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    • 6. 发明授权
    • Magnetic material
    • 磁性材料
    • US06676772B2
    • 2004-01-13
    • US10098568
    • 2002-03-18
    • Akiko SaitoTadahiko KobayashiTakao SawaMasashi Sahashi
    • Akiko SaitoTadahiko KobayashiTakao SawaMasashi Sahashi
    • H01F1055
    • H01F1/015F25B21/00Y02B30/66
    • The magnetic material for magnetic refrigeration of the present invention is characterized by exhibiting, in a certain temperature region, preferably, only in part of a temperature region from 200 K to 350 K, an inflection point at which a second order differential coefficient of a magnetization curve changes from positive to negative with respect to a magnetic field, within the range of this magnetic field formed using a permanent magnet unit. This magnetic material of the present invention can generate a low temperature by using a relatively low magnetic field, by transferring the entropy between the electron spin system and the lattice system near the temperature at which an inflection point appears on the magnetization curve. Examples of the magnetic material meeting this condition are La(Fe,Si)13, (Hf,Ta)Fe2, (Ti,Sc)Fe2, and (Nb,Mo)Fe2, each containing 50 to 60 atomic % of transition metals such as Fe.
    • 本发明的磁性制冷用磁性材料的特征在于,在一定的温度范围内优选仅显示200K〜350K的温度区域的一部分,其中磁化强度的二阶微分系数 在使用永久磁铁单元形成的该磁场的范围内,曲线相对于磁场从正向变化为负。 本发明的这种磁性材料可以通过在电磁自旋系统和晶格系统之间传递熵在靠近磁化曲线上出现拐点的温度下,通过使用较低的磁场而产生低温。 满足该条件的磁性材料的实例是La(Fe,Si)13,(Hf,Ta)Fe 2,(Ti,Sc)Fe 2和(Nb,Mo)Fe 2,每个含有50至60原子%的过渡金属 如Fe。
    • 10. 发明申请
    • Magnetic refrigeration material and method of manufacturing thereof
    • 磁性制冷材料及其制造方法
    • US20060213580A1
    • 2006-09-28
    • US11365683
    • 2006-03-02
    • Hideyuki TsujiAkiko SaitoTadahiko Kobayashi
    • Hideyuki TsujiAkiko SaitoTadahiko Kobayashi
    • H01F1/057
    • H01F1/015C22C30/00C22C38/002C22C38/005C22C38/02
    • A magnetic material comprising a NaZn13 type crystal structure with uniform and fine microstructure exhibiting excellent characteristics as a magnetic refrigeration material, and a method of manufacturing the magnetic refrigeration material are provided. An alloy composition for forming magnetic material of the NaZn13 type crystal structure was melted comprising 0.5 atomic percent to 1.5 atomic percent of B to molten metal. The molten metal is rapidly cooled and solidified by a forced cooling process. Then, a rapidly cooled alloy having the NaZn13 type crystal structure was obtained. In this manner, magnetic materials comprising the NaZn13 type crystal structure phase, or the NaZn13 type crystal structure phase accompanied with other phases such as α-Fe phase having very small phase regions was manufactured without requiring heat treatment for a long time. As the result, productivity of manufacturing the magnetic refrigeration material is remarkably enhanced.
    • 提供了包含具有显示出作为磁性制冷材料的优异特性的均匀和微细微结构的NaZn 13 N型晶体结构的磁性材料以及制造磁性制冷材料的方法。 用于形成NaZn 13型晶体结构的磁性材料的合金组合物熔融包含0.5原子%至1.5原子%的B与熔融金属。 熔融金属通过强制冷却过程迅速冷却和固化。 然后,获得具有NaZn 13 N型晶体结构的快速冷却的合金。 以这种方式,包含NaZn 13+型晶体结构相的磁性材料或NaZn 13 N型晶体结构相伴随着诸如α-Fe相之类的其它相,具有非常小的 在不需要长时间热处理的情况下制造相区。 结果,制造磁性制冷材料的生产率显着提高。