A new class of Sm-TM magnets for operating temperatures up to 550°C
Identifieur interne :
000E31 ( Pascal/Curation );
précédent :
000E30;
suivant :
000E32
A new class of Sm-TM magnets for operating temperatures up to 550°C
Auteurs : Marlin S. Walmer ;
Christina H. Chen [
États-Unis] ;
Michael H. Walmer [
États-Unis]
Source :
-
IEEE transactions on magnetics [ 0018-9464 ] ; 2000.
RBID : Pascal:01-0231959
Descripteurs français
- Pascal (Inist)
- Aimant permanent,
Samarium alliage,
Thulium alliage,
Haute température,
Désaimantation,
Propriété magnétique,
Caractéristique magnétique,
Comportement haute température,
Champ coercitif,
Perte magnétique,
Etude expérimentale,
7550W.
English descriptors
- KwdEn :
- Coercive force,
Demagnetization,
Experimental study,
High temperature,
High temperature service behaviour,
Iron loss,
Magnetic properties,
Magnetization curve,
Permanent magnets,
Samarium alloys,
Thulium alloys.
Abstract
A breakthrough has been made for magnets to be used at high temperatures. A new class of Sm(CowFevCuxZry)z type magnets with linear demagnetization curves up to 550°C has been developed. A new symbol, TM, is introduced, which is defined as the maximum temperature at which the induction demagnetization curve of a magnet is a straight line. Magnet in this class can be made with its own unique TM. There is a direct relationship between the optimum Co content and TM. An equation has been established to relate the Co content and the TM. Using the equation, magnets can be provided with the best combination of highest (BH)max and a linear demagnetization curve for any application with a specified operating temperature. These magnets have high resistance to thermal demagnetization because of their low temperature coefficients of He which result in a higher iHc at high temperature. Thermal stability of these magnets at 300-550°C has been studied, showing that the loss due to metallurgical changes is <2% for new magnets at 550°C for 360 hr. Experiment confirms that coated magnets can be expected to have considerable life expectancy and relatively low magnetic losses at the intended TM. Experiment also shows that, at high temperatures, the magnetic pinning strength in the magnets increases as the TM increases. TEM microstructures for some magnets have been studied. Magnets with higher TM have smaller cell sizes and larger volume of cell boundaries than conventional 2:17 magnets. It is believed that the large volume of cell boundaries plays a role in the high resistance to thermal demagnetization.
| pA |
| A01 | 01 | 1 | | @0 0018-9464 |
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| A02 | 01 | | | @0 IEMGAQ |
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| A03 | | 1 | | @0 IEEE trans. magn. |
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| A05 | | | | @2 36 |
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| A06 | | | | @2 5 @3 PART1 |
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| A08 | 01 | 1 | ENG | @1 A new class of Sm-TM magnets for operating temperatures up to 550°C |
|---|
| A09 | 01 | 1 | ENG | @1 Selected papers from the 2000 International Magnetics Conference (INTERMAG 2000), Toronto, Ontario, Canada, April 9-12, 2000 |
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| A11 | 01 | 1 | | @1 WALMER (Marlin S.) |
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| A11 | 02 | 1 | | @1 CHEN (Christina H.) |
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| A11 | 03 | 1 | | @1 WALMER (Michael H.) |
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| A14 | 01 | | | @1 Electron Energy Corporation @2 Landisville, PA 17538 @3 USA @Z 2 aut. @Z 3 aut. |
|---|
| A18 | 01 | 1 | | @1 IEEE @3 INT @9 patr. |
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| A20 | | | | @1 3376-3381 |
|---|
| A21 | | | | @1 2000 |
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| A23 | 01 | | | @0 ENG |
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| A43 | 01 | | | @1 INIST @2 222H6 @5 354000098009633680 |
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| A44 | | | | @0 0000 @1 © 2001 INIST-CNRS. All rights reserved. |
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| A45 | | | | @0 21 ref. |
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| A47 | 01 | 1 | | @0 01-0231959 |
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| A60 | | | | @1 P @2 C |
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| A61 | | | | @0 A |
|---|
| A64 | 01 | 1 | | @0 IEEE transactions on magnetics |
|---|
| A66 | 01 | | | @0 USA |
|---|
| C01 | 01 | | ENG | @0 A breakthrough has been made for magnets to be used at high temperatures. A new class of Sm(CowFevCuxZry)z type magnets with linear demagnetization curves up to 550°C has been developed. A new symbol, TM, is introduced, which is defined as the maximum temperature at which the induction demagnetization curve of a magnet is a straight line. Magnet in this class can be made with its own unique TM. There is a direct relationship between the optimum Co content and TM. An equation has been established to relate the Co content and the TM. Using the equation, magnets can be provided with the best combination of highest (BH)max and a linear demagnetization curve for any application with a specified operating temperature. These magnets have high resistance to thermal demagnetization because of their low temperature coefficients of He which result in a higher iHc at high temperature. Thermal stability of these magnets at 300-550°C has been studied, showing that the loss due to metallurgical changes is <2% for new magnets at 550°C for 360 hr. Experiment confirms that coated magnets can be expected to have considerable life expectancy and relatively low magnetic losses at the intended TM. Experiment also shows that, at high temperatures, the magnetic pinning strength in the magnets increases as the TM increases. TEM microstructures for some magnets have been studied. Magnets with higher TM have smaller cell sizes and larger volume of cell boundaries than conventional 2:17 magnets. It is believed that the large volume of cell boundaries plays a role in the high resistance to thermal demagnetization. |
|---|
| C02 | 01 | 3 | | @0 001B70E50W |
|---|
| C03 | 01 | 3 | FRE | @0 Aimant permanent @5 01 |
|---|
| C03 | 01 | 3 | ENG | @0 Permanent magnets @5 01 |
|---|
| C03 | 02 | 3 | FRE | @0 Samarium alliage @5 02 |
|---|
| C03 | 02 | 3 | ENG | @0 Samarium alloys @5 02 |
|---|
| C03 | 03 | 3 | FRE | @0 Thulium alliage @5 03 |
|---|
| C03 | 03 | 3 | ENG | @0 Thulium alloys @5 03 |
|---|
| C03 | 04 | X | FRE | @0 Haute température @5 04 |
|---|
| C03 | 04 | X | ENG | @0 High temperature @5 04 |
|---|
| C03 | 04 | X | SPA | @0 Alta temperatura @5 04 |
|---|
| C03 | 05 | 3 | FRE | @0 Désaimantation @5 05 |
|---|
| C03 | 05 | 3 | ENG | @0 Demagnetization @5 05 |
|---|
| C03 | 06 | 3 | FRE | @0 Propriété magnétique @5 06 |
|---|
| C03 | 06 | 3 | ENG | @0 Magnetic properties @5 06 |
|---|
| C03 | 07 | X | FRE | @0 Caractéristique magnétique @5 07 |
|---|
| C03 | 07 | X | ENG | @0 Magnetization curve @5 07 |
|---|
| C03 | 07 | X | SPA | @0 Característica magnética @5 07 |
|---|
| C03 | 08 | X | FRE | @0 Comportement haute température @5 08 |
|---|
| C03 | 08 | X | ENG | @0 High temperature service behaviour @5 08 |
|---|
| C03 | 08 | X | SPA | @0 Comportamiento alta temperatura @5 08 |
|---|
| C03 | 09 | X | FRE | @0 Champ coercitif @5 09 |
|---|
| C03 | 09 | X | ENG | @0 Coercive force @5 09 |
|---|
| C03 | 09 | X | SPA | @0 Campo coercitivo @5 09 |
|---|
| C03 | 10 | X | FRE | @0 Perte magnétique @5 10 |
|---|
| C03 | 10 | X | ENG | @0 Iron loss @5 10 |
|---|
| C03 | 10 | X | SPA | @0 Pérdida magnética @5 10 |
|---|
| C03 | 11 | 3 | FRE | @0 Etude expérimentale @5 23 |
|---|
| C03 | 11 | 3 | ENG | @0 Experimental study @5 23 |
|---|
| C03 | 12 | 3 | FRE | @0 7550W @2 PAC @4 INC @5 95 |
|---|
| N21 | | | | @1 162 |
|---|
|
|---|
| pR |
| A30 | 01 | 1 | ENG | @1 Annual IEEE International Magnetics Conference (INTERMAG) @2 37 @3 Toronto, ON CAN @4 2000-04-09 |
|---|
|
|---|
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Le document en format XML
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<author><name sortKey="Walmer, Marlin S" sort="Walmer, Marlin S" uniqKey="Walmer M" first="Marlin S." last="Walmer">Marlin S. Walmer</name>
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</publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">A new class of Sm-TM magnets for operating temperatures up to 550°C</title>
<author><name sortKey="Walmer, Marlin S" sort="Walmer, Marlin S" uniqKey="Walmer M" first="Marlin S." last="Walmer">Marlin S. Walmer</name>
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</seriesStmt><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Coercive force</term>
<term>Demagnetization</term>
<term>Experimental study</term>
<term>High temperature</term>
<term>High temperature service behaviour</term>
<term>Iron loss</term>
<term>Magnetic properties</term>
<term>Magnetization curve</term>
<term>Permanent magnets</term>
<term>Samarium alloys</term>
<term>Thulium alloys</term>
</keywords><keywords scheme="Pascal" xml:lang="fr"><term>Aimant permanent</term>
<term>Samarium alliage</term>
<term>Thulium alliage</term>
<term>Haute température</term>
<term>Désaimantation</term>
<term>Propriété magnétique</term>
<term>Caractéristique magnétique</term>
<term>Comportement haute température</term>
<term>Champ coercitif</term>
<term>Perte magnétique</term>
<term>Etude expérimentale</term>
<term>7550W</term>
</keywords><front><div type="abstract" xml:lang="en">A breakthrough has been made for magnets to be used at high temperatures. A new class of Sm(Co<sub>w</sub>
Fe<sub>v</sub>
Cu<sub>x</sub>
Zr<sub>y</sub>
)<sub>z</sub>
type magnets with linear demagnetization curves up to 550°C has been developed. A new symbol, T<sub>M</sub>
, is introduced, which is defined as the maximum temperature at which the induction demagnetization curve of a magnet is a straight line. Magnet in this class can be made with its own unique T<sub>M</sub>
. There is a direct relationship between the optimum Co content and T<sub>M</sub>
. An equation has been established to relate the Co content and the T<sub>M</sub>
. Using the equation, magnets can be provided with the best combination of highest (BH)<sub>max</sub>
and a linear demagnetization curve for any application with a specified operating temperature. These magnets have high resistance to thermal demagnetization because of their low temperature coefficients of He which result in a higher <sub>i</sub>
H<sub>c</sub>
at high temperature. Thermal stability of these magnets at 300-550°C has been studied, showing that the loss due to metallurgical changes is <2% for new magnets at 550°C for 360 hr. Experiment confirms that coated magnets can be expected to have considerable life expectancy and relatively low magnetic losses at the intended T<sub>M</sub>
. Experiment also shows that, at high temperatures, the magnetic pinning strength in the magnets increases as the T<sub>M</sub>
increases. TEM microstructures for some magnets have been studied. Magnets with higher T<sub>M</sub>
have smaller cell sizes and larger volume of cell boundaries than conventional 2:17 magnets. It is believed that the large volume of cell boundaries plays a role in the high resistance to thermal demagnetization.</div><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0018-9464</s0>
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</fA06><fA08 i1="01" i2="1" l="ENG"><s1>A new class of Sm-TM magnets for operating temperatures up to 550°C</s1>
</fA08><fA09 i1="01" i2="1" l="ENG"><s1>Selected papers from the 2000 International Magnetics Conference (INTERMAG 2000), Toronto, Ontario, Canada, April 9-12, 2000</s1>
</fA09><fA11 i1="01" i2="1"><s1>WALMER (Marlin S.)</s1>
</fA11><fA11 i1="02" i2="1"><s1>CHEN (Christina H.)</s1>
</fA11><fA11 i1="03" i2="1"><s1>WALMER (Michael H.)</s1>
</fA11><fA14 i1="01"><s1>Electron Energy Corporation</s1>
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<s3>USA</s3>
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<sZ>3 aut.</sZ>
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</fA47><fA60><s1>P</s1>
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</fA60><fA64 i1="01" i2="1"><s0>IEEE transactions on magnetics</s0>
</fA64><fA66 i1="01"><s0>USA</s0>
</fA66><fC01 i1="01" l="ENG"><s0>A breakthrough has been made for magnets to be used at high temperatures. A new class of Sm(Co<sub>w</sub>
Fe<sub>v</sub>
Cu<sub>x</sub>
Zr<sub>y</sub>
)<sub>z</sub>
type magnets with linear demagnetization curves up to 550°C has been developed. A new symbol, T<sub>M</sub>
, is introduced, which is defined as the maximum temperature at which the induction demagnetization curve of a magnet is a straight line. Magnet in this class can be made with its own unique T<sub>M</sub>
. There is a direct relationship between the optimum Co content and T<sub>M</sub>
. An equation has been established to relate the Co content and the T<sub>M</sub>
. Using the equation, magnets can be provided with the best combination of highest (BH)<sub>max</sub>
and a linear demagnetization curve for any application with a specified operating temperature. These magnets have high resistance to thermal demagnetization because of their low temperature coefficients of He which result in a higher <sub>i</sub>
H<sub>c</sub>
at high temperature. Thermal stability of these magnets at 300-550°C has been studied, showing that the loss due to metallurgical changes is <2% for new magnets at 550°C for 360 hr. Experiment confirms that coated magnets can be expected to have considerable life expectancy and relatively low magnetic losses at the intended T<sub>M</sub>
. Experiment also shows that, at high temperatures, the magnetic pinning strength in the magnets increases as the T<sub>M</sub>
increases. TEM microstructures for some magnets have been studied. Magnets with higher T<sub>M</sub>
have smaller cell sizes and larger volume of cell boundaries than conventional 2:17 magnets. It is believed that the large volume of cell boundaries plays a role in the high resistance to thermal demagnetization.</s0><fC02 i1="01" i2="3"><s0>001B70E50W</s0>
</fC02><fC03 i1="01" i2="3" l="FRE"><s0>Aimant permanent</s0>
<s5>01</s5>
</fC03><fC03 i1="01" i2="3" l="ENG"><s0>Permanent magnets</s0>
<s5>01</s5>
</fC03><fC03 i1="02" i2="3" l="FRE"><s0>Samarium alliage</s0>
<s5>02</s5>
</fC03><fC03 i1="02" i2="3" l="ENG"><s0>Samarium alloys</s0>
<s5>02</s5>
</fC03><fC03 i1="03" i2="3" l="FRE"><s0>Thulium alliage</s0>
<s5>03</s5>
</fC03><fC03 i1="03" i2="3" l="ENG"><s0>Thulium alloys</s0>
<s5>03</s5>
</fC03><fC03 i1="04" i2="X" l="FRE"><s0>Haute température</s0>
<s5>04</s5>
</fC03><fC03 i1="04" i2="X" l="ENG"><s0>High temperature</s0>
<s5>04</s5>
</fC03><fC03 i1="04" i2="X" l="SPA"><s0>Alta temperatura</s0>
<s5>04</s5>
</fC03><fC03 i1="05" i2="3" l="FRE"><s0>Désaimantation</s0>
<s5>05</s5>
</fC03><fC03 i1="05" i2="3" l="ENG"><s0>Demagnetization</s0>
<s5>05</s5>
</fC03><fC03 i1="06" i2="3" l="FRE"><s0>Propriété magnétique</s0>
<s5>06</s5>
</fC03><fC03 i1="06" i2="3" l="ENG"><s0>Magnetic properties</s0>
<s5>06</s5>
</fC03><fC03 i1="07" i2="X" l="FRE"><s0>Caractéristique magnétique</s0>
<s5>07</s5>
</fC03><fC03 i1="07" i2="X" l="ENG"><s0>Magnetization curve</s0>
<s5>07</s5>
</fC03><fC03 i1="07" i2="X" l="SPA"><s0>Característica magnética</s0>
<s5>07</s5>
</fC03><fC03 i1="08" i2="X" l="FRE"><s0>Comportement haute température</s0>
<s5>08</s5>
</fC03><fC03 i1="08" i2="X" l="ENG"><s0>High temperature service behaviour</s0>
<s5>08</s5>
</fC03><fC03 i1="08" i2="X" l="SPA"><s0>Comportamiento alta temperatura</s0>
<s5>08</s5>
</fC03><fC03 i1="09" i2="X" l="FRE"><s0>Champ coercitif</s0>
<s5>09</s5>
</fC03><fC03 i1="09" i2="X" l="ENG"><s0>Coercive force</s0>
<s5>09</s5>
</fC03><fC03 i1="09" i2="X" l="SPA"><s0>Campo coercitivo</s0>
<s5>09</s5>
</fC03><fC03 i1="10" i2="X" l="FRE"><s0>Perte magnétique</s0>
<s5>10</s5>
</fC03><fC03 i1="10" i2="X" l="ENG"><s0>Iron loss</s0>
<s5>10</s5>
</fC03><fC03 i1="10" i2="X" l="SPA"><s0>Pérdida magnética</s0>
<s5>10</s5>
</fC03><fC03 i1="11" i2="3" l="FRE"><s0>Etude expérimentale</s0>
<s5>23</s5>
</fC03><fC03 i1="11" i2="3" l="ENG"><s0>Experimental study</s0>
<s5>23</s5>
</fC03><fC03 i1="12" i2="3" l="FRE"><s0>7550W</s0>
<s2>PAC</s2>
<s4>INC</s4>
<s5>95</s5>
</fC03><fN21><s1>162</s1>
</fN21><pR><fA30 i1="01" i2="1" l="ENG"><s1>Annual IEEE International Magnetics Conference (INTERMAG)</s1>
<s2>37</s2>
<s3>Toronto, ON CAN</s3>
<s4>2000-04-09</s4>
</fA30>
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