共查询到20条相似文献,搜索用时 109 毫秒
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真空热处理改善机械研磨Sm2Fe17Nx粉末的磁性感应炉熔炼Sm2.5Fe17和Sm2.3Fe17两种成分合金,铸锭经固溶处理后破碎成45~150μm粗粉作为机械研磨(MG)的原材料。MG的时间为72~144ks。MG粉末经过1023K×1.8ks真... 相似文献
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应用电子探针,扫描电镜,X射线衍射等现代分析技术研究Sm-Fe-N合金中各相的组成,结构,以及氮化程中的相变。发现离子氮化后,磁性相Sm2Fe17Nx转变为非晶态,并且部分分解为SmFe3Nx和α-Fe相。 相似文献
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高效混合设备在钛白盐处理工艺中的应用 总被引:2,自引:0,他引:2
系统研究了Si置换部位Fe的Sm2Fe17xSix(x=0,1,2,3)化合物及其氢化物的磁性能。首次发现Sm2(Fe,Si)17化合物对应的氢化物升温时测得的居里温度比降温时测得的居高温度高,其差值为ΔTc^*。详细讨论了ΔTc^*与Sm2(Fe,Si)17化合物及其氢化物的结构稳定性的关系。 相似文献
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高性能各向同性α-Fe+Sm_2Fe_17Nx合金最近,西澳大利亚大学研究了纳米扇a-Fe+Sin。Fel,N:两相合金的结构和磁性。合金由机械合金化方法制备。所研究的原始合金成分范围是5~flat%Sin、余Fe。研磨态合金粉末由sum纳米品a-Fe... 相似文献
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永磁材料未来十年研究展望 总被引:10,自引:3,他引:7
在未来的10年里,永磁材料的研究与开发将主要呈现3个特点:磁体综合化,合金成分多元化和制备工艺高技术化。NdFeB系合金,Sm2Fe17Nx(x=2-3系合金仍将是研究的热点。 相似文献
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ZHANG Shaoying TAI Lichi CUI LiyaCentral Iron Steel Research Institute Beijing China 《金属学报(英文版)》1994,7(1):19-22
The effects of hydrogenation before nitrogenization of Sm_2Fe_(17) alloy on structure andmagnetic properties of Sm_2Fe_(17)N_x powder are studied in this paper.The unit cell volume ofSm_2Fe_(17)increases by about 3.6% and many cracks occur in Sm_2Fe_(17) particles during the process of hydrogenation.The Sm_2Fe_(17)N_x powder treaed by hydrogenation thennitrogenization has the higher content of N and the better intrinsic and technological magnetic properties than that treated by nitrogenization directly. 相似文献
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本文研究了完全氮化的(Sm1-yCey)2Fe17Nx(y = 0、0.20、0.33、0.40、0.45、0.50、0.67、0.80、1.00)粉末的磁性能和微观结构。当用33atomic%Ce代替Sm时,最大磁能积(BH)max从17.8 MGOe变为17.6 MGOe,几乎没有下降。相应的,性能/稀土价格比率提高了39.2%。 根据能量色散光谱(EDS)分析,Ce倾向于分布在REFe3 / REFe2晶界相中。XPS证实了(Sm1-yCey)2Fe17Nx中Ce离子的价态变化。 相似文献
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The isotropic Sm2Fe17Nx magnetic powders were prepared by Hydrogenation-Disproportion-Desorption-Recombination (HDDR) process. The phase and microstructure evolutionary process of Sm-Fe alloy during the solidification, homogenization, HDDR and nitration processes were investigated by means of XRD, SEM, EDX and AFM. The results show that the homogeneous Sm2Fe17 alloy wassuccessfully obtained and the impurity phases and residual stress were well removed by heated at 1050 ℃ for 24 h. When heated at 800 ℃ for 1h in H2 of 0.1 Mpa, the alloy turns into SmHx and α-Fe with plenty of nanocrystals. After vacuumized at 800 ℃ for 2h the alloy recombines into Sm2Fe17 with a crystal grain size of about 85 nm.The lattice constant of the alloy increases and the expanding of the crystal cell reaches 6.28% after nitrified at 500 ℃ for 5 h. The magnetic property of isotropic bonded Sm2Fe17Nx magnets is Br=0.6704 T, Hcj = 1015 kA·m-1,( BH )max =73.7 kJ·m-3 with a density of 6.04 g·cm-3 . 相似文献
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通过XRD分析并结合Rietveled结构精修方法研究Sm2Fe17合金的氮化后粉末的物相组成与含量,单胞的精细结构。结果表明:氮原子优先进入9e晶位,氮原子的引入导致了SmFeN晶胞的不对称畸变,致使稀土Sm的6c和3a晶位以及Fe原子的9d晶位占位过饱和,而Fe原子的6c,18f,18h晶位出现了少量缺位情况;在490℃,0.3MPa氮压力下氮化4h后,氮原子在9e晶位占位率达99.4%,获得主相的含量达97.9%(质量分数,下同),Sm2O3相为0.9%,SmN相为0.5%,α-Fe相为0.7%的高纯高氮含量的SmFeN合金粉末。 相似文献
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HD和HDDR方法对稀土铁基化合物磁特性的影响 总被引:3,自引:0,他引:3
系统介绍了HD和HDDR方法对稀土铁基化合物Nd2Fe14B和Sm2Fe17磁特性的影响,指出HD方法可以用于NdFeB永磁材料生产的中间破碎过程。HDDR方法能够制备NdFeB各向异性永磁粉末,它是目前通用的制备方法所不能达到的,Sm2Fe17N3-δ化合物制备中,HDDR方法是渗N的先期准备过程。 相似文献
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通过氢化-歧化-脱氢-重组法制备Sm2(Fe,M)17(M=Nb)合金,探讨了添加合金元素Nb对Sm2Fe17合金的微结构的影响。通过扫描电子显微镜和能谱仪、X射线衍射仪等分析手段对Sm2(Fe,M)17(M=Nb)进行测试和分析表明:添加微量的Nb元素可以有效的改善Sm-Fe合金铸态组织的显微结构。 相似文献
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Xu Rengen Wang Xinhua Wu Jianmin Pan Hongge Chen Changpin Wang Qidong Dai Lichi Department of Materials Science Engineering Zhejiang University Hangzhou P. R. China Department Central Iron Steel Research Institute 《中国有色金属学会会刊》1999,9(1)
INTRODUCTIONItiswelknownthatSm2Fe17Nycompoundshavegoodintrinsicmagneticproperties[1].BecauseofthepoorstabilityofSm2Fe17Nyat... 相似文献
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WANG Bowen YAN Rongge HAO Yanming CAO Shuying and WENG LingSchool of Electrical Engineering Hebei University of Technology Tianjin ChinaInternational Center for Materials Physics the Academy of Sciences Shenyang China 《稀有金属(英文版)》2003,22(1)
The structure, magnetization, and magnetocrystalline anisotropy were investigated using X-ray diffraction, vibrating sample magnetometer, and AC susceptibility-meter. It is found that the microstructure of (Sm0.5Nd0.5)2(Fe1-xCox)17 alloys is an (Sm,Nd)2(Fe,Co)17 phase with the rhombohedral Th2Zn17-type structure. The Curie temperature Tc increases with the Co concentration increasing, and the magnetization first increases as the Co content increases in (Sm0.5Nd0.5)2(Fe1-xCox)17 alloys and then decreases slowly. The easy magnetization direction (EMD) of (Sm0.5Nd0.5)2(Fe0.25Co0.75)17 is along the c-axis and a strong enhancement of the crystalline anisotropy energy constant K is produced by the addition of some Co atoms. The anisotropy energy constant reaches the maximum when x = 0.75 and then decreases slowly with the Co content further increasing. The (Sm0.5Nd0.5)2(Fe0.25Co0.75)17compound is an optical candidate for the new permanent magnet, which possesses a high magnetization, a high Curie temperature, 相似文献
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G. V. Ivanova G. M. Makarova Ye. V. Shcherbakova Ye. V. Belozerov A. S. Yermolenko 《Journal of Alloys and Compounds》1997,260(1-2):139-142
The phase content of the Sm(Fe1−xSix)y alloys (0.05≤x≤0.15; 8.5≤y≤12) has been studied by X-ray diffraction using micromonocrystals. The compounds Sm2(Fe,Si)17, Sm(Fe,Si)12 and a novel Sm3(Fe,Si)29 compound with a monoclinic unit cell are found. The lattice parameters of Sm3(Fe,Si)29 are: a=1.056 nm, b=0.850 nm, c=0.966 nm, β=96.8°. This compound forms as a result of a solid state transformation from the high-temperature Sm2(Fe,Si)17 phase. Diffuse effects observed in rocking photographs suggest transition structures arising from this transformation. The Curie temperatures of Sm3(Fe,Si)29 vary in the interval 496–521 K. 相似文献