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

研究了Sm-Fe-(C，N)和Nd-Fe-Mo-N系中交换弹簧磁体的可能性，制备了由纳米晶软磁α-Fe相和硬磁Sm_2Fe_&lt；17&gt；(C，N)_x和Nd(Fe，Mo)_&lt；12&gt；N_x相组成的微双相结构。在本研究中，通过对具有非晶态的熔体快淬带进行退火热处理来制备微双相结构。研究了Sm含量低于Sm_2Fe_&lt；17&Gt；C的化学计量比的氮化处理后Sm_yFe_&lt；95-y&Gt；C_5(y=5~10)薄带的磁性能与显微组织的关系。在初生态，Sm_&lt；7-10&gt；Fe_&lt；85-88&gt；C_5(y=7-10)薄带仅由非晶相组成，而在Sm_5Fe_&lt；90&gt；C_5(y=5)和Sm_6Fe_&lt；91&gt；C_5(y=6)薄带中也观察到了α-Fe相。在y=5和6的薄带中，熔体淬火时可以通过晶化形成α-Fe相。在所有情况下，在600ﾟC以上退火后，非晶相消失，产生I…更多的是具有α-Fe和Sm_2Fe_(？)lt；17&gt；C_x相的微双相结构。Sm_&lt；7-10&gt；Fe_&lt；85-88&gt；C_5薄带经退火和氮化后具有较高的矫顽力。其中，Sm_7Fe_&lt；88&gt；C_5薄带在600ﾟC下退火5min，然后在450ﾟC下氮化4h，其矫顽力为269kAm^&lt；-1&gt；，最大能积为70.1kJm^-3&gt；在NdFeMoN熔体快淬带中，具有ThMn12型结构的Nd(Fe，Mo)lt；12相和α-Fe相的晶化温度分别在600ﾟC和500ﾟC左右。在900ﾟC热处理30min，550kAm℃渗氮4h后，Nd9&gt；Fe&lt；11&gt；Mo_&lt；0.9&gT；N_X薄带的矫顽力为240kAm^-1&gt；。V的加入提高了矫直力，当Nd0.9Nx；(Fe0.9V0.02&gt；)11ﾟC退火30min，550ﾟC氮化4h时，获得的最大矫直力为312kAm^-1。结果表明，Sm-Fe-C-N和Ndt；1-Delta&gt；(Fe，Mo)&lt；12&gt；N_X熔体快淬带具有较高的磁性能。较少

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