公开(公告)号：WO1995031818A1

公开(公告)日：1995-11-23

申请号：PCT/JP1995000908

申请日：1995-05-12

Applicant: TDK CORPORATION

Inventor： TDK CORPORATION ,  TAGUCHI, Hitoshi ,  HIRATA, Fumihiko ,  TAKEISHI, Taku ,  MORI, Teruo

IPC: H01F01/11

CPC classification number: C04B35/2683

Abstract: A magnet manufacturing method in which a calcinated hexagonal-system Ba ferrite is pulverized, formed in a magnetic field, and sintered. The ferrite contains Si components such as SiO2 and Sr components such as SrCO3, and consequently the structure of the sintered body has a main phase of Ba ferrite and contains Sr and Si as intercrystalline components. The anisotropy of shrinkage factor is low, deformation during sintering is small, grinding after sintering can be simplified or omitted, and the density after sintering is high. The coercive force of the magnet is much improved.

Abstract translation: 一种磁体制造方法，其中煅烧的六方晶系Ba铁氧体在磁场中粉碎并烧结。 铁素体含有诸如SiO 2和Si组分的诸如SrCO 3的Si组分，因此烧结体的结构具有Ba铁氧体的主相，并且包含Sr和Si作为晶间组分。 收缩率的各向异性低，烧结时的变形小，烧结后的研磨可以简化或省略，烧结后的密度高。 磁铁的矫顽力大大提高。

公开(公告)号：WO1993022777A1

公开(公告)日：1993-11-11

申请号：PCT/JP1992000902

申请日：1992-07-15

Applicant: TDK CORPORATION

Inventor： TDK CORPORATION ,  TAGUCHI, Hitoshi ,  HIRATA, Fumihiko ,  TAKEISHI, Taku ,  MORI, Teruo

IPC: H01F01/11

CPC classification number: C04B35/26 ,  C04B35/2683 ,  C04B35/632 ,  H01F1/11 ,  H01F1/112

Abstract: A slurry containing ferrite particles and an organic solvent is wet molded in a magnetic field while removing the organic solvent, to obtain a molded article. This molded article is sintered to provide an anisotropic ferrite magnet. In this case, a surfactant is added to the slurry during wet molding. In addition to the surfactant or in place thereof, the ferrite particles are pulverized so as to impart at least 1 x 10 of strain of a (206) plane measured by X-ray diffraction, and to reduce iHc preferably below 3.5 kOe. In these ways, orientation of the molded article can be drastically improved, and extremely high magnetic characteristics can be obtained.

Abstract translation: 含有铁氧体颗粒和有机溶剂的浆料在除去有机溶剂的同时在磁场中湿成型，得到成型品。 将该成形品烧结成各向异性铁氧体磁铁。 在这种情况下，在湿法成型期间将浆料中加入表面活性剂。 除了表面活性剂或其代替之外，将铁氧体颗粒粉碎以使得通过X射线衍射测量的（206）面的至少1×10 -4的应变，并将iHc优选降低至3.5以下 奥斯特。 通过这些方式，可以显着提高成形体的取向性，能够获得极高的磁特性。

公开(公告)号：WO1993022467A1

公开(公告)日：1993-11-11

申请号：PCT/JP1992000574

申请日：1992-05-01

Applicant: TDK CORPORATION

Inventor： TDK CORPORATION ,  MORI, Teruo ,  OKAMOTO, Shigeo ,  HIROSE, Kazunori

IPC: C22C01/02

CPC classification number: C22C1/02 ,  C30B11/00 ,  C30B29/52

Abstract: When a single-crystal magnetostrictive material containing R (rare earth metal element) and TM (transition metal element) and having a dendrite structure is produced, the present invention is directed to eliminate the limitation of a continuously producible length, to suppress wastes of materials and useless power, and to facilitate regulation of a feed current to a heater. Furthermore, the present invention is directed to produce a high quality crystalline member devoid of disorder of a crystal arrangement and having a great magnetostrictive quantity at a low cost. The present invention uses a single-crystal magnetostrictive material production apparatus including a hopper (10) for accommodating starting materials (1), means (20) for continuously feeding the starting materials (1) in a unit quantity per unit time into a casting mold (30), a heater (40) for melting the starting materials (1) in the casting mold (30), elevation means for relatively raising the heater (40) with respect to the starting materials (1) fed, and means for radiating the heat of the molten starting materials.