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采用HDDR及氮化工艺制备了Sm2Fe16.5Ti0.5Ny粉末。铸态Sm2Fe16.5Ti0.5合金存在择优取向,Sm2(Fe,Ti)17主相的214衍射峰增强。均匀化退火后,只有约0.6%的-αFe(Ti)相与主相Sm2(Fe,Ti)17共存。经不同循环的HDDR工艺处理后,物相组成不发生变化,但-αFe(Ti)相含量增加。HDDR工艺有助于获得细晶结构,提高磁粉的矫顽力。HDDR处理的合金的氮化由初期的Sm-Fe-Ti合金与氮快速反应阶段及后期氮在合金中的均匀化扩散阶段组成。随着氮化时间的延长,富铁相含量增加。氮化物中Sm2(Fe,Ti)17Ny主相的晶格膨胀行为由HDDR与氮化工艺共同决定。在500℃氮化2h后,796kA/m最大外场下得到的最大矫顽力为164.9kA/m,氮化12h时后得到最大剩磁45.7Am2/kg。
Sm2Fe16.5Ti0.5Ny powder was prepared by HDDR and nitridation process. The as-cast Sm2Fe16.5Ti0.5 alloy has the preferred orientation, and the 214 diffraction peak of the Sm2 (Fe, Ti) 17 main phase is enhanced. After the homogenization annealing, only about 0.6% of the -αFe (Ti) phase coexists with the main phase Sm2 (Fe, Ti) 17. After different cycles of HDDR process, the phase composition does not change, but -αFe (Ti) phase content increased. The HDDR process helps achieve fine grain structure and enhances the coercivity of the magnetic powder. The nitridation of the HDDR-treated alloy consists of the initial Sm-Fe-Ti alloy rapid reaction stage with nitrogen and the late stage nitrogen homogenization diffusion stage in the alloy. With the extension of nitriding time, the iron-rich phase content increased. The lattice expansion behavior of Sm2 (Fe, Ti) 17Ny main phase in nitride is determined by HDDR and nitriding process. The maximum coercivity at 796kA / m was 164.9kA / m after nitriding at 500 ℃ for 2h, and the maximum remanence was 45.7Am2 / kg after nitriding for 12h.