CH618538A5 - Sintered magnetic material - Google Patents
Sintered magnetic material Download PDFInfo
- Publication number
- CH618538A5 CH618538A5 CH1230676A CH1230676A CH618538A5 CH 618538 A5 CH618538 A5 CH 618538A5 CH 1230676 A CH1230676 A CH 1230676A CH 1230676 A CH1230676 A CH 1230676A CH 618538 A5 CH618538 A5 CH 618538A5
- Authority
- CH
- Switzerland
- Prior art keywords
- sintered
- coercive force
- sintering
- magnetic material
- value
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/07—Alloys based on nickel or cobalt based on cobalt
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/0555—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together
- H01F1/0557—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together sintered
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Power Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
La présente invention a pour objet un matériau magnétique fritté comprenant du cobalt, du fer, du cuivre et du samarium. The present invention relates to a sintered magnetic material comprising cobalt, iron, copper and samarium.
Le brevet britannique 1 266 787 divulgue un matériau magnétique ayant la formule générale (AB)XRE dans laquelle A est Co et/ou Fe, B est au moins un élément choisi parmi Cu, Ni et al, RE est un métal des terres rares et x est un nombre de 5 à 8,5. De tels matériaux peuvent être sous forme de particules frittées et ont une grande force coercitive intrinsèque (des valeurs de 1400 à 29 000 oersteds sont citées à titre d'exemple). British Patent 1,266,787 discloses a magnetic material having the general formula (AB) XRE in which A is Co and / or Fe, B is at least one element chosen from Cu, Ni et al, RE is a rare earth metal and x is a number from 5 to 8.5. Such materials can be in the form of sintered particles and have a large intrinsic coercive force (values of 1400 to 29,000 oersteds are given by way of example).
Pour qu'un aimant permanent ait un produit d'énergie élevé, le matériau doit posséder simultanément une grande force coercitive intrinsèque et une haute saturation. Pour une haute saturation, le matériau doit être pauvre en cuivre. Cependant, d'après le brevet précité, si le matériau est pauvre en cuivre, cela nuit à la force coercitive intrinsèque. Ainsi, ce brevet indique que, pour obtenir un matériau magnétique ayant un produit d'énergie et une force coercitive intrinsèque élevés, le rapport B:A doit être de 0,2 à 1,5, tandis que si le matériau est pauvre en cuivre (B:A étant inférieur à 0,2) et que le matériau contient une proportion relativement faible d'un métal des terres rares (c'est-à-dire que x est environ 8,5), la force coercitive intrinsèque est sensiblement inférieure à 1000 oersteds (voir figure 4 du brevet précité). For a permanent magnet to have a high energy product, the material must have a high intrinsic coercive force and high saturation simultaneously. For high saturation, the material must be low in copper. However, according to the aforementioned patent, if the material is poor in copper, this harms the intrinsic coercive force. Thus, this patent indicates that, in order to obtain a magnetic material having a high energy product and an intrinsic coercive force, the ratio B: A must be 0.2 to 1.5, while if the material is poor in copper (B: A being less than 0.2) and the material contains a relatively small proportion of a rare earth metal (i.e. x is about 8.5), the intrinsic coercive force is substantially less than 1000 oersteds (see Figure 4 of the aforementioned patent).
On a maintenant découvert qu'il est possible d'obtenir des matériaux magnétiques frittés compris dans la formule générale susmentionnée, qui sont pauvres en cuivre (et ont par conséquent une haute saturation) et ont néanmoins une force coercitive intrinsèque d'au moins 1900 oersteds grâce à une composition qui, abstraction faite des impuretés et des éléments fortuits, est exprimée par la formule Sm(Co1_x_yFexCuy)z, où x a la valeur 0,01 à 0,15, y la valeur 0,05 à 0,15 et z a la valeur, 7,8 à 8,2, et grâce à une grosseur moyenne du grain inférieure à 10 microns. We have now discovered that it is possible to obtain sintered magnetic materials included in the above general formula, which are poor in copper (and therefore have a high saturation) and nevertheless have an intrinsic coercive force of at least 1900 oersteds thanks to a composition which, apart from impurities and fortuitous elements, is expressed by the formula Sm (Co1_x_yFexCuy) z, where x has the value 0.01 to 0.15, y the value 0.05 to 0.15 and za the value, 7.8 to 8.2, and thanks to an average grain size less than 10 microns.
On obtient ce matériau en frittant un alliage en poudre comprenant Sm, Co, Fe et Cu dans les proportions voulues, les conditions de frittage étant telles que le matériau fritté obtenu ait une force coercitive intrinsèque d'au moins 1900 oersteds et s une grosseur moyenne du grain inférieure à 10 microns. This material is obtained by sintering a powder alloy comprising Sm, Co, Fe and Cu in the desired proportions, the sintering conditions being such that the sintered material obtained has an intrinsic coercive force of at least 1900 oersteds and s an average size. grain less than 10 microns.
De préférence, on prépare l'alliage en poudre en mélangeant Sm, Co, Fe et Cu, ainsi que 0,1 à 2% de Zn, en réduisant l'alliage en poudre fine et en comprimant la poudre avant le frittage. Comme mentionné plus haut, l'addition de zinc à m l'alliage favorise le frittage et améliore le retrait au cours du frittage. Il ne subsiste aucune quantité significative de zinc dans le matériau fritté, car pratiquement tout le zinc s'évapore durant le frittage. Preferably, the powder alloy is prepared by mixing Sm, Co, Fe and Cu, as well as 0.1 to 2% of Zn, reducing the alloy to a fine powder and compressing the powder before sintering. As mentioned above, the addition of zinc to the alloy promotes sintering and improves shrinkage during sintering. There is no significant amount of zinc remaining in the sintered material, since almost all of the zinc evaporates during sintering.
Dans la description suivante, on se réfère au dessin annexé 15 dans lequel: In the following description, reference is made to the appended drawing 15 in which:
La figure 1 est un graphique montrant la force coercitive intrinsèque (Hc) pour des échantillons frittés ayant la composition approximative: Sm(CoOi85FeOio5Cu0ilo)2en fonction de la valeur de z, à une température de frittage de 1240° C. 20 La figure 2 est un graphique montrant la force coercitive intrinsèque (Hc), la grosseur moyenne du grain et la densité relative des échantillons frittés ayant la composition approximative Sm(Co0 S5Fe0i05Cu0jl)8 o en fonction du temps de frittage à une température de frittage de 1230° C et 2S la figure 3 est un graphique montrant la force coercitive intrinsèque (Hc) pour un échantillon ayant la composition approximative: Sm(Co0i85Fe0i05Cu0il)8 0 en fonction de la température de frittage avec un temps de frittage de 30 mn. Figure 1 is a graph showing the intrinsic coercive force (Hc) for sintered samples having the approximate composition: Sm (CoOi85FeOio5Cu0ilo) 2 as a function of the value of z, at a sintering temperature of 1240 ° C. 20 Figure 2 is a graph showing the intrinsic coercive force (Hc), the average grain size and the relative density of the sintered samples having the approximate composition Sm (Co0 S5Fe0i05Cu0jl) 8 o as a function of the sintering time at a sintering temperature of 1230 ° C and 2S FIG. 3 is a graph showing the intrinsic coercive force (Hc) for a sample having the approximate composition: Sm (Co0i85Fe0i05Cu0il) 8 0 as a function of the sintering temperature with a sintering time of 30 min.
Les exemples suivants illustrent l'invention. The following examples illustrate the invention.
30 30
Exemple I Example I
On a préparé des alliages par fusion des métaux indiqués ci-après, en utilisant les métaux dans des proportions telles qu'elles 35 donnent une composition nominale de Alloys were prepared by melting the metals indicated below, using the metals in proportions such as to give a nominal composition of
Sm(Co0i85Fe0i05Cu0il0Zn0i02)80. Sm (Co0i85Fe0i05Cu0il0Zn0i02) 80.
On a pulvérisé les alliages tels que coulés en des grains grossiers puis on les a broyés en des poudres fines ayant une grosseur particulaire d'environ 3 microns par broyage au jet (jet milling). On a comprimé les poudres dans un champ magnétique de 15 kOe puis on les a encore comprimées par compression isostatique à environ 3 tonnes/cm2. On a fritté les corps ainsi comprimés sous une pression de 5 X 10~5 mm de Hg pendant 25 ou 30 mn à diverses températures comprises entre 1125 et The alloys as cast were pulverized into coarse grains and then ground into fine powders having a particle size of about 3 microns by jet milling. The powders were compressed in a 15 kOe magnetic field and then further compressed by isostatic compression to about 3 tonnes / cm2. The bodies thus compressed were sintered under a pressure of 5 × 10 -5 mm of Hg for 25 or 30 min at various temperatures between 1125 and
45 45
1260° C. 1260 ° C.
L'analyse chimique des corps frittés obtenus a montré que presque tout le Zn présent dans les alliages tels que coulés était chassé par évaporation pendant le frittage. L'addition d'une petite quantité de Zn a pour effet de favoriser le frittage et causer ainsi un meilleur retrait des échantillons, bien que les produits frittés finals ne contiennent pas une quantité appréciable de Zn. Chemical analysis of the sintered bodies obtained showed that almost all of the Zn present in the alloys as cast was removed by evaporation during sintering. The addition of a small amount of Zn has the effect of promoting sintering and thus causing better shrinkage of the samples, although the final sintered products do not contain an appreciable amount of Zn.
Des exemples des analyses chimiques sont donnés ci-des- Examples of chemical analyzes are given below.
55 55
sous: under:
Echantillon No Sample No
Sm Sm
Co Co
Fe Fe
Cu Cu
Zn Zn
Total Total
Z3 Z3
tel que coulé 24,4 as cast 24.4
62,1 62.1
3,9 3.9
8,1 8.1
1,1 1.1
99,6 99.6
Z6 Z6
tel que coulé 24,0 as cast 24.0
62,5 62.5
3,9 3.9
8,2 8.2
1,1 1.1
99,7 99.7
fritté 24,2 sintered 24.2
63,1 63.1
3,8 3.8
8,2 8.2
<0,1 <0.1
99,4 99.4
ZI 2 ZI 2
tel que coulé 23,5 as cast 23.5
62,6 62.6
4,0 4.0
8,0 8.0
1,1 1.1
99,2 99.2
Par exemple l'échantillon fritté Z6 peut être représenté par fl, erreur pouvant atteindre 0,5 %. La quantité relative de Sm par la formule: Sm(Co0i843Fe0i053Cu0101Zn0i001)7g2 si on omet les rapport au reste de la composition de ces alliages était détermi-impuretés non analysées. Cependant, l'analyse chimique pour née d'après l'intensité du rayonnement caractéristique de Sm déterminer la valeur absolue de la teneur en Sm est sujette à une par analyse fluorescente aux rayons X. La quantité relative Sm For example the sintered sample Z6 can be represented by fl, an error of up to 0.5%. The relative amount of Sm by the formula: Sm (Co0i843Fe0i053Cu0101Zn0i001) 7g2 if we omit the reports to the rest of the composition of these alloys was determi-impurities not analyzed. However, the chemical analysis for born according to the intensity of the radiation characteristic of Sm determining the absolute value of the content of Sm is subject to one by fluorescent X-ray analysis. The relative quantity Sm
t t
618 538 618,538
est dosée avec le plus de précision de cette manière et on préfère se référer à la quantité relative de Sm parce qu'on ne peut pas doser avec beaucoup de précision la valeur absolue de la teneur en Sm, comme indiqué plus haut. Les résultats sont indiqués ci-après. is dosed as precisely as possible in this way and it is preferred to refer to the relative amount of Sm because one cannot measure the absolute value of the Sm content very precisely, as indicated above. The results are shown below.
Echantillon No Sample No
Quantités relatives de Sm Relative quantities of Sm
(unités arbitraires) (arbitrary units)
Z3 Z3
1,1746 1.1746
Z4 Z4
1,1751 1.1751
Z5 Z5
1,1643 1.1643
Z6 Z6
1,1527 1.1527
Z8 Z8
1,1561 1.1561
Z9 Z9
1,1379 1.1379
ZIO ZIO
1,1472 1.1472
Z12 Z12
1,1179 1.1179
Z13 Z13
1,1443 1.1443
Z14 Z14
1,1230 1.1230
comprise entre 5000 et 8000 Oe qui est essentiellement la même que la valeur optimum de la force coercitive de l'exemple 1. between 5000 and 8000 Oe which is essentially the same as the optimum value of the coercive force of example 1.
5 Exemple 3 5 Example 3
On a préparé les échantillons Z17 à Z28 ayant une composition nominale d'approximativement: Sm(Co0j83Fe0i05Cu0jl0)W) par le procédé décrit dans l'exemple 1. La quantité relative de Sm dans les échantillons obtenus, (dosées comme dans l'exem-îo pie 1), la température de frittage, le temps de frittage et la force coercitive sont indiqués ci-après: Samples Z17 to Z28 were prepared having a nominal composition of approximately: Sm (Co0j83Fe0i05Cu0jl0) W) by the method described in example 1. The relative amount of Sm in the samples obtained, (assayed as in example îo pie 1), the sintering temperature, the sintering time and the coercive force are indicated below:
On a obtenu les meilleures valeurs de la force coercitive dans les corps frittés obtenus par frittage à environ 1240° C. The best values of coercive force have been obtained in the sintered bodies obtained by sintering at around 1240 ° C.
La figure 1 montre la variation de la force coercitive en fonction de z pour ces corps frittés Figure 1 shows the variation of the coercive force as a function of z for these sintered bodies
La figure 2 montre la force coercitive intrinsèque, la grosseur moyenne du grain et la densité des échantillons frittés obtenus, en fonction du temps de frittage à une température de frittage de 1230° C. Figure 2 shows the intrinsic coercive force, the average grain size and the density of the sintered samples obtained, as a function of the sintering time at a sintering temperature of 1230 ° C.
Exemple 2 Example 2
On a mélangé les poudres Z12 et Z4 de l'exemple 1 en le rapport approprié pour obtenir la composition Z6. On a soumis les poudres mélangées au procédé tel que décrit dans l'exemple 1 ; les corps frittés obtenus présentaient une force coercitive The powders Z12 and Z4 of Example 1 were mixed in the appropriate ratio to obtain the composition Z6. The mixed powders were subjected to the process as described in Example 1; the sintered bodies obtained exhibited a coercive force
Echantillon Sample
Quantité relative Température Temps de Relative quantity Temperature Time
IHC IHC
de Sm (unités de frittage frittage of Sm (sintering units sintering
(Oe) (Oe)
arbitraires) arbitrary)
(°C) (° C)
(mn) (min)
Z17 Z17
1,1216 1.1216
1190 1190
30 30
1900 1900
Z18 Z18
1,1567 1.1567
1140 1140
30 30
14000 14000
Z19 Z19
1,1724 1.1724
1140 1140
30 30
13800 13800
Z20 Z20
1,1372 1.1372
1140 1140
30 30
2400 2400
Comparatif Comparative
Z21 Z21
1,1822 1.1822
1140 1140
30 30
600 600
Z22 Z22
1,1563 1.1563
1140 1140
25 25
14300 14300
Z23 Z23
1,1349 1.1349
1140 1140
25 25
10600 10600
Z24 Z24
1,1292 1.1292
1140 1140
25 25
14100 14100
Z25 Z25
1,1185 1.1185
1135 1135
25 25
12000 12000
Z26 Z26
1,1363 1.1363
1140 1140
25 25
2200 2200
Z27 Z27
1,1344 1.1344
1119 1119
25 >15000 25> 15000
Z28 Z28
1,1314 1.1314
1125 1125
25 25
13600 13600
La figure 3 montre la force coercitive intrinsèque en fonction de la température de frittage pour l'échantillon Z19 avec : un temps de frittage de 30 mn. FIG. 3 shows the intrinsic coercive force as a function of the sintering temperature for the sample Z19 with: a sintering time of 30 min.
C VS
2 feuilles dessins 2 sheets of drawings
Claims (3)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50122693A JPS5246500A (en) | 1975-10-09 | 1975-10-09 | Material for permanent magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH618538A5 true CH618538A5 (en) | 1980-07-31 |
Family
ID=14842269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH1230676A CH618538A5 (en) | 1975-10-09 | 1976-09-29 | Sintered magnetic material |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5246500A (en) |
| CH (1) | CH618538A5 (en) |
| DE (1) | DE2604026B2 (en) |
| GB (1) | GB1559100A (en) |
| NL (1) | NL183685C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5797261U (en) * | 1980-12-05 | 1982-06-15 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE728414A (en) * | 1968-04-01 | 1969-07-16 | ||
| JPS5516221B2 (en) * | 1972-07-19 | 1980-04-30 | ||
| US3982971A (en) * | 1974-02-21 | 1976-09-28 | Shin-Etsu Chemical Co., Ltd | Rare earth-containing permanent magnets |
-
1975
- 1975-10-09 JP JP50122693A patent/JPS5246500A/en active Granted
-
1976
- 1976-01-15 NL NL7600389A patent/NL183685C/en not_active IP Right Cessation
- 1976-01-30 DE DE19762604026 patent/DE2604026B2/en active Granted
- 1976-07-13 GB GB2915976A patent/GB1559100A/en not_active Expired
- 1976-09-29 CH CH1230676A patent/CH618538A5/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| GB1559100A (en) | 1980-01-16 |
| NL7600389A (en) | 1977-04-13 |
| JPS5246500A (en) | 1977-04-13 |
| JPS5755281B2 (en) | 1982-11-24 |
| DE2604026A1 (en) | 1977-04-14 |
| DE2604026B2 (en) | 1980-11-13 |
| NL183685C (en) | 1988-12-16 |
| DE2604026C3 (en) | 1983-12-22 |
| NL183685B (en) | 1988-07-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PL | Patent ceased |