Country
Full text data for US and EP
Status
Type
Filing Date
Publication Date
Inventor
Assignee
Click to expand
IPC
No.
Publication Number
Title
Publication/Patent Number Publication/Patent Number
Publication date Publication date
Application number Application number
Filing date Filing date
Inventor Inventor
Assignee Assignee
IPC IPC
1
WO2013186864A1
Publication/Patent Number: WO2013186864A1
Publication date: 2013-12-19
Application number: 2012065070
Filing date: 2012-06-13
Abstract: The purpose of the present invention is to improve the magnetic characteristics of a sintered magnet without adding a supplementary heavy rare earth element. A sintered magnet composed of an NdFeB main phase and a grain boundary phase
2
WO2013179337A1
Publication/Patent Number: WO2013179337A1
Publication date: 2013-12-05
Application number: 2012003518
Filing date: 2012-05-30
Abstract: The purpose of the present invention is to improve the magnetic characteristics of a sintered magnet without any additional heavy rare earth element. A sintered magnet composed of an NdFeB main phase and a grain boundary phase
3
US20120145944A1
Publication/Patent Number: US20120145944A1
Publication date: 2012-06-14
Application number: 13/390,738
Filing date: 2010-08-11
Abstract: Disclosed is a magnetic material in which 50% by volume of the magnetic particles are accounted for by the main phase of the magnet, the main phase having a Curie temperature (Curie point) of 200° C. or higher, a saturation magnetic-flux density at around 20° C. of 1.0 T (tesla) or higher, and a coercive force of 10 kOe or higher, the crystal structure of the main phase being stable up to 200° C., and in which phases other than the main phase which are present at the grain boundaries or grain surfaces have stabilized or improved the magnetic properties. This magnetic material comprises two ferromagnetic phases, i.e., a ferromagnetic compound which is composed of fluorine, iron, and one or more rare-earth elements including yttrium and ferromagnetic iron which contains fluorine, carbon, nitrogen, hydrogen, or boron. A fluoride and an oxyfluoride have been formed at some of the boundaries or surfaces of the grains of the ferromagnetic phases. Disclosed is a magnetic material in which 50% by volume of the magnetic particles are accounted for by the main phase of the magnet, the main phase having a Curie temperature (Curie point) of 200° C. or higher, a saturation magnetic-flux density at around 20° C. of 1.0 ...more ...less
4
US20120175986A1
Publication/Patent Number: US20120175986A1
Publication date: 2012-07-12
Application number: 13/346,756
Filing date: 2012-01-10
Abstract: In a ferromagnetic material containing at least one kind of rare-earth element, a layer containing at least one kind of alkaline earth element or rare-earth element and fluorine is formed at the grain boundary or near the powder surface of the ferromagnetic material. A further layer containing at least one kind of rare-earth element, having a fluorine concentration lower than that of the layer described first and having a rare-earth element concentration higher than that of the host phase of the ferromagnetic material, or an oxide layer containing a rare-earth element is formed in adjacent with a portion of the layer described first. In a ferromagnetic material containing at least one kind of rare-earth element, a layer containing at least one kind of alkaline earth element or rare-earth element and fluorine is formed at the grain boundary or near the powder surface of the ferromagnetic material. A further ...more ...less
5
US20120111232A1
Publication/Patent Number: US20120111232A1
Publication date: 2012-05-10
Application number: 13/351,350
Filing date: 2012-01-17
Abstract: A conventional method for forming an insulating film on a magnet has a difficulty in achieving sufficient improvement in magnetic characteristics due to nonuniformity of a coating film, and an extended time and higher temperature which are required in a thermal treatment. In order to solve the problems, the present invention provides a treating solution composed of an alcohol based solvent and a rare earth fluoride or alkaline earth metal fluoride dispersing in the solvent. In the treating solution, at least one X-ray diffraction peak has a half-value width larger than 1°. The present invention also provides a method for forming an insulating film using the treating solution. A conventional method for forming an insulating film on a magnet has a difficulty in achieving sufficient improvement in magnetic characteristics due to nonuniformity of a coating film, and an extended time and higher temperature which are required in a thermal treatment. In ...more ...less
6
US20120025651A1
Publication/Patent Number: US20120025651A1
Publication date: 2012-02-02
Application number: 13/257,331
Filing date: 2010-02-18
Abstract: A sintered magnet according to the present invention is a sintered magnet configured from a magnetic powder grain having Nd2Fe14B as a main component, in which: fluorine, a heavy rare earth element, oxygen, and carbon are segregated in part of grain-boundary regions of said sintered magnetic powder grain; concentration of the carbon is higher than concentration of the fluorine at a grain-boundary triple junction of the grain-boundary region; and concentration of the heavy rare earth element decreases from said grain-boundary triple junction toward an inside of said magnetic powder grain. A sintered magnet according to the present invention is a sintered magnet configured from a magnetic powder grain having Nd2Fe14B as a main component, in which: fluorine, a heavy rare earth element, oxygen, and carbon are segregated in part of grain-boundary regions of said ...more ...less
7
WO2012176655A1
Publication/Patent Number: WO2012176655A1
Publication date: 2012-12-27
Application number: 2012064993
Filing date: 2012-06-12
Abstract: The purpose of the present invention is to obtain a sintered magnet having a high coercivity and a large maximum energy product in spite of using a reduced amount of rare earth element. The sintered magnet of the present invention comprises ferrous alloy particles having a film containing a heavy rare earth element or yttrium fluoride and rare earth-iron-boron alloy particles; between the ferrous alloy particles and the rare earth-iron-boron alloy particles The purpose of the present invention is to obtain a sintered magnet having a high coercivity and a large maximum energy product in spite of using a reduced amount of rare earth element. The sintered magnet of the present invention comprises ferrous alloy particles having a film ...more ...less
8
WO2012029738A1
Publication/Patent Number: WO2012029738A1
Publication date: 2012-03-08
Application number: 2011069520
Filing date: 2011-08-30
Abstract: The purpose of the present invention is to provide a sintered magnet enabling both a reduction in the amount of rare-earth elements used in the magnet material and further improvement of magnetic properties. The sintered magnet of the present invention comprises at least three phases The purpose of the present invention is to provide a sintered magnet enabling both a reduction in the amount of rare-earth elements used in the magnet material and further improvement of magnetic properties. The sintered magnet of the present invention comprises at least three ...more ...less
9
US20110079327A1
Publication/Patent Number: US20110079327A1
Publication date: 2011-04-07
Application number: 12/964,402
Filing date: 2010-12-09
Abstract: The object of the present invention is to provide a rare earth magnet which enables to achieve a good balance between high coercive force and high residual magnetic flux density, and its manufacturing method. The present invention provides a rare earth magnet in which a layered grain boundary phase is formed on a surface or a portion of a grain boundary of Nd2Fe14B which is a main phase of an R—Fe—B (R is a rare-earth element) based magnet, and wherein the grain boundary phase contains a fluoride compound, and wherein a thickness of the fluoride compound is 10 μm or less, or a thickness of the fluoride compound is from 0.1 μm to 10 μm, and wherein the coverage of the fluoride compound over a main phase particle is 50% or more on average. Moreover, after layering fluoride compound powder, which is formed in plate-like shape, in the grain boundary phase, the rare earth magnet is manufactured by quenching the layered compound after melting it at a vacuum atmosphere at a predetermined temperature, or by heating and pressing the main phase and the fluoride compound to make the fluoride compound into a layered fluoride compound along the grain boundary phase. The object of the present invention is to provide a rare earth magnet which enables to achieve a good balance between high coercive force and high residual magnetic flux density, and its manufacturing method. The present invention provides a rare earth magnet in which a layered ...more ...less
10
US20110254646A1
Publication/Patent Number: US20110254646A1
Publication date: 2011-10-20
Application number: 13/169,205
Filing date: 2011-06-27
Abstract: A magnet comprising grains of a ferromagnetic material whose main component is iron and a fluorine compound layer or an oxy-fluorine compound layer of fluoride compound particles of alkali metals, alkaline earth metals and rare earth elements, present on the surface of the ferromagnetic material grains, wherein an amount of iron atoms in the fluorine compound particles is 1 to 50 atomic %. A magnet comprising grains of a ferromagnetic material whose main component is iron and a fluorine compound layer or an oxy-fluorine compound layer of fluoride compound particles of alkali metals, alkaline earth metals and rare earth elements, present on the surface of the ...more ...less
11
WO2011040126A1
Publication/Patent Number: WO2011040126A1
Publication date: 2011-04-07
Application number: 2010063612
Filing date: 2010-08-11
Abstract: Disclosed is a magnetic material in which 50% by volume of the magnetic particles are accounted for by the main phase of the magnet
12
US20100141367A1
Publication/Patent Number: US20100141367A1
Publication date: 2010-06-10
Application number: 12/708,580
Filing date: 2010-02-19
Abstract: A magnet comprising grains of a ferromagnetic material whose main component is iron and a fluorine compound layer or an oxy-fluorine compound layer of fluoride compound particles of alkali metals, alkaline earth metals and rare earth elements, present on the surface of the ferromagnetic material grains, wherein an amount of iron atoms in the fluorine compound particles is 1 to 50 atomic %. A magnet comprising grains of a ferromagnetic material whose main component is iron and a fluorine compound layer or an oxy-fluorine compound layer of fluoride compound particles of alkali metals, alkaline earth metals and rare earth elements, present on the surface of the ...more ...less
13
US20100297343A1
Publication/Patent Number: US20100297343A1
Publication date: 2010-11-25
Application number: 12/849,857
Filing date: 2010-08-04
Abstract: A fluoride coating film formed with a fluoride-containing solution wherein a rare earth fluoride or an alkaline earth metal fluoride, in particular, fluoride of Pr, Nd, Dy, Tb and Ho, is swollen in a solvent comprising a major amount of an alcohol, and the solution is a colloidal solution in which the rare earth fluoride or the alkaline earth metal fluoride is dispersed homogeneously in the solvent comprising a major amount of an alcohol improves magnetic properties of NdFeB rare earth magnets including not only sintered magnets but also bonded magnets. A fluoride coating film formed with a fluoride-containing solution wherein a rare earth fluoride or an alkaline earth metal fluoride, in particular, fluoride of Pr, Nd, Dy, Tb and Ho, is swollen in a solvent comprising a major amount of an alcohol, and the solution is a ...more ...less
14
US7770296B2
Publication/Patent Number: US7770296B2
Publication date: 2010-08-10
Application number: 11/951,886
Filing date: 2007-12-06
Inventor: Brauch, Richard L.  
Abstract: Disclosed are an optical system and method for centering a tree within a tree spade apparatus that is mounted to a vehicle. Typically, the center point of the tree spade is difficult to align with the axis of the trunk of the tree. The present embodiments describe a projected pattern of light incident upon the tree trunk that assists the operator of the tree spade in centering the spade around the tree without additional assistance. Disclosed are an optical system and method for centering a tree within a tree spade apparatus that is mounted to a vehicle. Typically, the center point of the tree spade is difficult to align with the axis of the trunk of the tree. The present embodiments describe a projected ...more ...less
15
US7816820B2
Publication/Patent Number: US7816820B2
Publication date: 2010-10-19
Application number: 92/477,907
Filing date: 2007-10-26
Abstract: A compacted magnetic core with a high resistance
16
US7847555B2
Publication/Patent Number: US7847555B2
Publication date: 2010-12-07
Application number: 05/043,808
Filing date: 2008-03-18
Abstract: A magnet which includes ferromagnetic powder to be mainly a mother phase containing iron or cobalt. The ferromagnetic powder is provided with a high-resistance layer which has a resistance higher than or equal to ten times as high as a resistance of the mother phase and a Vickers hardness lower than a Vickers hardness of the mother phase. The high-resistance layer is being formed partially or entirely on the surface of the ferromagnetic powder. A magnet which includes ferromagnetic powder to be mainly a mother phase containing iron or cobalt. The ferromagnetic powder is provided with a high-resistance layer which has a resistance higher than or equal to ten times as high as a resistance of the mother phase and a ...more ...less
17
WO2010109760A1
Publication/Patent Number: WO2010109760A1
Publication date: 2010-09-30
Application number: 2010001030
Filing date: 2010-02-18
Abstract: A sintered magnet configured from a magnetic powder containing Nd2Fe14B as the main component
18
US7806991B2
Publication/Patent Number: US7806991B2
Publication date: 2010-10-05
Application number: 64/176,506
Filing date: 2006-12-20
Abstract: A lamellar high resistance layer having resistivity ten times or higher than that of a mother phase containing iron or cobalt is formed and an oxygen content is controlled to 10 to 10000 ppm so that the reliability and residual magnetic flux density are increased.
19
US7815726B2
Publication/Patent Number: US7815726B2
Publication date: 2010-10-19
Application number: 86/233,407
Filing date: 2007-09-27
Abstract: A fluoride coating film formed with a fluoride-containing solution wherein a rare earth fluoride or an alkaline earth metal fluoride
20
US20090289748A1
Publication/Patent Number: US20090289748A1
Publication date: 2009-11-26
Application number: 12/534,530
Filing date: 2009-08-03
Abstract: The object of the present invention is to provide a rare earth magnet which enables to achieve a good balance between high coercive force and high residual magnetic flux density, and its manufacturing method. The present invention provides a rare earth magnet in which a layered grain boundary phase is formed on a surface or a potion of a grain boundary of Nd2Fe14B which is a main phase of an R—Fe—B (R is a rare-earth element) based magnet, and wherein the grain boundary phase contains a fluoride compound, and wherein a thickness of the fluoride compound is 10 μm or less, or a thickness of the fluoride compound is from 0.1 μm to 10 μm, and wherein the coverage of the fluoride compound over a main phase particle is 50% or more on average. Moreover, after layering fluoride compound powder, which is formed in plate-like shape, in the grain boundary phase, the rare earth magnet is manufactured by quenching the layered compound after melting it at a vacuum atmosphere at a predetermined temperature, or by heating and pressing the main phase and the fluoride compound to make the fluoride compound into a layered fluoride compound along the grain boundary phase. The object of the present invention is to provide a rare earth magnet which enables to achieve a good balance between high coercive force and high residual magnetic flux density, and its manufacturing method. The present invention provides a rare earth magnet in which a layered ...more ...less