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    • 5. 发明授权
    • Process for producing rare earth-cobalt permanent magnet
    • 稀土钴永磁体的制造方法
    • US4875946A
    • 1989-10-24
    • US153503
    • 1988-02-02
    • Shiang-Jiun HehSwe-Kai ChenFu-Teh JinLi-Kou Chen
    • Shiang-Jiun HehSwe-Kai ChenFu-Teh JinLi-Kou Chen
    • C22C1/04C22F1/10H01F1/055
    • C22F1/10C22C1/0441H01F1/0557
    • A heat-treatment process for producing rare earth-cobalt permanent magnets having relatively high and reproducible magnetic properties wherein one or more controlled cooling rates are applied in temperatures ranging from a sintering temperature and the isothermal annealing temperature. The controlled cooling rates are preferably divided into two steps. In the first step, the cooling rate is preferably greater than 10.degree. C./min. In the second step, the cooling rate is preferably less than 10.degree. C./min. and is ideally in the range of 2.degree.-4.degree. C./min. By the heat-treatment process of this invention, a permanent magnet having a high intrinsic coercivity of more than 20 kOe, a maximum energy product of greater than 19 MGOe, and a coercivity of greater than 8.1 kOe can be reproducibly obtained.
    • 一种用于生产具有相对高且可再现的磁性能的稀土 - 钴永磁体的热处理方法,其中在烧结温度和等温退火温度范围内施加一个或多个控制冷却速率。 控制冷却速度优选分为两个步骤。 在第一步骤中,冷却速度优选大于10℃/分钟。 在第二步中,冷却速度优选小于10℃/分钟。 理想的温度范围为2°-4℃/ min。 通过本发明的热处理工艺,可以重复地获得具有大于20kOe的高固有矫顽力,大于19MGOe的最大能量积和大于8.1kOe的矫顽力的永磁体。
    • 6. 发明授权
    • Design for manufacturing magnetic recording medium
    • 磁记录介质制造设计
    • US6124002A
    • 2000-09-26
    • US227633
    • 1994-04-14
    • Li-Kou ChenWu-Geng Peng
    • Li-Kou ChenWu-Geng Peng
    • G11B5/845H01F1/00
    • G11B5/845
    • A method to manufacture magnetic recording medium including the step of subjecting the unfinished magnetic recording medium to a random orientation device prior to a drying step, to thereby remove the magnetic anisotropy of the magnetic recording medium caused by the preferential orientation of ferromagnetic fine particles along the travelling direction of the unfinished magnetic recording during the application of a magnetic coating composition onto a non-magnetic support strip. The random orientation device includes a magnet, which is oriented parallel to the plane of the non-magnetic strip and generates a set of lines of magnetic field. Each set of lines of magnetic fields are associated with only one magnet and contain both forward and backward directional magnetic fields in a direction perpendicular to the travelling direction of the unfinished magnetic recording medium. More than one magnet can be used; however, each magnet generates a separate and independent set of such lines of magnetic field.
    • 一种制造磁记录介质的方法,包括以下步骤:在干燥步骤之前对未完成的磁记录介质进行随机取向装置,从而除去沿着铁磁细颗粒的优先取向引起的磁记录介质的磁各向异性 在将磁性涂料组合物施加到非磁性支撑条上时,未完成的磁记录的行进方向。 随机取向装置包括磁铁,其平行于非磁性带的平面定向并产生一组磁场线。 每组磁场线仅与一个磁体相关联,并且在垂直于未完成的磁记录介质的行进方向的方向上包含正向和反向定向磁场。 可以使用多个磁体; 然而,每个磁体产生一组分离且独立的这样的磁场线。