共查询到18条相似文献,搜索用时 296 毫秒
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Sm2Fe17N3各向异性磁体Sm2Fe17N3是通过往Sm2Fe17中引进氮原子而获得的磁体,大幅度地提高了磁性,并且是一种通过固相-气相反应开发新型磁性化合物的新技术而受到关注。这种磁性材料的特性受氮化处理工艺过程参数所左右,很难加以精确控制。作... 相似文献
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在不同的温度和时间下对Sm2Fe17合金进行氮化处理,利用Kerr显微镜和透射电镜(TEM)观察磁畴及氮化层,氮化处理之前在Sm2Fe17合金中观察不到磁畴,但在氮化处理后可观察到许多磁畴及裂纹。氮化层的厚度约10μm。通过扫描电镜(SEM),俄歇电镜(SAM)以及电子探针微区分析(EPMA)对合金进行了定性,半定性和定量的成分分析。 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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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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钛在自贡鸿鹤化工总厂联碱生产中的应用 总被引:7,自引:1,他引:7
简述了Sm2Fe(17)Nx化合物的结构与内禀磁性能,着重回顾了Sm2Fe(17)Nx永磁合金粉及其磁体的制备工艺发展现状,并展望了Sm2Fe(17)Nx永磁体的发展前景。 相似文献
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Sm2(Fe1—xCrx)17N~2.7永磁材料的结构与磁性能 总被引:3,自引:0,他引:3
研究了Cr部分取代Fe对Sm2(Fe1-xCrx)17N~2.7磁粉磁特性的影响。添加少量Cr(x=0-0.1),该化合物的结构不变化。随Ce含量的增加,它的Curie温度、各向异性场饱和磁化强度、平均Fe原子磁矩和平均超精细场均有所降低。材料的单相性显著改善,矫顽力提高。Sm2(Fe0.95Cr0.05)17N~2.7磁粉的矫顽力iHc达到1592kA/m。 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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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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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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DAI Ya-nan VAN Mu-fu LEI Ting-quan WU Kun School of Materials Science Engineering Harbin Institute of Technology Harbin China 《材料热处理学报》2004,25(5)
PLASMA NITRIDING has developed rapidly over thepast a few years to improve surface properties such aswear,fatigue and corrosion resistance[1'2].Thecombined diffusion/precipitation/compound layerformation reactions make it rather difficult to model thenitriding process.Several attempts have been made byothers.The internal nitridation model is suitable fordescribing the nitriding processing of the matrixwithout carbon,in which there are no formation ofcarbides in surface layer I3).Sun and … 相似文献
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烧结材料孔隙形态与分布对离子氮碳共渗层组织结构的影响 总被引:1,自引:0,他引:1
研究了烧结材料孔隙形态与分布对离子氮碳共渗层组织结构的影响。试验表明,随试样孔隙数量的增加,γ'相含量和扩散层深度增加。由于试样的正压制面与侧压制面的孔隙形态及分布不同,导致化合物层深度和相组成不同。还观察讨论了氮原子在氮碳共渗层的分布状态。 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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INTRODUCTIONThehighCurietemperatureandlowesttempera turecoefficientoftheSm2 Co17permanentmagnetsmakethembeidealcandidatesforhight 相似文献