-
公开(公告)号：CA2685790C
公开(公告)日：2015-12-08
申请号：CA2685790
申请日：2008-04-21
Applicant: INTERMETALLICS CO LTD
Inventor： SAGAWA MASATO
Abstract: The objective of the present invention is to provide a method for making a NdFeB system sintered magnet, capable of enhancing the effect of increasing the coercive force and preventing the instability of the effects, and in addition, being inexpensive. The method for making a NdFeB system sintered magnet according to the present invention has processes of coating a NdFeB system sintered magnet with a powder containing Dy and/or Tb, then heating the NdFeB system sintered magnet, and thereby diffusing Rh in the powder into the NdFeB system sintered magnet through a grain boundary, and is characterized in that the powder contains 0.5 through 50 weight percent of Al in a metallic state; and the amount of oxygen contained in the NdFeB system sintered magnet is equal to or less than 0.4 weight percent.
-
公开(公告)号：DE69822732T2
公开(公告)日：2005-03-17
申请号：DE69822732
申请日：1998-09-01
Applicant: INTERMETALLICS CO LTD , TOMOEGAWA PAPER MFG CO LTD
Inventor： SAGAWA MASATO , ITATANI OSAMU , FUJIWARA AKIRA
Abstract: The powder coating of the present invention was used for a method for forming coatings comprising the steps of making the powder coating adhere to an adhesive layer previously formed on the surface of a material to be coated, and then heating it, thereby forming a coating, comprising a resin particle containing a thermosetting resin, and a particle containing a curing agent.
-
公开(公告)号：ES2096814T3
公开(公告)日：1997-03-16
申请号：ES93112806
申请日：1993-08-10
Applicant: INTERMETALLICS CO LTD
Inventor： SAGAWA MASATO , WATANABE HIROSHI , NAGATA HIROSHI
-
公开(公告)号：CA2685790A1
公开(公告)日：2008-11-20
申请号：CA2685790
申请日：2008-04-21
Applicant: INTERMETALLICS CO LTD
Inventor： SAGAWA MASATO
Abstract: The invention aims at providing a process for the production of NdFeB sin tered magnets which can bring about higher coercive force improving effect a nd smaller scattering of the effect and which enables the production of the magnets at a low cost. A process for the production of NdFeB sintered magnet s which comprises applying a powder containing Dy and/or Tb to an NdFeB sint ered magnet and heating the resulting magnet to diffuse the Rh contained in the powder into the magnet through grain boundaries, characterized in that t he powder contains 0.5 to 50wt% of metallic Al and the oxygen content of the NdFeB sintered magnet is 0.4wt% or below.
-
公开(公告)号：DE69617792T2
公开(公告)日：2002-08-08
申请号：DE69617792
申请日：1996-04-04
Applicant: INTERMETALLICS CO LTD
Inventor： SAGAWA MASATO , NAGATA HIROSHI , WATANABE TOSHIHIRO
Abstract: The present invention relates to a method in which a magnetic powder is packed into a cavity (c) of a rubber mold (m) comprising a rubber material at least a part of which is a mixture of rubber and magnetic powder, and then the rubber mold filled with the magnetic powder are subjected to a magnetic field and a pressure with punches (2a , 2b), thereby compressing the powder to form powder compact. This makes the distribution of magnetic field in the cavity of the rubber mold more homogeneous, and therefore, the distortion, cracking and chipping caused by inhomogenity of the distribution of the magnetic field are prevented, and the resultant powder compact becomes more near-net-shaped i.e., closer to the end product.
-
Patent Agency Ranking
公开(公告)号：DE69127557T2
公开(公告)日：1998-01-08
申请号：DE69127557
申请日：1991-11-28
Applicant: INTERMETALLICS CO LTD
Inventor： SAGAWA MASATO , NAGATA HIROSHI , SHIRAI HIROO
IPC: B22F3/00 , B22F3/02 , B22F3/12 , B22F3/22 , B30B11/00 , B30B11/02 , B30B15/02 , B30B15/30 , H01F41/02 , H01F1/053
Abstract: In the die-pressing method of the magnet powder and fine powder, the powder is filled at a high density in a rubber mold (10), is occasionally preliminarily magnetized (4a) in the rubber mold and is then compacted under magnetic field or without magnetic field. Cracking of the magnet green compact is prevented. A sintered compact having density of 90% or more can be produced using the fine powder.
-
公开(公告)号：AT157806T
公开(公告)日：1997-09-15
申请号：AT94116105
申请日：1991-11-28
Applicant: INTERMETALLICS CO LTD
Inventor： SAGAWA MASATO , NAGATA HIROSHI , SHIRAI HIROO
IPC: B22F3/00 , B22F3/02 , B22F3/12 , B22F3/22 , B30B11/00 , B30B11/02 , B30B15/02 , B30B15/30 , H01F41/02 , H01F1/053
Abstract: In the die-pressing method of the magnet powder and fine powder, the powder is filled at a high density in a rubber mold (10), is occasionally preliminarily magnetized (4a) in the rubber mold and is then compacted under magnetic field or without magnetic field. Cracking of the magnet green compact is prevented. A sintered compact having density of 90% or more can be produced using the fine powder.
-
公开(公告)号：AT148641T
公开(公告)日：1997-02-15
申请号：AT93112806
申请日：1993-08-10
Applicant: INTERMETALLICS CO LTD
Inventor： SAGAWA MASATO , WATANABE HIROSHI , NAGATA HIROSHI REIJENCE OYAGI
-
公开(公告)号：CA2696700C
公开(公告)日：2016-03-15
申请号：CA2696700
申请日：2008-08-20
Applicant: INTERMETALLICS CO LTD , MITSUBISHI CORP
Inventor： SAGAWA MASATO
Abstract: The objective of the present invention is to provide a method for making a NdFeB system sintered magnet without an occurrence of a curve or deformation, by using a mold which is inexpensive, easy to be machined, and will not be embrittled. The present invention also provides such a mold. In the present invention, at least a part (e.g. a bottom plate 11) in the mold is made of a carbon material. This enables a production of a NdFeB system sintered magnet without an occurrence of a curve or deformation caused by a friction due to a sintering shrinkage, because the friction between a carbon material and a sintered compact in a sintering process is lower than that between metal and a sintered compact. What is more, a carbon material is advantageous in that it is inexpensive, easy to be machined, and will not be embrittled even after repeated uses of the mold. Such effects can be particularly obtained by using a carbon material as the bottom plate 11, which is subjected to the load of the sintered compact in the sintering process.
-
公开(公告)号：MX2009011341A
公开(公告)日：2010-04-01
申请号：MX2009011341
申请日：2008-04-21
Applicant: INTERMETALLICS CO LTD
Inventor： SAGAWA MASATO
Abstract: La invenci?n tiene como objetivo proporcionar un proceso para la producci?n de imanes sinterizados de NdFeB los cuales pueden dar lugar a una fuerza coercitiva m?s alta mejorando el efecto y dispersi?n m?s peque?a del efecto y lo cual permite la producci?n de los imanes a un bajo costo. Un proceso para la producci?n de imanes sinterizados de NdFeB que comprende aplicar un polvo que contiene Dy y/o Tb a un im?n sinterizado de NdFeB y calentar el im?n resultante para difuminar el Rh contenido en el polvo en el im?n a trav?s de los l?mites de grano, caracterizado en que el polvo contiene 0.5 hasta 50% en peso de Al met?lico y el ox?geno contenido del im?n sinterizado de NdFeB es 0.4% en peso o inferior.
-
-
-
-
-
-
-
-
-
Search Results
69
records
(took 0.021 seconds)
