EP0963591A1 - Procede de fabrication de briquettes magnetiques molles a partir d'une matiere particulaire ferreuse, et elements fabriques a partir de ces briquettes - Google Patents

Procede de fabrication de briquettes magnetiques molles a partir d'une matiere particulaire ferreuse, et elements fabriques a partir de ces briquettes

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Publication number
EP0963591A1
EP0963591A1 EP98910087A EP98910087A EP0963591A1 EP 0963591 A1 EP0963591 A1 EP 0963591A1 EP 98910087 A EP98910087 A EP 98910087A EP 98910087 A EP98910087 A EP 98910087A EP 0963591 A1 EP0963591 A1 EP 0963591A1
Authority
EP
European Patent Office
Prior art keywords
particles
alloy
nickel
metal
ferrous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98910087A
Other languages
German (de)
English (en)
Other versions
EP0963591A4 (fr
Inventor
Glenn L. Beane
David S. Lashmore
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Materials Innovation Inc
Original Assignee
Materials Innovation Inc
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Filing date
Publication date
Application filed by Materials Innovation Inc filed Critical Materials Innovation Inc
Publication of EP0963591A1 publication Critical patent/EP0963591A1/fr
Publication of EP0963591A4 publication Critical patent/EP0963591A4/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/17—Metallic particles coated with metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/23—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces involving a self-propagating high-temperature synthesis or reaction sintering step
    • 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
    • H01F1/12—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 soft-magnetic materials
    • H01F1/14—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 soft-magnetic materials metals or alloys
    • H01F1/20—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 soft-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/22—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 soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps

Definitions

  • This invention relates to a method for making soft magnetic parts from particulate ferrous materials such as iron powders. More particularly, the invention relates to a method for making soft magnetic parts that have superior properties, such as increased density and improved magnetic properties due to decreased eddy current losses, etc. The invention further relates to materials and parts used in or produced by the aforementioned method.
  • Magnetic core components are frequently used in electrical/magnetic conversion devices such as generators and transformers, particularly those found in automobile engines.
  • the most important characteristics of these iron core components are their magnetic permeability and core loss characteristics.
  • the magnetic permeability is an indication of the material' s ability to become magnetized or to carry a magnetic flux. Permeability is defined as the ratio of the induced magnetic flux to the magnetizing force or field intensity. When a magnetic material is exposed to a rapidly varying field, a resultant energy loss in the core occurs.
  • These core losses are commonly divided into two types: hysteresis and eddy current losses. Hysteresis loss results from the expenditure of energy to overcome the retained magnetic forces within the iron core component.
  • stator cores have alternatively been made by stacking steel laminations which involves die stamping sheet steel to the required shape. After stamping, the laminations must be stacked in correct alignment and the stack of laminations must then be secured together, for example, by welding or riveting. In die stamping, there is however, a certain amount of scrap loss and hence unnecessary expense. Moreover, the stacked cores are known to suffer from large core losses at higher frequencies and are noisy since the laminations tend to vibrate. This vibration also contributes to energy loss.
  • U.S. Patent No. 3,670,407 to Mewhinney et al. describes such a stacked lamination stator and an attempt to reduce the eddy currents therein .
  • the present invention provides a ferromagnetic powder such as pure iron that when compressed is useful to make magnetic materials having decreased eddy currents, a process for producing soft magnetic parts for magnetic/electrical components wherein eddy current losses are decreased, and parts, such as stators made from this process.
  • the present invention provides a method for producing a part from a nickel phosphorus or cobalt phosphorus containing alloy wherein the part is made up of a non-abrasive material.
  • the ferromagnetic powder according to the present invention comprises water atomized iron core particles having from about .05 wt.% to about 5 wt . % of a substantially uniform coating of metallic material disposed thereon.
  • the metallic material has the ability to form intermetallics with the iron core when the powder is compacted and heat treated at a temperature of from about 450
  • the metallic material is an electrically resistive alloy such as, constantin
  • the layer(s) of metallic material can also be precursors to the electrically resistive alloy that upon heat treatment react to form the alloy surrounding the iron core particle.
  • the present method for producing soft magnetic parts comprises as a first step, providing a quantity of a ferromagnetic powder.
  • the powder is then substantially uniformly coated with a layer of at least one metallic material, as for example nickel, zinc or copper, with zinc being preferred.
  • the powder is coated with an electrically resistive alloy of nickel-zinc or nickel-copper.
  • This coated powder is then compressed into a desired shape or part by the application of pressure thereto.
  • the shape or part is subsequently heat treated at a temperature of from about 400 °C to about 650 °C for a time period of from about two minutes to about sixty minutes.
  • the temperature and length of time for low temperature sintering the compressed part is selected to promote formation of an intermetallic phase at the boundaries between the particles of powder and their respective coatings or in those embodiments where the powder has been coated with more than one metallic coating as for example, a coating of nickel and a second coating of copper and/or zinc, to form an alloy between the nickel and the copper or between the nickel and the zinc, respectively.
  • the powder has been coated with more than one metallic coating as for example, a coating of nickel and a second coating of copper and/or zinc, to form an alloy between the nickel and the copper or between the nickel and the zinc, respectively.
  • the metallic coatings on the particles also serve to impart lubricity to the powders while they are being compacted ⁇
  • compacts having increased green densities over what would otherwise be the green density of a compact of the uncoated iron powders. are obtained.
  • the increased density of parts made in accordance with the present invention also contributes to increased magnetic permeabilities of the resultant parts.
  • This invention also includes parts or articles for AC
  • alternating current applications such as stators
  • stators that are made from ferrous powders that have been coated with metallurgical coatings, compressed into a part and heat treated at relatively low temperature to produce insulating boundaries between the compressed iron powders.
  • boundaries are preferably highly resistive alloys or intermetallic phases between the coating metal and the iron that are formed when the temperature and time period for heating the pressed part is selected to promote the formation of same.
  • Articles or parts according to the present invention exhibit superior as pressed strength, high permeability through an extended frequency range up to 2000Hz and decreased eddy currents. Additionally, the powders according to this invention can be pressed to a relatively high green density.
  • Figure 1 is a graph showing the B vs H curves for parts made in accordance with the present invention and uncoated materials.
  • Figure 2 is a graph showing core loss vs. B for electrically resistive materials made in accordance with the present invention and materials made with uncoated iron powders .
  • the present invention is directed to a method for making soft magnetic parts from particulates of any ferromagnetic material such as nickel-cobalt, cobalt, iron, aluminum-iron, aluminum-nickel, with pure iron being preferred.
  • the method comprises as a first step providing a plurality of ferrous core particles.
  • the ferrous core particles for use in the present inventive method are preferably- high compressibility powders of iron or ferromagnetic material, preferably having a average particle size of from about 1 to about 120 microns.
  • a layer of from about 0 wt.% to about 50 wt.%, and preferably less than 2 wt.% of metal or alloy is coated onto each of the particles.
  • particles should be interpreted to include powders, whiskers, fibers, continuous wires, sheets and foils.
  • the coating step can be done by any method for coating metals known in the art such as for example, ball milling, reduction from sol-gel and plating such as electroplating.
  • the coating step is done by electroplating to ensure as uniform a layer of the metal material on each of the particles of the particulate ferrous material as possible.
  • the metal coating is that it be a true metallurgical coating.
  • any known electroplating process can be used to coat the particles in this invention.
  • a particularly preferred process for plating the layer of metal or alloy onto the particulates is one using the
  • Fluidized bed apparatus taught in U.S. Patent No. 5,603,815 to Lashmore et al. hereby incorporated in its entirety by reference herein.
  • This process comprises combining particles of a particulate substrate material and an electrolyte in an imperforate container; vibrating the container to generate a fluidized bed of the particles in the electrolyte and electrochemically depositing a coating on the particles from the reactants in the electrolyte.
  • the container should preferably be an electrically conductive container and the process is preferably an electrolytic method which includes applying an electric current through the electrolyte concurrent with the existence of the fluidized bed of particles.
  • nickel can be deposited from a sulfamate, sulfate, citrate or acetate electrolyte in the fluidized bed onto commercially available pure iron powder (Hoeganaes 1000C Fe particles of sizes ranging from about 20 ⁇ to about 150 ⁇ ) .
  • Zinc is preferably deposited from a cyanide or ammonia electrolyte
  • copper is preferably deposited from a pyrophosphate or cyanide electrolyte
  • nickel is preferably deposited -from a sulfate or sulfamate electrolyte.
  • Preferred materials for use as the plating metal or alloy can also include, but should not be limited to, cobalt, nickel, zinc, antimony, copper, hafnium, molybdenum, platinum, ruthenium, selenium, tin, gallium, gadolinium, manganese, niobium, osmium, palladium, rhenium, titanium, tantalum and zinc tin alloys.
  • cobalt nickel, zinc, antimony, copper, hafnium, molybdenum, platinum, ruthenium, selenium, tin, gallium, gadolinium, manganese, niobium, osmium, palladium, rhenium, titanium, tantalum and zinc tin alloys.
  • Another class of coatings that can be deposited are alloys that are themselves electrically resistive.
  • the choice of material to be coated on the particles should be based on the ability of the plated metal to form a substantially electrically insulating material (intermetallic or alloy) at the interfaces of the particles and the coatings after the particles are compressed and heat treated at relatively low temperatures.
  • Particularly preferred materials for use as coating materials in this embodiment are zinc, nickel, cobalt, copper, chromium, manganese and alloys of zinc and nickel and copper and nickel.
  • the coating should preferably be from about 1 wt% to about 20 wt% of the total weight of the coated powder.
  • the thickness of the plating should be thick enough to avoid porosity in the metallic layer, but thin enough not to impede the magnetic permeability of the compressed material .
  • the appropriate coating material can optionally be chosen for its ability to "lubricate” the ferrous particulates during consolidation.
  • “lubricate” is intended to mean to impart to the particles an ability to slip and slide by each other during consolidation, thereby minimizing or eliminating point to point welding of the powders during the process and maximizing the density of the pressed part and hence increase its magnetic permeability.
  • the particulates are consolidated to form a part, as for example a stator core and the part is heat treated (annealed) or bonded at a temperature of from about
  • the temperature is from about
  • the appropriate temperatures and times for heat treatment step should in general be selected to be sufficient to cause the coating material to react with the core particulate material and form intermetallic phases and/or alloys that have increased resistivity over the iron core powders. Hence, eddy current losses are minimized in the final product.
  • the coated particles are compacted to a density approximating "full density” (the density at which the compacted coated particles have at least non-interconnected porosity and preferably no porosity) .
  • full density the density at which the compacted coated particles have at least non-interconnected porosity and preferably no porosity.
  • the consolidation step is preferably done in the die cavity of a powder press.
  • powder pressing methods are known in the art of powder metallurgy.
  • the appropriate pressures to adequately consolidate these coated particles to a dense green part should preferably be from about 60,000 Ksi to about 150,000 Ksi when pressing is done on a traditional uni-axial powder press.
  • consolidation can be effected by high velocity projection (similar to thermal spraying) , roll-bonding, hot isostatic pressing (hipping) , cold isostatic pressing (cipping) , forging, extruding, coining or rolling the coated powders.
  • high velocity projection similar to thermal spraying
  • roll-bonding hot isostatic pressing (hipping)
  • cold isostatic pressing cipping
  • the method includes the optional step of heating the part at a temperature and for a time period sufficient to promote the formation of an electrically resistive alloy from the multiple layers of alloy precursor metals.
  • the alloy forms from the interdiffusion of the precursor layers and is disposed in a substantially uniform layer around particle surfaces.
  • the electrically resistive alloy should have an electrical resistance greater than about 100 ohms/mil-ft.
  • Examples of such an electrically resistive alloy include constantin (57Cu,45Ni) having an electrical resistance of 294 ohms/mil-ft, CuMn (87Cu, 13Mn) having an electrical resistance of 290 ohms/mil-ft, Invar (65Fe, 35Ni) having an electrical resistance of 485 ohms/mil-ft, chromax/chromel D
  • the metals are selected from the group consisting of copper, nickel, chromium, manganese and mixtures thereof. These metals and their appropriate percent by weight are of course, chosen to produce a layer of the aforementioned alloys.. Hence, for example, if one were to produce an electrically insulating barrier of constantin between compressed ferrous powders, a layer of copper and then nickel would be plated on the ferrous particles prior to their compaction.
  • the weight percent of the copper to nickel should be appropriate to produce the 57Cu, 43Ni composition of the final alloy.
  • the heating step should be done at a temperature of from about 400 °C to about 1000 °C for a time period of from about 5 minutes to about 60 minutes.
  • this invention further includes a stator for an alternating current generator.
  • the stator comprises a one piece, die pressed stator core having an annular yoke and a plurality of integral inner circumferentially spaced projections radiating and extending inwardly and defining slots.
  • the core is comprised of a plurality of die compressed metal coated particles of iron bound together by an electrically insulating material that surrounds each particle.
  • the insulating material is a metalloid comprised of intermetallic phases between the iron and the metal.
  • the metal should appropriately be selected from the group consisting of iron, zinc, nickel and cobalt.
  • the intermetallic phases are the reaction product obtained by exposing the die compressed metal coated particles to a temperature of from about 400 °C to about 1000 °C for a time period of from about 10 minutes to about 60 minutes when a layer of the metal is substantially uniformly disposed on each of the iron particles prior to die pressing.
  • the stator according to the present invention can further comprising a stator coil winding having conducting portions located in the slots of the annular core.
  • This invention further includes ferrous powder for use in making parts by powder metallurgy.
  • the powder comprises water-atomized non-heat treated ferrous core particles having from about 0.1 wt.% to about 10 wt.% of at least one layer of a substantially uniform coating of metallic material disposed thereon.
  • the layer defines a boundary between the ferrous core and the metallic material.
  • the metallic material has the ability to form an electrically resistive barrier at the boundary upon compaction and heat treatment of the coated core particles at a temperature of from about 400 °C to about 1000
  • the metallic material is selected from the group consisting of nickel containing boron, phosphorus or sulfur, zinc and cobalt and the electrically resistive barrier is the metalloid product of the reaction of the ferrous core with the metallic material when compaction and heat treatment is applied thereto.
  • Additives such as for example succinate ions can be added to the electrolyte and can be incorporated into the coating to increase its resistivity.
  • the electrically resistive barrier is the alloy product of interdiffusion between a first and a second layer of the layers of metallic material when compaction and heat treatment is applied thereto.
  • the present invention comprises a method for producing a part from a nickel phosphorus or cobalt phosphorus containing alloy. The method comprises providing a plurality of iron particles and disposing a layer of from about 2% to about 20% by weight of a member of the group consisting of nickel phosphorus alloys, cobalt phosphorus alloys and iron phosphorus alloys thereon. The alloy preferably has up to about 20 atomic percent phosphorus and is substantially uniformly coated onto each of said particles.
  • the particles having a layer of the phosphorus containing alloy disposed thereon are pressed at a pressure of up to about 60 tons/si into the shape of a part.
  • the pressed part is heated at a temperature of from about 400 ° to about 850 °C for a time period of from about 15 to about 60 minutes to interdiffuse the coating material into the iron particle thereby forming a part from a nickel phosphorus alloy or from a cobalt phosphorous alloy.
  • the alloy thus formed has an electrical resistivity of at least about 100 ohms/mil-ft.
  • the heat treating step should preferably be done in a reducing atmosphere.
  • a reducing atmosphere can be provided by argon gas, or by nitrogen gas containing hydrogen.
  • 1000C 1000C is coated with a layer of zinc by plating the powders with 10wt. % zinc by electrochemically depositing zinc from a cyanide solution in a vibratory fluidized bed. This serves to coat each particle with a uniform thin film of zinc.
  • a small sample, enough to create a pressed disk of about .125" thick, (approximately 3 grams) of the coated powders are charged into a 0.5 inch cylindrical die and into a 1 inch die, respectively of a uni-axial 50 ton hydraulic press (Dake 50H) and pressed at a pressure of 30 Tsi.
  • the pressed disk is removed from the die and its center is bored out creating an annular shaped structure with a hole measuring about 0.8 times the diameter centered on the diameter.
  • Two coils are wound on the disk using 24 gauge insulated copper transformer wire. Each coil has 50 turns of wire, tightly wound through the center of the annular disk. A current of 0.8 amps is applied through the first coil.
  • the second coil is connected to a 16 bit A/D converter and then to a computer to record data.
  • the current is applied by a galvanostat whose frequency response is not dependent on frequency at frequencies up to about 18 KHz.
  • the current waveform is determined by a voltage waveform across a resistor connected to a galvanostat controlled by a function generator. Waveforms are either a sine wave or a saw tooth wave at frequencies that vary from about 50 Hz to 200 Hz. The results of this is shown at 60Hz below:
  • a small sample, enough to create a pressed disk of about .125" thick, (approximately 3 grams) of the coated powders are charged into a 0.5 inch cylindrical die and into a 1 inch die, respectively of a uni-axial 50 ton hydraulic press (Dake 50H) and pressed at a pressure of 30 Tsi (tons/square inch) .
  • the pressed disk is removed from the die and its center is bored out creating an annular shaped structure with a hole measuring about 0.8 times the diameter centered on the diameter.
  • the disk is heated at 450°C for 30 minutes to form a constantin boundary between compressed iron particles.
  • Two coils are wound on the disk using 24 gauge insulated copper transformer wire. Each coil has 50 turns of wire, tightly wound through the center of the annular disk. A current of 0.8 amps is applied through the first coil.
  • the second coil is connected to a 16 bit A/D converter and then to a computer to record data.
  • the current is applied by a galvanostat whose frequency response is not dependent on frequency at frequencies up to about 18 KHz.
  • the current waveform is determined by a voltage waveform across a resistor connected to a galvanostat controlled by a function generator. Waveforms are either a sine wave or a saw tooth wave at frequencies that vary from about 50 Hz to 200 Hz. The results at 60 Hz of this is shown below:
  • a small sample, enough to create a pressed disk of about .125" thick, (approximately 3 grams) of the coated powders are charged into a 0.5 inch cylindrical die and into a 1 inch die, respectively of a uni-axial 50 ton hydraulic press (Dake 50H) and pressed at a pressure of 30 Tsi.
  • the pressed disk is removed from the die and its center is bored out creating an annular shaped structure with a hole measuring about 0.8 times the diameter centered on the diameter.
  • the disk is heated at 400 °C for 1 hour to bond the structure together
  • Two coils are wound on the disk using 24 gauge insulated copper transformer wire. Each coil has 50 turns of wire, tightly wound through the center of the annular disk. A current of 0.8 amps is applied through the first coil. The second coil is connected to a 16 bit A/D converter and then to a computer to record data. The current is applied by a galvanostat whose frequency response is not dependent on frequency -at frequencies up to about 18 KHz. The current waveform is determined by a voltage waveform across a resistor connected to a galvanostat controlled by a function generator.
  • Waveforms are either a sine wave or a saw tooth wave at frequencies that vary from about 50 Hz to 200 Hz.
  • the results of the analysis of magnetic properties are shown below:
  • a small sample, enough to create a pressed disk of about .125" thick, (approximately 3 grams) of the coated powders are charged into a 0.5 inch cylindrical die and into a 1 inch die, respectively, of a uni-axial 50 ton hydraulic press (Dake 50H) and pressed at a pressure of 30 Tsi (tons/square inch) .
  • the pressed disk is removed from the die and its center is bored out creating an annular shaped structure with a hole measuring about 0.8 times the diameter centered on the diameter.
  • the disk is heated at 180 °C for 15 minutes create a high resistivity intermetallic.
  • Two coils are wound on the disk using 24 gauge insulated copper transformer wire. Each coil has 50 turns of wire, tightly wound through the center of the annular disk. A current of 0.8 amps is applied through the first coil.
  • the second coil is connected to a 16 bit A/D converter and then to a computer to record data.
  • the current is applied by a galvanostat whose frequency response is not dependent on frequency at frequencies up to about 18 KHz.
  • the current waveform is determined by a voltage waveform across a resistor connected to a galvanostat controlled by a function generator. Waveforms are either a sine wave or a saw tooth wave at frequencies that vary from about 1 Hz to 200 Hz. The results of this measurement are shown below and in Fig. 1 showing very low (1Hz) or DC curves wherein B vs . H is plotted for uncoated and coated material respectively and Fig. 2 showing the core loss vs. B for coated and uncoated material:

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Soft Magnetic Materials (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

L'invention concerne un procédé de fabrication de briquettes magnétiques molles à partir de particules d'une matière ferreuse. Ce procédé comprend plusieurs étapes, qui consistent à se procurer une multiplicité de particules ferreuses, puis à appliquer sur chacune de ces particules une couche sensiblement uniforme d'un revêtement renfermant environ 0 % à 15 % en poids d'un métal. Les particules ainsi revêtues sont ensuite consolidées pour former une briquette, cette briquette étant chauffée à une température et pendant un laps de temps suffisants pour favoriser la formation de composés intermétalliques, entre la couche de métal et la particule ferreuse. Ces composés intermétalliques présentent une résistivité électrique supérieure à 100 ohms/mil-pieds.
EP98910087A 1997-02-28 1998-02-27 Procede de fabrication de briquettes magnetiques molles a partir d'une matiere particulaire ferreuse, et elements fabriques a partir de ces briquettes Withdrawn EP0963591A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US3941097P 1997-02-28 1997-02-28
US39410P 1997-02-28
PCT/US1998/003848 WO1998038655A1 (fr) 1997-02-28 1998-02-27 Procede de fabrication de briquettes magnetiques molles a partir d'une matiere particulaire ferreuse, et elements fabriques a partir de ces briquettes

Publications (2)

Publication Number Publication Date
EP0963591A1 true EP0963591A1 (fr) 1999-12-15
EP0963591A4 EP0963591A4 (fr) 2000-11-29

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EP98910087A Withdrawn EP0963591A4 (fr) 1997-02-28 1998-02-27 Procede de fabrication de briquettes magnetiques molles a partir d'une matiere particulaire ferreuse, et elements fabriques a partir de ces briquettes

Country Status (5)

Country Link
EP (1) EP0963591A4 (fr)
JP (1) JP2001524262A (fr)
AU (1) AU6441798A (fr)
CA (1) CA2282527A1 (fr)
WO (1) WO1998038655A1 (fr)

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JP2005307336A (ja) 2004-03-22 2005-11-04 Aisin Seiki Co Ltd 軟磁性粉末材料及び軟磁性粉末材料成形体の製造方法
DE102008062662B4 (de) * 2008-12-16 2010-08-19 H2 Ag Verfahren zum Erzeugen von Wasserstoff, Anlage zur Durchführung dieses Verfahrens sowie Schüttkörper zur Verwendung in dieser Anlage
CN110931198B (zh) * 2019-10-30 2021-09-07 宁波市普盛磁电科技有限公司 一种气雾化铁硅铝磁粉的制备方法
CN112894093B (zh) * 2021-02-03 2022-04-15 中车青岛四方机车车辆股份有限公司 一种异种钢的焊接工艺
CN113871128B (zh) * 2021-08-27 2023-07-07 深圳顺络电子股份有限公司 一种软磁合金复合材料及其制备方法

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WO1998038655A1 (fr) 1998-09-03
AU6441798A (en) 1998-09-18
CA2282527A1 (fr) 1998-09-03
JP2001524262A (ja) 2001-11-27
EP0963591A4 (fr) 2000-11-29

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