Development of Spring-type Magnet in Nitrogen Contained Rare-earth-Fe Compounds

含氮稀土铁化合物弹簧型磁体的研制

基本信息

批准号：
06650768
负责人：
SUGIMOTO Satoshi
金额：
$ 1.28万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

Possibility of the exchange-spring magnets in Sm-Fe-(C,N) and Nd-Fe-Mo-N systems has been studied by preparing the microduplex structure consisting of a nanocrystalline soft magnetic alpha-Fe phase and a hard magnetic Sm_2Fe_<17> (C,N) _x and Nd (Fe, Mo) _<12>N_x phase. In this study, the microduplex structure was prepared by annealing the melt-spun ribbons with amorphous state. The magnetic properties of annealed Sm_yFe_<95-y>C_5 (y=5-10) ribbons after nitriding, whose Sm content was lower than the stoichiometric composition of Sm_2Fe_<17>C,were investigated in correlation with their microstructures. In as-spun state, Sm_<7-10>Fe_<85-88>C_5 (y=7-10) ribbons consist only of amorphous phase, while in the Sm_5Fe_<90>C_5 (y=5) and Sm_6Fe_<91>C_5 (y=6) ribbons an alpha-Fe phase is also observed. The alpha-Fe phase in the ribbons with y=5 and 6 can be formed by the crystallization during melt-quenching. In all cases, the amorphous phase disappears after the annealing above 600ﾟC,resulting i … More n the microduplex structure with alpha-Fe and Sm_2Fe_<17>C_x phases. Relatively high coercivities were observed in Sm_<7-10>Fe_<85-88>C_5 ribbons after annealing and subsequent nitriding. Especially, Sm_7Fe_<88>C_5 ribbon annealed at 600ﾟC for 5min and subsequently nitrided at 450ﾟC for 4h exhibits the coercivity of 269kAm^<-1> with the maximum energy product of 70.1kJm^<-3>. In Nd-Fe-Mo-N melt-spun ribbons, the crystallization temperatures of Nd (Fe, Mo) _<12> phase with ThMn12-type structure and alpha-Fe phase are at around 600ﾟC and 500ﾟC,respectively. Nd_<0.9>Fe_<11>Mo_<0.9>N_X ribbon after heat treatment at 900ﾟC for 30 min and subsequent nitriding at 550ﾟC for 4h exhibits coercivity of 240kAm^<-1>. The V addition increases coercivity and the highest coercivity of 312kAm^<-1> can be obtained with the Nd_<0.9> (Fe_<0.98>V_<0.02>) _<11>Mo_<0.9>N_X ribbon annealed at 900ﾟC for 30min and nitrided at 550ﾟC for 4h. It can be concluded that Sm-Fe-C-N and Nd_<1-delta> (Fe, Mo) _<12>N_X melt-spun ribbons show a relatively high magnetic properties. Less

通过制备由纳米晶软磁α-Fe相和硬磁Sm_2Fe_<组成的微双相结构，研究了Sm-Fe-(C,N)和Nd-Fe-Mo-N体系中交换弹簧磁体的可能性。 17> (C,N) _x 和 Nd (Fe, Mo) _<12>N_x 相在本研究中，通过退火制备了微双相结构。研究了Sm含量低于Sm_2Fe_<17>C化学计量组成的退火后Sm_yFe_<95-y>C_5(y=5-10)带材的磁性能。在初纺状态下，Sm_<7-10>Fe_<85-88>C_5 与其微观结构的相关性。 (y=7-10)薄带仅由非晶相组成，而在Sm_5Fe_<90>C_5(y=5)和Sm_6Fe_<91>C_5(y=6)薄带中也观察到α-Fe相。 y=5和6的薄带中的-Fe相均可以通过熔融淬火过程中的结晶形成。在所有情况下，非晶相在上述退火后消失。 600°C，在退火和随后的氮化后，在Sm_<7-10>Fe_<85-88>C_5带中观察到具有α-Fe和Sm_2Fe_<17>C_x相的微双相结构。特别是，Sm_7Fe_<88>C_5带材在600℃退火在 Nd-Fe-Mo-N 熔纺带材中，经过 5 分钟并随后在 450°C 氮化 4 小时，其矫顽力为 269kAm^<-1>，最大磁能积为 70.1kJm^<-3>。 ThMn12型结构的Nd(Fe,Mo)_<12>相和α-Fe相的含量约为分别在 600°C 和 500°C 下，Nd_<0.9>Fe_<11>Mo_<0.9>N_X 带材在 900°C 热处理 30 分钟并随后在 550°C 氮化 4h 后表现出 240kAm^<- 的矫顽力。 1>.V的添加提高了矫顽力，最高矫顽力Nd_<0.9>(Fe_<0.98>V_<0.02>)_<11>Mo_<0.9>N_X带材经900℃退火30min，550℃氮化4h可得到312kAm^<-1>可以得出Sm-Fe-C-N和Nd_<1-δ>。 (Fe,Mo)_<12>N_X熔纺薄带表现出较高的磁性能。