EP3541550A1 - Composition de poudre frittable magnetique et objets tridimensionnels fabriques par frittage d'une telle composition - Google Patents
Composition de poudre frittable magnetique et objets tridimensionnels fabriques par frittage d'une telle compositionInfo
- Publication number
- EP3541550A1 EP3541550A1 EP17808972.8A EP17808972A EP3541550A1 EP 3541550 A1 EP3541550 A1 EP 3541550A1 EP 17808972 A EP17808972 A EP 17808972A EP 3541550 A1 EP3541550 A1 EP 3541550A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- powder
- magnetic
- composition
- sintering
- composition according
- 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.)
- Pending
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Definitions
- the present invention relates to a magnetic powder composition, and its use in powder agglomeration, layer-by-layer, melting or sintering processes for making three-dimensional magnetic objects.
- the agglomeration of melting powders is caused by radiation such as for example a laser beam (sintering laser), infrared radiation, UV radiation or any source of electromagnetic radiation. to melt the powder layer by layer to make objects.
- radiation such as for example a laser beam (sintering laser), infrared radiation, UV radiation or any source of electromagnetic radiation.
- This technology is generally used to produce prototypes, part models ("rapid prototyping") or to produce finished parts in small series (“rapid manufacturing”), for example in the fields: automotive, nautical, aeronautical, aerospace, medical (prostheses, auditory systems, cellular tissues ...), textiles, clothing, fashion, decoration, housings for electronics, telephony, home automation, computers, lighting.
- the present invention is more particularly concerned with the automotive, electrical, appliance, computer, electronics, microelectronics and other advanced technologies market.
- rare earth permanent magnets are considered strategic materials.
- the rare earths form a group of metals with neighboring properties including scandium, yttrium and 15 lanthanides such as neodymium and samarium.
- Neodymium for example, is used to make powerful magnets of electric motors of any size: those setting in motion the heads of reading and writing of hard drives, those of hybrid cars or generators of wind turbines.
- High performance permanent magnets include neodymium-based magnets, which are known as NdFeB magnets, NIB magnets, and Neo magnets. They are composed of an alloy of neodymium (Nd), iron (Fe) and boron (for example Nd2Fel4B).
- thermoplastic By compound with a thermoplastic or possibly a thermoset then injection or compression to obtain the finished part.
- the magnetic properties are lowered, but the mechanical properties obtained (resistance to impact, bending, etc.) allow new applications.
- thermoplastic polymers (hereinafter TP) are therefore generally chosen for their mechanical properties, in particular for impact resistance, flexibility, and for their physico-chemical resistance. These thermoplastic polymers are easy to implement by conventional injection, extrusion, molding and / or assembly processes. There is therefore a real demand for magnetic materials combining the mechanical properties of the TP and the magnetic properties of the magnets, while having a complex geometry, and requiring the least possible development time. Layer sintering processes layer offer a way to meet this demand but they require a specific prior transformation of these TP and these magnets in the form of powders.
- the present invention therefore aims to provide magnetic powders adapted to be implemented in sintering devices and allow the manufacture of parts, even of complex geometry, with satisfactory properties, especially in terms of density, mechanical and magnetic properties .
- the present invention also aims to provide a method of manufacturing magnetic objects, dense, good resolution, and mechanical properties, directly by sintering.
- the present invention therefore relates to a sinterable magnetic powder composition
- a sinterable magnetic powder composition comprising:
- thermoplastic polymer from 5 to 50% by weight of at least one thermoplastic polymer, relative to the total weight of the composition
- said powder composition having a D50 of less than 100 ⁇ .
- the composition according to the invention comprises from 0.1 to 5% by weight of a pulverulent flow agent with a D50 content of less than 20 ⁇ , relative to the total weight of the composition.
- the present invention also relates to a method of manufacturing a powder composition according to the invention, comprising the following steps:
- additives such as a flow agent
- the yield greater than 50% of step b) is a yield by weight relative to the total weight of initial powder before grinding, and it means that for 100 kg of powder subjected to grinding, more than 50 kg of powder obtained after grinding has a D50 less than 100 ⁇ .
- the present invention also relates to the use of a powder composition according to the invention, less than 100 ⁇ D50, for sintering a magnetic object.
- the object manufactured by sintering has the following properties:
- the D50 is the value of the particle size that divides the analyzed particle population into exactly two. In other words, in the composition according to the invention, 50% of the particles have a size of less than 100 ⁇ .
- the D50 less than 100 ⁇ of the composition according to the invention is essential to obtain a precise definition object with a smooth and regular surface appearance.
- the D50 is measured according to ISO 9276 - Parts 1 to 6: "Representation of data obtained by particle size analysis". In the present description, a laser granulometer (Sympatec Helos) and software (Fraunhofer) are used to obtain the particle size distribution of the powder and to deduce the D50.
- polyamides (homopolyamides and copolyamides), polyolefins, epoxies and polyesters, epoxy / polyether hybrids, polyurethanes, block copolymers, and Polyarylene ether ketones
- polyamide homopolyamide or abbreviated copolyamide CoPA
- polyamide homopolyamide or abbreviated copolyamide CoPA
- monomer case of homopolyamides
- monomers case of CoPA
- lactam type monomers having from 3 to 18 carbon atoms on the main ring and being substitutable
- diamine diacid type monomers resulting from the reaction between an aliphatic diamine having 4 to 18 carbon atoms and a dicarboxylic acid having 4 to 18 carbon atoms;
- copolyamides formed by mixing between an amino acid monomer and a lactam monomer.
- the term "monomer” in the present description of copolyamides should be understood as “repetitive unit”. Indeed, the case where a repeating unit of the PA consists of the combination of a diacid with a diamine is particular. It is considered that it is the combination of a diamine and a diacid, that is to say the diamine.diacide couple (in equimolar quantity), which corresponds to the monomer. This is explained by the fact that, individually, the diacid or the diamine is only a structural unit, which is not enough on its own to polymerize.
- alpha, omega-amino acids include those having from 4 to 18 carbon atoms, such as aminocaproic acid, amino-7-heptanoic acid, amino-11-undecanoic acid, n-heptyl-11- aminoundecanoic and amino-12-dodecanoic.
- lactams include those having from 3 to 18 carbon atoms on the main ring and may be substituted. There may be mentioned, for example, b, b-dimethylpropriolactam, ⁇ , ⁇ -dimethylpropriolactam, amylolactam, caprolactam also called lactam 6, capryllactam also known as lactam 8, oenantholactam, 2-pyrrolidone and lauryllactam also called lactam 12.
- dicarboxylic acid there may be mentioned acids having between 4 and 18 carbon atoms of carbon. Mention may be made, for example, of adipic acid, sebacic acid, azelaic acid, suberic acid, isophthalic acid, butanedioic acid, 1,4-cyclohexyldicarboxylic acid, terephthalic acid, sodium or lithium salt of sulphoisophthalic acid, dimerized fatty acids (these dimerized fatty acids have a dimer content of at least 98% and are preferably hydrogenated) and dodecanedioic acid HOOC- (CH2) 10- COOH.
- adipic acid sebacic acid, azelaic acid, suberic acid
- isophthalic acid butanedioic acid
- 1,4-cyclohexyldicarboxylic acid 1,4-cyclohexyldicarboxylic acid
- terephthalic acid sodium or lithium salt of sulphoisophthalic acid
- a diamine By way of example of a diamine, mention may be made of aliphatic diamines having from 4 to 18 atoms, which may be aryl and / or saturated cyclic. By way of examples, mention may be made of hexamethylenediamine, piperazine, tetramethylenediamine, octamethylene diamine, decamethylene diamine, dodecamethylenediamine, 1,5-diaminohexane and 2,2,4-trimethyl-1,6.
- MPDM methyl pentamethylenediamine
- AMF bis (aminocyclohexyl) methane
- BMACM bis (3-methyl-4-aminocyclohexyl) methane
- methaxylyenediamine bis-p-aminocyclohexylmethane and trimethylhexamethylenediamine.
- monomers of the type "diamine. diacid” include those resulting from the condensation of hexamethylenediamine with a C6 to C36 diacid, especially the monomers: 6.6, 6.10, 6.11, 6.12, 6.14, 6.18. Mention may be made of the monomers resulting from the condensation of decanediamine with a C6 to C36 diacid, especially the monomers: 10.10, 10.12, 10.14, 10.18; or resulting from the condensation of decanediamine with a terephthalic acid, i.e., the monomer 10.T.
- copolyamides formed from the various types of monomers described above include copolyamides resulting from the condensation of at least two alpha omega aminocarboxylic acids or two lactams or a lactam and an alpha, omega-aminocarboxylic acid. Mention may also be made of the copolyamides resulting from the condensation of at least one alpha omega aminocarboxylic acid (or a lactam), at least one diamine and at least one dicarboxylic acid.
- copolyamides resulting from the condensation of an aliphatic diamine with an aliphatic dicarboxylic acid and of at least one other monomer chosen from the aliphatic diamines different from the preceding one and the aliphatic diacids different from the preceding one.
- copolyamides examples include copolymers of caprolactam and lauryllactam (PA 6/12), copolymers of caprolactam, hexamethylenediamine and adipic acid (PA 6 / 6.6), copolymers of caprolactam , lauryllactam, hexamethylene diamine and adipic acid (PA 6/12 / 6.6), copolymers of caprolactam, hexamethylenediamine and azelaic acid, amino 11 undecanoic acid, and lauryllactam, (PA 6 / 6.9 / 11/12), copolymers of caprolactam, adipic acid and hexamethylenediamine, amino-11-undecanoic acid, lauryllactam (PA 6 / 6.6 / 11/12), copolymers of hexamethylene diamine, azelaic acid, and lauryllactam (PA 6.9 / 12), copolymers of 2-
- Particularly preferred substances are polyamide 11 and polyamide 12, as well as polyamides and copolyamides, in particular using monomers 6.10, 6.12, 6.14, 6.18, 10.10 and 10.12.
- the preferred particle diameters are substantially close to ⁇ (median diameter d50).
- Polyolefins are understood to mean polymers comprising olefin units such as, for example, ethylene, propylene, butene-1 units, etc.
- olefin units such as, for example, ethylene, propylene, butene-1 units, etc.
- These copolymers of ethylene can be grafted with anhydrides of unsaturated dicarboxylic acids or epoxides.
- Formula IB It is not possible to exclude, in a more general context, polyarylene ether ketones corresponding to the generic names PEK, PEEKEK, PEEK, PEKEKK (where E denotes an ether function and K a ketone function), especially when their use is combined with that of PEKK in mass proportions where PEKK represents more than 50% mass proportion and preferably more than 80% in mass proportion, inclusive.
- the polyarylene ether ketones are polyetherketone ketones comprising a mixture of the units IA and IB such that the mass percentage in terephthalic unit with respect to the sum of the terephthalic and isophthalic units is between 55% and 85% and preferably between 55% and 70%, ideally 60%.
- terephthalic and isophthalic unit is meant the formula of terephthalic and isophthalic acids respectively.
- polyarylene ether ketones are in the form of powders which may have been prepared by grinding or precipitation.
- thermoplastic elastomeric polymers TPE
- a block is said to be “flexible” if it has a low glass transition temperature (Tg).
- Tg glass transition temperature
- low glass transition temperature is meant a glass transition temperature Tg less than 15 ° C., preferably less than 0 ° C., advantageously less than -15 ° C., still more advantageously -30 ° C., optionally less than -30 ° C. 50 ° C.
- Flexible or soft blocks that can be envisaged in the copolymer according to the invention are especially those selected from polyether blocks, polyester blocks, polysiloxane blocks, such as polydimethylsiloxane or PDMS blocks, polyolefin blocks, polycarbonate blocks, and their mixtures.
- the flexible blocks that can be envisaged are described, for example, in French Patent Application No. 0950637, page 32 line 3 to page 38 line 23.
- the polyether blocks are chosen from polyethylene glycol (PEG), poly (1,2-propylene glycol) (PPG), the poly (1,3-propylene glycol) (PO 3 G), poly (tetramethylene glycol) (PTMG), and copolymers or mixtures thereof.
- the number-average molar mass Mn of the soft blocks according to the invention is in the range from 250 to 5000 g / mol, preferably from 250 to 3000 g / mol, and more preferably from 500 to 2000 g / mol. mol.
- the rigid blocks may be based on polyamide, polyurethane, polyester or a mixture of these polymers. These blocks are described in particular in the French patent application No. 0856752.
- the rigid blocks are preferably based on polyamide.
- the polyamide blocks may comprise homopolyamides or copolyamides.
- the polyamide blocks that can be envisaged in the composition of the invention are in particular those defined in application FR0950637 of page 27 line 18 to page 31 line 14.
- the number-average molar mass Mn of the polyamide blocks is in the range of from 400 to 20000 g / mol, preferably from 500 to 10000 g / mol, and more preferably from 600 to 3000 g / mol.
- polyamide blocks As examples of polyamide blocks, mention may be made of those comprising at least one of the following molecules: PA12, PAI, PA10.10, PA6.10, PA6, PA6 / 12, a copolyamide comprising at least one of the following monomers: , 5.4, 5.9, 5.10, 5.12, 5.13, 5.14, 5.16, 5.18, 5.36, 6.4, 6.9, 6.10, 6.12, 6.13, 6.14, 6.16, 6.18, 6.36, 10.4, 10.9, 10.10, 10.12, 10.13, 10.14, 10.16 , 10.18, 10.36, 10.T, 12.4, 12.9, 12.10, 12.12, 12.13, 12.14, 12.16, 12.18, 12.36, 12.T and mixtures or copolymers thereof.
- said at least one block copolymer comprises at least one block chosen from: polyether blocks, polyester blocks, polyamide blocks, polyurethane blocks, and mixtures thereof.
- polyether blocks also known as COPE or copolyetheresters
- polyurethane block and polyether block copolymers also called TPU abbreviation for polyurethanes thermoplastics
- copolymers with polyamide blocks and polyether blocks also called PEBA according to IUPAC, or polyether-block-amide.
- said at least one copolymer comprises a copolymer with polyamide blocks and polyether blocks (PEBA).
- said PEBA comprises PA12-PEG, PA6-PEG, PA6 / 12-PEG, PA11-PEG, PA12-PTMG, PA6-PTMG, PA6 / 12-PTMG, PA11-PTMG, P Al2-PEG / PPG, PA6-PEG / PPG, PA6 / 12-PEG / PPG, PA11-PEG / PPG, PA11 / PO3G, PA6.10 / PO3G and / or PA10.10 / PO3G.
- the melting point (Tf) of the polymer powder corresponds to the melting temperature at first heating (Tfl) of the powder. . It is measured according to ISO 11357-3 Plastics - Differential scanning calorimetry (DSC) Part 3.
- the block copolymer has a melting temperature Tf (of first heating: Tfl) lower than 180 ° C.
- Tf melting temperature
- the use of such copolymers of Tf ⁇ 180 ° C in the composition of the invention makes it possible to obtain, in particular by sintering, three-dimensional objects of improved flexibility (modulus less than 1000 MPa) with respect to the parts obtained by sintering powders. polyamide 12 or 11 for example.
- the weight ratio of the rigid blocks on the soft blocks of the copolymer according to the invention is less than 0.7. This makes it possible to obtain three-dimensional objects of even better flexibility, for example a modulus of elasticity of less than 100 MPa and an elongation at break greater than 100%, measured according to the ISO 527-2: 93-1BA standard.
- magnetic particle within the meaning of the invention is understood to mean magnetic particles based on rare earths and / or based on alnico (aluminum, nickel, cobalt) and / or ferrite-based, and D50 in the range of 0.1 to 100 ⁇ .
- ferrite particles As ferrite particles, it is possible to use ferrite particles of magnetoplombite type.
- the ferrite particles have an average particle diameter of preferably 1.0 to 5.0 ⁇ , more preferably 1.0 to 2.0 ⁇ ; A BET surface area value preferably from 1 to 10 m 2 / g, more preferably 1 to 5 m 2 / g; Coercive force IHc preferably from 119 to 557 kA / m (1500 to 7000 Oe), more preferably 119 to 398 kA / m (1500 to 5000 Oe); And a residual magnetization value preferably from 100 to 300 mT (1,000 to 3,000 G), more preferably from 100 to 200 mT (1,000 to 2,000 G).
- Magnetic rare earth particles are particles of metal compounds composed of at least one rare earth element and at least one transition metal.
- Examples of rare earth magnetic particles may include magnetic particles such as rare earth cobalt-based particles, rare earth-iron-boron particles, and rare earth-iron-nitrogen particles.
- rare earth magnetic particles rare earth-iron-boron particles and iron-rare iron nitrogen-based particles are particularly preferred because of the production of bonded magnets having excellent properties.
- the rare earth magnetic particles have a D50 preferably from 1 to 100 ⁇ , more preferably from 1 to 80 ⁇ .
- a BET surface area value preferably from 0.5 to 5 m 2 / g, more preferably from 0.5 to 3 m 2 / g;
- a coercive force IHc preferably from 239 to 1591 kA / m (3.0 to 20 kOe), more preferably 318 to 1114 kA / m (4.0 to 15 kOe);
- a residual magnetization value preferably 0.3 to 1.8 mT (3.0 to 18 kG), more preferably 0.5 to 1.3 mT (5.0 to 13 kG).
- Magnetic particles based on Nb-Fe-B can be mixed directly with the polymer resin.
- the particles are preferably previously pulverized into particles having an average particle diameter of less than or equal to 100 ⁇ . before mixing using, for example, a jet mill, an atomizer, a ball mill, etc., in order to obtain greater fluidity and improved magnetic properties for the resulting powder composition according to the invention.
- the magnetic particles used in the powder according to the invention may optionally have been subjected to various front surface treatments in order to avoid deterioration of their magnetic properties due to oxidation, but this is not obligatory, because the use of polymer, especially polyamide, in the composition according to the invention already makes it possible to limit this problem of oxidation of the metal particles.
- silane coupling agents titanium coupling agents, aluminum coupling agents, polymers, and the like may be used.
- siloxane organic, inorganic phosphoric agents Acid-based surface treatment agents or the like.
- silane coupling agents are preferred.
- composition powder according to the invention can be produced by various methods, such as:
- One or more additives may be added to this milled powder, chosen from: flow agents, stabilizers, coupling agents, etc.
- the composition of the invention further comprises a flow agent in a sufficient quantity (which represents from 0.1 to 5% by weight of the composition) so that the composition flows and forms a flat layer, especially when of a layer-by-layer sintering process.
- the flow agent is chosen from those commonly used in the field of sintering polymer powders.
- this flow agent is substantially spherical in shape.
- silicas precipitated silicas, hydrated silicas, vitreous silicas, fumed silicas, fumed silicas, vitreous phosphates, vitreous borates, vitreous oxides, amorphous alumina, titanium dioxide, talc, mica, kaolin, attapulgite, calcium silicates, alumina and magnesium silicates.
- compositions according to the invention can of course also comprise any type of additive suitable for the polymer powders used in sintering: in particular additives which contribute to improving the properties of the powder for its use in agglomeration technology and / or additives for improving the mechanical properties (tensile strength and elongation at break) or aesthetic properties (color) of objects obtained by melting.
- the composition of the invention may especially comprise dyes, pigments for coloring, TiO 2, pigments for infra-red absorption, carbon black, fire-resistant additives, glass fibers, carbon fibers. etc.
- the compositions of the invention may further contain at least one additive selected from anti-oxygen stabilizers, light stabilizers, anti-shock agents, antistatic agents, flame retardants, and mixtures thereof.
- additives are in the form of a D50 powder of less than 20 ⁇ .
- the introduction of these additives during the process for manufacturing the powder composition according to the invention makes it possible to improve their dispersion and their effectiveness.
- a sintering method implementing a composition according to the invention makes it possible to obtain colored magnetic parts directly without subsequent operation, coating or painting.
- the subject of the present invention is also the use of a thermoplastic powder composition as defined above, in a sintering process for producing a magnetic object ...
- the present invention also relates to a method for manufacturing a three-dimensional magnetic object, comprising sintering layer by layer of a composition powder according to the invention.
- the subject of the present invention is in particular a method for manufacturing three-dimensional parts from powder according to the invention by a layer-by-layer method, in which regions of the respective powder layer are selectively melted via the introduction of electromagnetic energy. , where the selectivity is obtained by the application of susceptors, inhibitors, uu via masks.
- said method uses laser sintering.
- the present invention relates to a three-dimensional magnetic object that can be manufactured according to the method described above, said object having the following properties:
- Intrinsic Coercivity Hci 1 to 15 kOe
- said three-dimensional object is a component of sports equipment, shoes, sports shoes, shoe sole, decoration, luggage, glasses, furniture, audio-visual equipment, computers, equipment automotive or aeronautical and / or a component of medical, electrical, appliance, computer, electronic and / or microelectronics equipment.
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- Compositions Of Macromolecular Compounds (AREA)
- Powder Metallurgy (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1661250A FR3058918B1 (fr) | 2016-11-18 | 2016-11-18 | Composition de poudre frittable magnetique et objets tridimensionnels fabriques par frittage d'une telle composition |
| PCT/FR2017/053176 WO2018091855A1 (fr) | 2016-11-18 | 2017-11-20 | Composition de poudre frittable magnetique et objets tridimensionnels fabriques par frittage d'une telle composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3541550A1 true EP3541550A1 (fr) | 2019-09-25 |
Family
ID=58401678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP17808972.8A Pending EP3541550A1 (fr) | 2016-11-18 | 2017-11-20 | Composition de poudre frittable magnetique et objets tridimensionnels fabriques par frittage d'une telle composition |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20190318855A1 (fr) |
| EP (1) | EP3541550A1 (fr) |
| JP (1) | JP7211944B2 (fr) |
| CN (1) | CN109963670A (fr) |
| FR (1) | FR3058918B1 (fr) |
| WO (1) | WO2018091855A1 (fr) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3087198B1 (fr) | 2018-10-11 | 2021-11-19 | Arkema France | Poudre de polymere thermoplastique pour impression 3d a recyclabilite amelioree |
| FR3096053B1 (fr) | 2019-05-16 | 2021-11-19 | Arkema France | Poudre de copolymère à blocs polyamides et à blocs polyéthers |
| US20210050149A1 (en) * | 2019-08-12 | 2021-02-18 | Eos Of North America, Inc. | Method of manufacturing a permanent magnet |
| EP4058225A1 (fr) | 2019-11-11 | 2022-09-21 | Carpenter Technology Corporation | Matériaux composites magnétiques doux et procédés et poudres pour produire ceux-ci |
| CN111138833A (zh) * | 2019-12-20 | 2020-05-12 | 东莞深圳清华大学研究院创新中心 | 3d打印磁性热塑性聚氨酯弹性体材料及其制备方法与应用 |
| WO2021252395A1 (fr) * | 2020-06-08 | 2021-12-16 | Eos Of North America, Inc. | Masque respiratoire profilé souple utilisant la fabrication additive |
| FR3115039B1 (fr) * | 2020-10-13 | 2023-11-10 | Arkema France | Composition magnétique comprenant une résine de copolymères à blocs polyamides et à blocs polyéthers |
| CN114437500B (zh) * | 2021-12-22 | 2023-06-30 | 重庆交通大学绿色航空技术研究院 | 一种可用于激光选择性烧结的聚醚醚酮复合粉末及其制备方法 |
| CN119092242B (zh) * | 2024-09-10 | 2025-10-17 | 安徽瑞德磁电科技有限公司 | 一种用于金属软磁粉芯的添加剂及制备方法 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040113118A1 (en) * | 2002-10-17 | 2004-06-17 | Sumio Kamoi | Image forming apparatus and developing device therefor |
| FR2955330A1 (fr) * | 2010-01-19 | 2011-07-22 | Arkema France | Composition de poudre thermoplastique et objets tridimensionnels fabriques par frittage d'une telle composition |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR856752A (fr) | 1939-03-09 | 1940-08-07 | Massiot & Cie G | Grille antidiffusante de radiographie à mouvement vibratoire |
| FR950637A (fr) | 1947-07-28 | 1949-10-03 | Tricot indémaillable | |
| US5225459A (en) * | 1992-01-31 | 1993-07-06 | Hoeganaes Corporation | Method of making an iron/polymer powder composition |
| JPH06236807A (ja) * | 1992-10-29 | 1994-08-23 | Seiko Epson Corp | 樹脂結合型磁石及びその製造方法 |
| JPH07320968A (ja) * | 1994-05-19 | 1995-12-08 | Matsushita Electric Ind Co Ltd | 希土類−鉄−窒素系ボンド磁石の製造方法 |
| US5498276A (en) * | 1994-09-14 | 1996-03-12 | Hoeganaes Corporation | Iron-based powder compositions containing green strengh enhancing lubricants |
| JPH08264360A (ja) * | 1995-03-28 | 1996-10-11 | Seiko Epson Corp | 樹脂結合型磁石の製造方法および樹脂結合型磁石 |
| DE102007016656B4 (de) * | 2007-04-05 | 2018-10-11 | Eos Gmbh Electro Optical Systems | PAEK-Pulver, insbesondere zur Verwendung in einem Verfahren zum schichtweisen Herstellen eines dreidimensionalen Objektes, sowie Verfahren zu dessen Herstellung |
| FR2930555B1 (fr) | 2008-04-29 | 2012-08-24 | Arkema France | Procede pour augmenter l'ecart entre la temperature de fusion et la temperature de cristallisation d'une poudre de polyamide |
| CN101752074A (zh) | 2008-12-19 | 2010-06-23 | 武汉福翰科技有限公司 | 一种纳米铁基软磁块体的制备方法 |
| JP5103553B1 (ja) * | 2011-06-24 | 2012-12-19 | 日東電工株式会社 | 希土類永久磁石及び希土類永久磁石の製造方法 |
| DE102012210081A1 (de) * | 2012-06-15 | 2013-12-19 | Siemens Ag | Verfahren zur Herstellung eines Permanentmagneten |
| US9512544B2 (en) * | 2013-07-11 | 2016-12-06 | Tundra Composites, LLC | Surface modified particulate and sintered or injection molded products |
| JP2015229781A (ja) | 2014-06-03 | 2015-12-21 | 国立大学法人横浜国立大学 | 磁性体コアの製造方法、磁性体コア製造装置、及びその製造装置の動作方法 |
-
2016
- 2016-11-18 FR FR1661250A patent/FR3058918B1/fr active Active
-
2017
- 2017-11-20 US US16/461,969 patent/US20190318855A1/en not_active Abandoned
- 2017-11-20 WO PCT/FR2017/053176 patent/WO2018091855A1/fr not_active Ceased
- 2017-11-20 EP EP17808972.8A patent/EP3541550A1/fr active Pending
- 2017-11-20 JP JP2019526004A patent/JP7211944B2/ja active Active
- 2017-11-20 CN CN201780071228.1A patent/CN109963670A/zh active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040113118A1 (en) * | 2002-10-17 | 2004-06-17 | Sumio Kamoi | Image forming apparatus and developing device therefor |
| FR2955330A1 (fr) * | 2010-01-19 | 2011-07-22 | Arkema France | Composition de poudre thermoplastique et objets tridimensionnels fabriques par frittage d'une telle composition |
Non-Patent Citations (1)
| Title |
|---|
| See also references of WO2018091855A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3058918B1 (fr) | 2021-01-01 |
| WO2018091855A1 (fr) | 2018-05-24 |
| JP7211944B2 (ja) | 2023-01-24 |
| JP2019536909A (ja) | 2019-12-19 |
| FR3058918A1 (fr) | 2018-05-25 |
| US20190318855A1 (en) | 2019-10-17 |
| CN109963670A (zh) | 2019-07-02 |
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