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公开(公告)号：JPH0855712A
公开(公告)日：1996-02-27
申请号：JP12172395
申请日：1995-05-19
Applicant: ASAHI CHEMICAL IND
Inventor： IMAOKA NOBUYOSHI , ITO SAKAE , OKAMOTO ATSUSHI , IRIYAMA YASUHIKO
Abstract: PURPOSE:To provide a rare earth-transition metal-nitrogen magnetic material which is made of coarse particles, can exert a large coercive force, and has an excellent oxidation resistance and temperature characteristic. CONSTITUTION:A magnetic material is expressed by a general expression, RalphaFe(100-alpha-beta-gamma)MnbetaNgamma(where, R is at least one kind of rare-earth element and alpha, beta, and gamma represent atomic % and satisfy relations, 3 =10mum.
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公开(公告)号：JPH06163227A
公开(公告)日：1994-06-10
申请号：JP30852092
申请日：1992-11-18
Applicant: ASAHI CHEMICAL IND
Inventor： SUZUKI YOSHIO , IMAOKA NOBUYOSHI
Abstract: PURPOSE:To enhance the magnetic characteristics and oxidation resistance by a method wherein R-Fe-M-N base material having rhombohedral system or hexagonal system crystal structure is made to coexist with a metallic element. CONSTITUTION:A magnetic material is expressed by Ralpha(Fe(1-gamma)Mr) (100-alpha-beta)NB, where R represents at least one kind of rare earth elements including Y, M represents at least one kind of elements out of Re, Ru, Os, Rh, Ir, Pd, Pt, Au, alpha, beta satisfy the inequalities of 3
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公开(公告)号：JPH0661023A
公开(公告)日：1994-03-04
申请号：JP21386992
申请日：1992-08-11
Applicant: ASAHI CHEMICAL IND
Inventor： MITSUI RYOICHI , IMAOKA NOBUYOSHI
Abstract: PURPOSE:To obtain a rare earth bonded magnet, which has improved magnetic characteristics, from magnetic powder of a single basic composition obtainable by mixing a plurality of magnetic powder, which are different from each other in basic composition. CONSTITUTION:A rare earth bonded magnet is manufactured using a mixture of magnetic powder of a basic composition consisting of an Sm or Fe nitride, magnetic powder of a basic composition consisting of Sm or Co and/or magnetic powder of a basic composition consisting of Nd, Fe or B.
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公开(公告)号：JPH05315116A
公开(公告)日：1993-11-26
申请号：JP11270992
申请日：1992-05-01
Applicant: ASAHI CHEMICAL IND
Inventor： IMAOKA NOBUYOSHI , KATSUMATA TSUTOMU
Abstract: PURPOSE:To get a bond magnet having high magnetic property and oxidation resistance and being excellent in surface smoothness and dimension stability by combining thermoplastic resin with thermosetting resin as resin ingredients. CONSTITUTION:A magnetic material resin composite material is composed of 79.9-99.9wt.% rare earth-iron-nitrogen based magnetic powder, 0.1-20wt.% thermosetting resin, and 0.1-20wt.% thermoplastic resin. Using this magnetic material resin composite material, a a bond magnet is manufactured by compression-molding, extrusion-molding, or injection molding, or the like. Hereby, a magnetic material resin composite material can be gotten, which contains rare earth-iron-nitrogen material small in grain diameter and having high magnetic property and besides has high magnetic field orientation property, corrosion resistance, and oxidation resistance. Furthermore, using these material, a high magnetic property of bond magnet excellent in surface smoothness and dimension stability can be manufactured.
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公开(公告)号：JPH05308007A
公开(公告)日：1993-11-19
申请号：JP11140992
申请日：1992-04-30
Applicant: ASAHI CHEMICAL IND
Inventor： IMAOKA NOBUYOSHI , KATSUMATA TSUTOMU
Abstract: PURPOSE:To provide a magnetic material resin composite material which has high density, and which is excellent in the magnetic field orientation and the oxide resistance by using a rare-earth-iron-nitrogen system magnetic material which is a particle having a high magnetic characteristic. CONSTITUTION:This thermosetting magnetic material composite material is composed of a rare-earth-iron-nitrogen system magnetic pulverized body of 79 to 99.5wt.%, a lubricant of 0.001 to 5wt.%, a coupling agent of 0.001 to 5wt.%, and epoxy resin of 0.2 to 20wt.%.
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Patent Agency Ranking
公开(公告)号：JPH05304009A
公开(公告)日：1993-11-16
申请号：JP11048892
申请日：1992-04-28
Applicant: ASAHI CHEMICAL IND
Inventor： TSUBATA TOSHIO , IMAOKA NOBUYOSHI
Abstract: PURPOSE:To obtain the title magnetic resin composite material having a high magnetic field orientational property and a high oxidation-resistant property by a method wherein the magnetic resin composite material is composed of the specific wt.% of rare earth-iron base nitride magnetic powder, a lubricant, a coupling agent and thermosetting resin. CONSTITUTION:The title magnetic resin composite material is composed of rare earth-iron base nitrogen magnetic powder, in the range of composition showing, ferromagnetism, of 84 to 99.5 wt.%, a lubricant, containing one or two or more kinds selected from fatty acids, amines, fatty acid salts, and fatty acid amides of 0.10 to 5wt.%, a coupling agent, containing at least a kind selected from titanaium and silicon, of 0 to 5wt.% and thermosetting resin, containing one or two or more kinds selected from epoxy resin, epoxy denatured phenol non-saturated polyester resin, of 0.2 to 15wt.%. As a result, excellent magnetic resin composite material, having both magnetic field orientational property and an oxidation-resistant property, can be obtained.
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公开(公告)号：JPH04157705A
公开(公告)日：1992-05-29
申请号：JP28191390
申请日：1990-10-22
Applicant: ASAHI CHEMICAL IND
Inventor： IMAOKA NOBUYOSHI , IRIYAMA YASUHIKO , KOBAYASHI KURIMASA
Abstract: PURPOSE:To obtain a magnetic-material resin composite material whose magnetic characteristic is high, whose surface smoothness, mechanical strength and dimensional stability are excellent and whose molding property and magnetic-field orientation property are excellent by a method wherein the following are contained in specific amounts: a rare earth-iron-nitrogen-based magnetic pulverulent body; a specific coupling agent; a thermoplastic resin; and a lubricant. CONSTITUTION:This magnetic-material resin composite material is constituted of the following: 70 to 95wt.% of a rare earthiron-nitrogen-based pulverulnent body; 0.01 to 5wt.% of a coupling agent which has one kind or two or more kinds of organic chains out of an amino group, an alkyl group, a >=3 C alkoxy group, a >=10 C phenoxy group, a methacrylic group, a sulfonyl group, a mercapto group, an ester bond, a phosphoric ester bond, a pyrophosphoric ester bond, a phosphorus ester bond, a urea bond and an amide bond and which contains at least one kind out of titanium and silicon; 3 to 30wt.% of a thermoplastic resin; and 0 to 5wt.% of a lubricant. The magnetic-material resin composite material is excellent in its molding property and its magnetic characteristic, and it is possible to obtain a bonded magnet whose dimensional stability and surface smoothness are extremely good.
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公开(公告)号：JPH0479202A
公开(公告)日：1992-03-12
申请号：JP19288490
申请日：1990-07-23
Applicant: ASAHI CHEMICAL IND
Inventor： KOBAYASHI KURIMASA , KASHIWATANI NAOKO , IMAOKA NOBUYOSHI
Abstract: PURPOSE:To improve magnetic properties and enable the application of the powder to a bond magnet by making the grain size of the particles within the range of the single magnetic domain particle diameter, with respect to the magnetic material which has the composition in the line of rare earth-iron- nitrogen-hydrogen-oxygen. CONSTITUTION:Rare earth-iron alloy is composed, and after coarse crushing, nitrification and hydrogenation process is performed under low oxygen partial pressure, and the magnetic powder at this stage is further pulverized into the powder which has the particle diameter equivalent to the single magnetic domain particle diameter of magnetic material. The magnetic material shown by the general formula RealphaFe(1-alpha-beta-gamma-delta)NbetaHgammaOdelta (Re is the rare earth element including yttrium, 5
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公开(公告)号：JPH03141609A
公开(公告)日：1991-06-17
申请号：JP27835989
申请日：1989-10-27
Applicant: ASAHI CHEMICAL IND
Inventor： IRIYAMA YASUHIKO , SUDO AKINOBU , IMAOKA NOBUYOSHI
Abstract: PURPOSE:To obtain a high-performance magnet by classifying coarse grains into two kinds or more of particle sizes before fine grinding in a process of manufacturing a rare earth-iron-nitrogen permanent magnet. CONSTITUTION:First, a high-frequency furnace or the like is used to compose a Re-Fe base alloy with a 5-25 atom% of Re and a 75-95 atom% of Fe, which is coarsely ground by jaw crusher or other means so that the particle diameter is 10-500mum. Next, the coarsely ground material base alloy is impregnated with nitrogen and hydrogen, and this material undergoes classification that features this process. Classification is conducted by combination of several kinds of screens different in mesh: for example, classification of a coarse grain having a particle diameter of 20-100mum into two kinds of particle sizes: 20-60mum and 60-100mum can exhibit its effectiveness. In addition, classification into more grain sizes suffices for enhancement of its effectiveness, and fine grinding after classification requires a particle diameter of 1-10mum by use of a ball mill and others. Thereafter, this material, epoxy resin, and the like are kneaded, oriented in a magnetic field and then hardened into a bond magnet.
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公开(公告)号：JPH03101102A
公开(公告)日：1991-04-25
申请号：JP23582289
申请日：1989-09-13
Applicant: ASAHI CHEMICAL IND
Inventor： KOBAYASHI KURIMASA , IRIYAMA YASUHIKO , IMAOKA NOBUYOSHI , SUDO AKINOBU
Abstract: PURPOSE:To improve the corrosion-resistant property, to hold a good magnetic characteristic and to obtain an application method of a material as a fine pulverulent body by a method wherein oxygen is added in the material. CONSTITUTION:A component of a material is composed of e rare earth Re, iron Fe, nitrogen N, hydrogen H and oxygen O end is expressed by the following formula. Formula: RealphaFe(1-alpha-beta-gamma-delta)-HbetaHgammaOdelta. In the formula, Re represents rare-earth elements including yttrium Y, 5
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