Classifications

• • 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
  • H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
  • H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
  • H01F1/0572—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes with a protective layer
• • 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
  • H01F1/0551—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 in the form of particles, e.g. rapid quenched powders or ribbon flakes
  • H01F1/0552—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 in the form of particles, e.g. rapid quenched powders or ribbon flakes with a protective layer
• • 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
  • H01F1/0558—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together bonded together
• • 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
  • H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
  • H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
  • H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
  • H01F1/0578—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together bonded together
• • 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
  • H01F1/059—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and Va elements, e.g. Sm2Fe17N2

Definitions

• the present invention relates to a process for the preparation of a product with magnetic properties, the product thus obtained and the magnets produced from this product.
• the object of the present invention is a treatment which makes it possible to obtain such products.
• the method of the invention for the preparation of a product with magnetic properties is characterized in that an an! : age A comprising at least one rare earth and at least one transition metal, with at least one element B or a compound of an element B chosen from the group comprising aluminum, bismuth, cadmium, tin, gallium, indium, lead, zinc, magnesium, silver, antimony, copper, chromium, nickel, mercury and rare earths.
• the invention also relates to a product with magnetic properties which, according to a first embodiment, is characterized in that it is in the form of a powder consisting of particles based on an alloy A comprising at least one rare earth and at least one transition metal, surrounded by a layer containing at least one element B chosen from the group comprising aluminum, bismuth, cadmium, tin, gallium, indium, lead, magnesium, silver, Tantimony, copper, chromium, nickel, mercury and rare earths, said particles being essentially of monocrystalline nature.
• the invention also covers a product with magnetic properties which, according to a second embodiment, is characterized in that it is in the form of a powder consisting of particles based on an alloy A comprising at least one earth rare and at least one transition metal, surrounded by a layer containing zinc or a mixture of zinc with at least one other element chosen from; the group comprising aluminum, bismuth, cadmium, tin, gallium, indium, ie lead, magnesium, silver, antimony, copper, chromium, nickel, mercury and rare earths, said particles being essentially monoc ⁇ stalline in nature
• alloys A whose composition can be variable as well by the nature of their constituents as by the respective proportions of these.
• These are bulk alloys, for example in the form of ingots. They are alloys comprising at least one rare earth and at least one transition metal.
• the invention also applies more particularly to the aforementioned alloys which also contain nitrogen or boron. Such alloys are well known
• rare earth is meant, for the whole of the description, the elements of the group constituted by rytt ⁇ um and the elements of the periodic classification with atomic number included inclusively between 57 and 71.
• the periodic classification of the elements to which reference is made for the entire description is that published in the Supplement to the Bulletin de la cios Chimique de France n ° 1 (January 1966).
• the rare earth of alloy A can be in particular samanum Alloy A can also comprise several rare earths among which samanum can be the majority.
• the rare earth of alloy A can also be neodymium and / or praseodyme In the case of an alloy of several rare earths, neodymium and / or praseodyme can be in the majority.
• transition elements is meant the elements of columns llla to Vlla, VIII, Ib and llb These transition elements can be more particularly here iron, cobalt or nickel.
• transition elements which may be present, in particular in combination with iron and / or cobalt, mention may be made of chromium, niobium, molybdenum, vanadium, copper, zinc, silver, platinum, gold, zirconium and hafnium.
• alloys comprising, in addition to the transition elements, alone or in combination, aluminum, silicon, sulfur, gallium and lead
• the respective proportions of rare earth, transition metal and, optionally nitrogen or boron can vary within wide proportions.
• the content of rare earth can be at least 1% (the percentages given here are atomic percentages ) and it can vary between 1 and 30%
• the nitrogen or boron content can be at least 0.5% and it can vary between 0.5 and 30%.
• alloys A mention may be made of the samanum / cobalt or sama ⁇ um / iron / nitrogen or rare earth / iron / boron alloys, the rare earth possibly being neodymium.
• alloys A which can be used more particularly in the context of the present invention, of those which have a phase, this phase possibly being predominant, of the TR2MT14B type, TR designating at least one rare earth and T designating at least one transition metal.
• the structure of the alloy A must be a crystalline structure
• Element B is chosen from the group comprising aluminum, bismuth, cadmium, tin, gallium, indium, lead, zinc, magnesium, silver, antimony, copper, chromium, nickel, mercury and rare earths. It is of course possible to use several elements B in combination in the form of alloys, in particular binary or ternary alloys. Among the elements mentioned, mention may be made more particularly of gallium, magnesium and aluminum as well as their alloys.
• the element B can be in particular neodymium, terbium, dysprosium or samanum.
• the rare earth (s) are used as an alloy with at least one element from the aforementioned group other than a rare earth.
• alloys of elements B aluminum / dysprosium, aluminum / sama ⁇ um, magnesium / aluminum alloys can be mentioned very particularly.
• aluminum / dysprosium / magnesium, magnesium / alumi ⁇ ium / sama ⁇ um Element B can be used in different forms, either, preferably, in metallic form, or in the form of a compound, for example of the oxide type or of the salt type.
• Element B can be used in mass form.
• the method of the invention consists in grinding an alloy A with at least one element B or a compound of this element B.
• the grinding can be done directly, that is to say in the absence of any liquid medium of the inert solvent type in particular, however, it would not go beyond the scope of the present invention to grind in the presence of a liquid medium. It is also possible to combine grinding in liquid medium and grinding without liquid medium in any order.
• the grinding can be done in any suitable device. capable of providing sufficient energy to obtain the powder according to the invention.
• the grinding time is determined in particular as a function of the particle size which it is desired to obtain. Generally, the aim is to obtain a powder of particle size between 1 ⁇ m and 500 ⁇ m.
• the powder grains consist of particles whose particle size is at most 50 ⁇ m and more particularly between 0.1 and 10 ⁇ m. For example, the grinding time can vary between 1 and 30 minutes.
• the grinding can be carried out while heating the mixture of alloy A-element B or composed of element B.
• the mixture obtained after grinding is subjected to one or more heat treatments at a temperature between 350 and 1000 ° C. generally under a controlled atmosphere, more particularly under argon, or under vacuum. This or these treatments make it possible to further improve the magnetic properties of the powder obtained.
• the quantity of element B mentioned above can vary within wide proportions depending in particular on the magnetic properties which it is sought to obtain for the ground product.
• the ratio R (ratio expressed by weight for the whole of the description) element B or composed of element B on alloy A is at most 12. More particularly, it can be at most 1 and again more particularly at most 0.5. According to certain embodiments, this ratio can be less than 0.1.
• the process of the invention makes it possible to obtain products in the form of powder having magnetic properties and in particular a relatively high coercivity. This is particularly true for Nd-Fe-B type alloys which, before treatment, exhibit only low coercivity.
• the process of the invention makes it possible to improve the resistance to oxidation of the alloys thus treated.
• the product is in the form of particles based on an alloy A, these particles being surrounded by a layer containing at least one element B chosen from the group comprising aluminum, bismuth, cadmium, tin, gallium, indium, lead, magnesium, silver, antimony, copper, chromium, nickel, mercury and rare earths.
• element B chosen from the group comprising aluminum, bismuth, cadmium, tin, gallium, indium, lead, magnesium, silver, antimony, copper, chromium, nickel, mercury and rare earths.
• the product is in the form of particles based on an alloy A, surrounded by a layer containing zinc or a mixture of zinc with at least one other element chosen from the group comprising aluminum. , bismuth, cadmium, tin, gallium, indium, lead, magnesium, silver, antimony, copper, chromium, nickel, mercury and rare earths
• the layer may contain an alloy of elements B based at least one rare earth and at least one other element from the group comprising aluminum, bismuth, cadmium, tin, gallium, indium, lead, magnesium, silver, l antimony, copper, chromium, nickel, mercury, the rare earth may be more particularly dysprosium or samanum and the other element more particularly aluminum.
• the layer can contain a mixture of zinc and at least one rare earth
• element B or the element mixed with zinc can be the gallium and / or aluminum.
• a characteristic of the product of the invention is that the particles are essentially of monoc ⁇ stalline nature.
• essentially of monoc ⁇ statltne nature it is meant that for a particle of the product of the invention, 10 cnstallites at most represent at least 50% of this particle.
• the peripheral layer coating the alloy may not be perfectly continuous or homogeneous.
• the products according to the invention comprise a homogeneous coating layer.
• the layer may be, at least in part, chemically bonded to the alloy
• the particles constituting the product of the invention are anisotropic or essentially anisotropic
• the invention also relates to a permanent magnet which comprises a product such as that which comes from 'be described or as obtained by the process presented above.
• the preparation of such a permanent magnet is done in a known manner for example by fnttage.
• the products of the invention are very suitable for the preparation of bonded permanent magnets.
• Such bonded magnets comprise the product as defined above in a matrix formed of a non-magnetic material based for example on glass, a polymer, a resin, such as an epoxy resin or based on a second alloy with low melting point
• Example 2 The operation is carried out under the same conditions as those of Example 1 but with an alloy A previously homogenized by heat treatment at 1100 ° C. for 24 hours and with, as element B, aluminum metal, in a ratio R Al / 0.12 alloy A.
• the results obtained are given in the table below.
• Example 2 The operation is carried out under the same conditions as those of Example 1 but with an alloy A previously homogenized by a heat treatment at 900 ° C. for 5 hours and with an R Ga / alloy A ratio of 0.2. The results obtained are given in the table below.
• Example 5 The operation is carried out under the same conditions as those of Example 1, but with an alloy A previously homogenized by heat treatment at 900 ° C. for 5 hours, with, as element B, a Gags yi s alloy and an R Ga85Dy ratio. -) 5 alloy A of 0.25. The results obtained are given in the table below.
• Example 3 The powder obtained in Example 3 is subjected to a double heat treatment (12 minutes at 900 ° C then 1 hour at 600 ° C). The results obtained are given in the table below.
• 5Fe77B8 powder has an Hc value of .4kOe.

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• Chemical & Material Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• Inorganic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Hard Magnetic Materials (AREA)
• Manufacture Of Metal Powder And Suspensions Thereof (AREA)

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• 1996
  • 1996-08-20 FR FR9610281A patent/FR2752641B1/fr not_active Expired - Fee Related
• 1997
  • 1997-08-18 EP EP97937632A patent/EP0920701A1/de not_active Ceased
  • 1997-08-18 CN CN97198269A patent/CN1251203A/zh active Pending
  • 1997-08-18 WO PCT/FR1997/001495 patent/WO1998008232A1/fr not_active Ceased
  • 1997-08-18 CA CA002263962A patent/CA2263962A1/fr not_active Abandoned
  • 1997-08-18 JP JP51046398A patent/JP2001506404A/ja active Pending
  • 1997-09-11 TW TW086113184A patent/TW412759B/zh not_active IP Right Cessation

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