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:39
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0253; H01F41/026; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; H01F1/057; H01F1/0571; H01F1/0572
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
167 words
In the method of treating a preform consisting essentially of FeNdB alloy particles to produce a magnet having superior magnetic properties, the steps that include: (a) removing O 2 from the preform and applying an O 2 resistant coating to the preform surface, (b) heating the coated preform to elevated temperature and in a non-oxidizing atmosphere, to facilitate subsequent bonding to the particles during their consolidation, (c) providing a consolidation zone containing a grain bed and transferring the heated and coated preform to said zone to be embedded in the grain bed, (d) applying pressure to the grain bed sufficient to be transferred via the bed and to the heated preform, thereby to consolidate the preform, said application of pressure to the grain bed carried out to increase to at least one level and at rate that minimizes fracturing of the consolidated preform, said application of pressure held at said dwell level for at least several seconds and at a level of at least about 10 TSI.
Claim 2
Dependent Claim
167 words
In the method of treating a preform consisting essentially of FeNdB alloy particles to produce a magnet having superior magnetic properties, the steps that include: (a) removing O 2 from the preform and applying an O 2 resistant coating to the preform surface, (b) heating the coated preform to elevated temperature and in a non-oxidizing atmosphere, to facilitate subsequent bonding to the particles during their consolidation, (c) providing a consolidation zone containing a grain bed and transferring the heated and coated preform to said zone to be embedded in the grain bed, (d) applying pressure to the grain bed sufficient to be transferred via the bed and to the heated preform, thereby to consolidate the preform, said application of pressure to the grain bed carried out to increase to at least one level and at rate that minimizes fracturing of the consolidated preform, said application of pressure held at said dwell level for at least several seconds and at a level of at least about 10 TSI.
Claim 3
Dependent Claim
20 words
The method of claim 1 including the initial step of forming said preform by pressurizing a mass of the particles.
Claim 4
Dependent Claim
30 words
The method of claim 2 wherein said pressurizing of the particles is carried out by locating said mass of the particles within another grain bed and pressurizing said other bed.
Claim 5
Dependent Claim
44 words
The method of claim 2 wherein said pressurizing of the particles is carried out by providing a die having a cavity, locating said mass of the particles in said cavity, and providing a plunger and displacing the plunger to pressurize said mass of particles.
Claim 6
Dependent Claim
21 words
The method of claim 2 including the step of initially displacing the particles to align them in generally the same direction.
Claim 7
Dependent Claim
16 words
The method of claim 5 wherein said displacing of the particles is effected by vibrating them.
Claim 8
Dependent Claim
11 words
The method of claim 1 wherein said coating consists of glass.
Claim 9
Dependent Claim
33 words
The method of claim 1 wherein said coating consists of glass frit in a liquid carrier vehicle, and including the step of removing the liquid carrier vehicle from the coating by vacuum application.
Claim 10
Dependent Claim
27 words
The method of claim 8 wherein said heating of the glass coated preform is carried out at a temperature of between about 700° C. and 800° C.
Claim 11
Dependent Claim
17 words
The method of claim 9 wherein said heating is contained for between about 6 to 10 minutes.
Claim 12
Independent Claim
15 words
The method of one of claims 9 wherein said heating is effected by magnetic induction.
Claim 13
Dependent Claim
24 words
The method of claim 1 wherein said transfer of the heated and coated preform is carried out rapidly to pass through an air environment.
Claim 14
Dependent Claim
15 words
The method of claim 1 wherein said grain bed consists essentially of carbonaceous grain particles.
Claim 15
Dependent Claim
12 words
The method of claim 13 wherein said carbonaceous particles are resiliently compressible.
Claim 16
Dependent Claim
12 words
The method of claim 13 wherein said carbonaceous particles consist of graphite.
Claim 17
Dependent Claim
11 words
The method of claim 13 wherein said carbonaceous particles are fissured.
Claim 18
Dependent Claim
14 words
The method of claim 1 wherein said rate is between 0.1 and 0.7 TSI/sec.
Claim 19
Dependent Claim
14 words
The method of claim 1 wherein the bed consists essentially of ceramic grain particles.
Claim 20
Dependent Claim
16 words
The method of claim 1 wherein the bed consists of both ceramic and carbonaceous grain particles.
Claim 21
Dependent Claim
20 words
The method of claim 1 wherein application of pressure is held at a first dwell level up to 120 seconds.
Claim 22
Dependent Claim
45 words
The method of claim 1 including: (i) reducing said pressure application, at the end of a dwell interval at said dwell level, (ii) and again performing (a'), (b'), (c') and (d') steps corresponding to said (a), (b), (c) and (d) steps, upon the same preform.
Claim 23
Dependent Claim
161 words
In the method of treating a preform consisting of metallic alloy particles subject to rapid oxidation, the steps that includes: (a) removing O 2 from the preform and applying an O 2 resistant coating to the preform surface, (b) heating the coated preform to elevated temperature and in a non-oxidizing atmosphere, to facilitate subsequent bonding of the particles during their consolidation, (c) providing a consolidation zone containing a graphite grain bed and transferring the heated and coated preform to said zone to be embedded in the grain bed, (d) applying pressure to the grain bed sufficient to be transferred via the bed to the heated preform, thereby to consolidate the preform, said application of pressure to the grain bed carried out to increase to a dwell level at a rate that minimizes fracturing of the consolidated preform, said application of pressure held at said swell level for at least several seconds and at a level of at least about 10 TSI.
Claim 24
Dependent Claim
161 words
In the method of treating a preform consisting of metallic alloy particles subject to rapid oxidation, the steps that includes: (a) removing O 2 from the preform and applying an O 2 resistant coating to the preform surface, (b) heating the coated preform to elevated temperature and in a non-oxidizing atmosphere, to facilitate subsequent bonding of the particles during their consolidation, (c) providing a consolidation zone containing a graphite grain bed and transferring the heated and coated preform to said zone to be embedded in the grain bed, (d) applying pressure to the grain bed sufficient to be transferred via the bed to the heated preform, thereby to consolidate the preform, said application of pressure to the grain bed carried out to increase to a dwell level at a rate that minimizes fracturing of the consolidated preform, said application of pressure held at said swell level for at least several seconds and at a level of at least about 10 TSI.
Claim 25
Dependent Claim
140 words
In the method of treating a preform consisting of alloy particles, the steps that include: (a) applying a vitreous coating to the preform surface, (b) heating the coated preform to facilitate subsequent bonding of the particles during their consolidation, (c) providing a consolidation zone containing a graphite grain bed and transferring the heated and coated preform to said zone to embedded in the grain bed, (d) applying pressure to the grain bed sufficient to be transferred via the bed and coating to the heated preform, thereby to consolidate the preform, said application of pressure to the grain bed carried out to increase to a dwell level at a rate that minimizes fracturing of the consolidated preform, said application of pressure held at said dwell level for at least several seconds and at a level of at least about 10 TSI.
Claim 26
Dependent Claim
140 words
In the method of treating a preform consisting of alloy particles, the steps that include: (a) applying a vitreous coating to the preform surface, (b) heating the coated preform to facilitate subsequent bonding of the particles during their consolidation, (c) providing a consolidation zone containing a graphite grain bed and transferring the heated and coated preform to said zone to embedded in the grain bed, (d) applying pressure to the grain bed sufficient to be transferred via the bed and coating to the heated preform, thereby to consolidate the preform, said application of pressure to the grain bed carried out to increase to a dwell level at a rate that minimizes fracturing of the consolidated preform, said application of pressure held at said dwell level for at least several seconds and at a level of at least about 10 TSI.
Claim 27
Dependent Claim
17 words
The method of claim 23 wherein said coating consists of glass frit in a liquid carrier vehicle.
Claim 28
Dependent Claim
155 words
In the method of treating a preform consisting essentially of FeNdB alloy particles to produce a magnet having superior magnetic properties, the steps that include: (a) maintaining an O 2 -free environment at the preform, (b) heating the preform to elevated temperature and in a non-oxidizing atmosphere, to facilitate subsequent bonding of the particles during their consolidation, (c) providing a consolidation zone containing a grain bed and transferring the heated preform to said zone to be embedded in the grain bed, (d) applying pressure to the grain bed sufficient to be transferred via the bed and to the heated preform, thereby to consolidate the preform, said application of pressure to the grain bed carried out to increase to a dwell level or levels at a rate that minimizes fracturing of the consolidated preform, said application of pressure held at said dwell level for at least several seconds and at different pressures exceeding about 10 TSI.
Claim 29
Dependent Claim
155 words
In the method of treating a preform consisting essentially of FeNdB alloy particles to produce a magnet having superior magnetic properties, the steps that include: (a) maintaining an O 2 -free environment at the preform, (b) heating the preform to elevated temperature and in a non-oxidizing atmosphere, to facilitate subsequent bonding of the particles during their consolidation, (c) providing a consolidation zone containing a grain bed and transferring the heated preform to said zone to be embedded in the grain bed, (d) applying pressure to the grain bed sufficient to be transferred via the bed and to the heated preform, thereby to consolidate the preform, said application of pressure to the grain bed carried out to increase to a dwell level or levels at a rate that minimizes fracturing of the consolidated preform, said application of pressure held at said dwell level for at least several seconds and at different pressures exceeding about 10 TSI.
Claim 30
Dependent Claim
149 words
In the method of treating a preform consisting of metallic alloy particles subject to rapid oxidation, the steps that include: (a) maintaining an O 2 free environment at the preform, (b) heating the preform to elevated temperature and in a non-oxidizing atmosphere, to facilitate subsequent bonding of the particles during their consolidation, (c) providing a consolidation zone containing a grain bed and transferring the heated preform to said zone to be embedded in the grain bed, (d) applying pressure to the grain bed sufficient to be transferred via the bed to the heated preform, thereby to consolidate the preform, said application of pressure to the grain bed carried out to increase to a dwell level or levels at a rate that minimizes fracturing of the consolidated preform, said application of pressure held at said dwell level for at least several seconds and at different pressures exceeding about 10 TSI.
Claim 31
Dependent Claim
149 words
In the method of treating a preform consisting of metallic alloy particles subject to rapid oxidation, the steps that include: (a) maintaining an O 2 free environment at the preform, (b) heating the preform to elevated temperature and in a non-oxidizing atmosphere, to facilitate subsequent bonding of the particles during their consolidation, (c) providing a consolidation zone containing a grain bed and transferring the heated preform to said zone to be embedded in the grain bed, (d) applying pressure to the grain bed sufficient to be transferred via the bed to the heated preform, thereby to consolidate the preform, said application of pressure to the grain bed carried out to increase to a dwell level or levels at a rate that minimizes fracturing of the consolidated preform, said application of pressure held at said dwell level for at least several seconds and at different pressures exceeding about 10 TSI.
References Cited (Backward Citations)
US4808224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |