崔春翔
从事原位金属基复合材料、磁性材料及生物材料制备科学和微结构研究。
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- 姓名:崔春翔
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学术头衔:
博士生导师
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学科领域:
材料科学基础学科
- 研究兴趣:从事原位金属基复合材料、磁性材料及生物材料制备科学和微结构研究。
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1998
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0
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成果阅读
405
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成果数
10
崔春翔, CUI
Sci China Ser E-Tech Sci April 2007, Vol. 50, No. 2, 184-189,-0001,():
-1年11月30日
Sm3(Fe,Ti)29Nx/α-Fe dual-phase nanometer magnetic material was fabricated through rapid solidification, crystallization and nitridation of Sm-Fe (Ti) alloy. The effect of combination of rapid solidification and Ti alloy addition on the phase formation and microstructure of the Sm-Fe alloy is investigated in this paper. The microstructure of amorphous phase and dual-phase nano-grain crystals before and after crystallization annealing were observed using a high-resolution transmission electron microscope (HREM). The dual-phase nano-grains after annealing were compacted together with a clear interface with the direct exchange-coupling mechanism. Different annealing processes were used to examine the melt-spun alloy. Comparison of the images of SEM showed that annealing at 750℃ for 10 min was most suitable to get homogeneous and nano-grains. No obvious kink was detected in the second quadrant of the hysteresis loop like a single hard magnet, and strong exchange coupling was found between hard magnets and soft magnets.
rapid solidification, microstructure, Sm3(, Fe,, Ti), 29Nx/, α-Fe, dual phase nanocomposite, exchange-coupling
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崔春翔, Chunxiang
Acta Materialia 52 (2004) 5757-5760,-0001,():
-1年11月30日
Single-crystal MgB2 nanoparticles, with diameters in the range 20–100 nm, have been synthesized in situ in the sample chamber of an X-ray diffractometer. The reaction kinetics are analyzed and related to the atomic-level structure of the particles as observed by high-resolution electron microscopy. Synthesis conditions may have a significant influence on microstructure and superconducting properties.
Single
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崔春翔, Chunxiang
ADVANCED ENGINEERING MATERIALS 2003, 5, No. 10,-0001,():
-1年11月30日
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崔春翔, Y.
Materials Science and Engineering A xxx (2006) xxx-xxx,-0001,():
-1年11月30日
A
Hard
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崔春翔, Ji-Bing
Materials Chemistry and Physics 97 (2006) 116-120,-0001,():
-1年11月30日
Sm2Fe16Ti1Ny powder is synthesized by HDDR treatment and nitrogenation. As-cast Sm2Fe16Ti1 alloy has a few preferred directions. The main phase of Sm3(Fe,Ti)29 and the secondary phases of SmFe11Ti, SmFe2 or Sm(Fe,Ti)2 as well as little-Fe(Ti) coexist in as-cast alloy. In the as-homogenized ingot, the main phase Sm3(Fe,Ti)29 still co-exists with Fe9.5SmTi1.5, SmFe11Ti and a few Sm-rich phases. When Sm2Fe16Ti1 alloy is treated by different cycles of HDDR process, the Sm2(Fe,Ti)17 main phase and a little-Fe(Ti) present. Moreover, HDDR process contributes to the cracks of powder and grain boundaries. After the powder was nitrogenated for less than 12 h, the phase compositions are not changed any more, where the content of Fe-rich phases is increasing with respect to nitrogenation time. Moreover, the diffraction peaks of Fe-rich phases are little shifted to lower angle side. The nitrogenation process mainly includes two stages, one is fast reaction and diffusion between nitrogen atoms and Sm–Fe–Ti phases, the other is long-time homogenized diffusion of nitrogen. The optimal coercivity of 1859 Oe is obtained at nitriding 6 h, and the excellent magnetization of 126.4 emug−1 and remanence of 48.3 emug−1 are presented at nitriding 12 h.
Sm2Fe16Ti1Ny,
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崔春翔, Chunxiang
Physica B 351 (2004) 151-157,-0001,():
-1年11月30日
Sm2Fe17xTixN compounds were prepared from the starting Sm2Fe17xTix alloy by nitrogenation processes for 2, 4, 6 and 10 h. The microstructure and crystal lattice parameters of the Sm2Fe17xTixN system were presented in detail. The main phase of all Sm2Fe17xTixN (with x=0, 0.5, 1.0 and 2.0) compounds behave the Th2Zn17-type structure, tiny α-Fe, SmFe2, FeTi, Fe2Ti phases may coexist. Ti dissolves into three different phases: Sm2(Fe,Ti)17, FexTi and α-Fe(Ti). With increasing Ti content, corresponding characteristic peaks of Sm2Fe17xTix shift to lower angles and the increment (△V/V) of unit cell volume for Sm2Fe15Ti2 were increased up to 3.898%. However, the deviation amplitude △2θ for the same sample was nearly not changed with the increasing of 2θ angle from 20°to 70°. For the same Sm2Fe17xTix, corresponding characteristic peaks of Sm2Fe17xTixN also shift to lower angles with the increasing of nitriding time. Furthermore, △2θ for high angles was more negative than that for lower angles. △2θ of samples with high Ti content was more negative than that with low Ti content when nitrogenized for less than 6 h, but △2θ of corresponding peaks for all Sm2Fe17xTixN samples behaved in the same way when nitrogenated for over 6 h. The maximum △2θ deviation value at 2θ=70°was over 2.2°after being nitrogenated for 10 h. The maximum lattice parameters,α=8.82 (A2, c=12:88A,V=868A3, and △V/V=10.19% were obtained, but c/α=1.45 was not changed. The saturation magnetization value of all Sm2Fe17xTixN were limited in the scope of 88-1100 kA/m, so the saturation magnetization was not obviously improved for the Ti substitution for some Fe atoms in this alloy.
Sm2Fe17-xTixN,
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崔春翔, Chunxiang
Materials Letters 59 (2005) 3144-3148,-0001,():
-1年11月30日
Using
Nanoparticles,
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崔春翔, Chunxiang
Superlattices and Microstructures xx (xxxx) xxx-xxx,-0001,():
-1年11月30日
Fine-grained Sm2Fe17Nx compounds are easily prepared after nitridation for 4, 6 and 10 h. The structural, lattice parameters and saturation magnetization of the Sm2Fe17Nx system are presented. The pure Sm2Fe17 parent phase and nitrides all behave like the Th2Zn17-type structure. Little SmFe7 phase and α-Fe phase are coexisting in all Sm2Fe17Nx compounds. No unnitrided phase is found. The deviation △2θ for the same nitrided sample almost decreases linearly with increasing 2θ angles but that for the parent alloy is basically not changed. The lattice parameter a, c and saturation magnetization are initially increased with increasing nitriding time, and when nitrided for 6 h, Sm2Fe17Nx exhibits maximal lattice parameters: a = 8.8277 ± 0.0079 ° A, c = 12.8324 ± 0.0199 ° A, V = 866.02 °A3, and V/V = 9.9% and gives the best saturation magnetization, Ms = 152.14 emu/g. When the Sm2Fe17 parent phase is nitrided over 10 h, the lattice parameters and magnetization of Sm2Fe17Nx are all decreased. The maximal deviation angle of 2θ at 2θ = 70◦ for Sm2Fe17Nx overruns 2◦.
Sm2Fe17Nx,
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