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    • 62. 发明申请
    • 希土類磁石およびその製造方法
    • 稀土磁铁及其生产方法
    • WO2003001541A1
    • 2003-01-03
    • PCT/JP2002/006134
    • 2002-06-19
    • 住友特殊金属株式会社冨澤 浩之金子 裕治
    • 冨澤 浩之金子 裕治
    • H01F1/04
    • C22C28/00C22C38/002C22C38/005C22C38/06C22C38/10C22C45/02H01F1/0571H01F1/0573H01F1/0577H01F1/058H01F1/059
    • A method for producing a raw material alloy for a R−T−Q type rare earth magnet which comprises providing a melt of a R−T−Q type rare earth alloy, wherein R, T and Q represent a rare earth element, a transition metal element and at least one element selected from the group consisting of B, C, N, Al, Si and P, respectively, which contains at least one R L selected from the group consisting of Nd and Pr and at least one R H selected from the group consisting of Dy, Tb and Ho as the rare earth element R, cooling rapidly the molten alloy to prepare a rapidly solidified alloy, and subjecting the solidified alloy to a heat treatment in a temperature range of 400˚C or higher and less than 800˚C for a period of 5 min to 12 hr. The R H is transported from a grain boundary phase to a main phase during the heat treatment, which results in the increase of coercive force. The method allows the utilization without loss of a heavy rare earth element R H such as Dy added to the alloy and thus the effective improvement of coercive force.
    • 一种用于制造R-T-Q型稀土磁体的原料合金的方法,其包括提供R-T-Q型稀土合金的熔体,其中R,T和Q表示稀土元素,转变 金属元素和选自由B,C,N,Al,Si和P组成的组中的至少一种元素,其含有至少一种选自Nd和Pr的R b 和选自Dy,Tb和Ho作为稀土元素R的至少一种R b,H迅速冷却熔融合金以制备快速固化的合金,并将固化的合金 在400℃以上且小于800℃的温度范围内进行5分钟至12小时的热处理。 在热处理期间,R“s”从晶界相转移到主相,导致矫顽力的增加。 该方法允许利用而不损失添加到合金中的重稀土元素R s H S如Dy,从而有效地提高矫顽力。
    • 68. 发明申请
    • CORROSION-RESISTANT R-Fe-B BONDED MAGNET AND POWDER FOR FORMING R-Fe-B BONDED MAGNET AND METHOD FOR PREPARATION THEREOF
    • 用于形成R-Fe-B粘结磁体的耐腐蚀R-Fe-B结合磁铁和粉末及其制备方法
    • WO01020620A1
    • 2001-03-22
    • PCT/JP2000/003816
    • 2000-06-12
    • B22F1/00H01F1/053H01F1/057H01F1/06H01F1/08H01F41/02
    • H01F1/0578B22F1/0088B22F2999/00H01F1/0571H01F41/026B22F2201/05
    • A powder for forming a R-Fe-B bonded magnet, wherein an R compound, such as an R oxide, an R carbide, an R nitride or an R hydride, which is contained in a raw material powder such as a super rapidly cooled powder or a hydrogen treated powder (HDDR powder) and reacts with water vapor to change into R(OH)3, has been converted to a R hydroxide R(OH)3 being stable in the air by subjecting the raw material powder to a heat treatment in an atmosphere of a pressured water vapor. The powder for forming an R-Fe-B bonded magnet is free from the generation of a white powder in the surface of or inside a bonded magnet formed from the powder, and accordingly, is free from the occurrence of cracking, chipping, swelling or the like in the bonded magnet caused by volume expansion of a white powder. Thus, the above powder can be used for preparing an R-Fe-B bonded magnet which is free from the white powder which has been observed in a conventional R-Fe-B bonded magnet in the use for a long period of time and is reduced in the occurrence of defects such as cracking, chipping, swelling and the like.
    • 用于形成R-Fe-B粘结磁体的粉末,其中包含在诸如超快速冷却的原料粉末中的R化合物,例如R氧化物,R碳化物,R氮化物或R氢化物 粉末或氢处理粉末(HDDR粉末)并与水蒸汽反应以转化为R(OH)3,已经转化为在空气中稳定的氢氧化R(OH)3,使原料粉末受热 在压力水汽的气氛中进行处理。 用于形成R-Fe-B粘结磁体的粉末在由粉末形成的粘结磁体的表面或内部没有产生白色粉末,因此没有发生开裂,碎裂,膨胀或 由于白色粉末的体积膨胀引起的粘结磁体中的类似物。 因此,上述粉末可用于制备在常规R-Fe-B粘结磁体中长时间观察到的不含白色粉末的R-Fe-B粘结磁体,并且是 减少了诸如破裂,碎裂,膨胀等缺陷的发生。