Effect of SiC nanoparticle addition on the critical current density of MgB2 tapes fabricated from MgH2, B and MgB2 powder mixtures
Effect of SiC nanoparticle addition on the critical current density of MgB2 tapes fabricated from MgH2, B and MgB2 powder mixtures
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添加 SiC 纳米颗粒对 MgH2、B 和 MgB2 粉末混合物制备的 MgB2 带的临界电流密度的影响
DOI：
10.1088/0953-2048/18/10/015
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发表时间：
2005
影响因子：
3.6
通讯作者：
H. Kumakura
中科院分区：
文献类型：
--
作者：
T. Nakane;C. Jiang;T. Mochiku;H. Fujii;T. Kuroda;H. Kumakura
比较了添加纳米碳化硅颗粒对由两种不同起始粉末制备的MgB_2磁带在4.2K和10℃下的临界电流Jc的改善效果。起始粉末是由预混的MgH_2和B(MgH_2+2B)和预混的(MgH_2+2B)和预混的MgB_2(30%的MgB_2)按7：3的比例混合而成的。在纯MgB_2带材中，使用30%的MgB_2作为标准粉末，其Jc值高于由Mg_2O_2+2B制备的带材，但添加10mol%的碳化硅添加剂制备的带材的J_c最高(1.80×104A cm−~2)。由30%的MgB_2制备的带材中含有无硅的MgB_2颗粒的区域，而由MgH_2+2B制备的带材中的Si化合物分布均匀。此外，用30%的MgB_2代替MgH_2+2B可以降低碳化硅添加剂的碳取代效应。这些数据表明，这项增强纯MgB_2带的JC-B特性的技术并不能通过添加纳米级的杂质颗粒来进一步改进。因此，应通过保持(或提高)标准粉末与纳米杂质颗粒之间的整体反应性来改进制备工艺。
The effects of the addition of SiC nanoparticles were compared for MgB2 tapes prepared from two different starting powders with respect to the improvement in the critical current, Jc, at 4.2 K and 10 T. The starting powder was prepared by blending premixed MgH2 and B(MgH2+2B) and premixed (MgH2+2B) and MgB2 (30% MgB2) in a ratio of 7:3. All tapes were fabricated by the in situ powder-in-tube method. The use of 30% MgB2 as standard powder yields higher Jc values than MgH2+2B in the case of the pure MgB2 tape; however, the highest Jc (1.8 × 104 A cm−2) was obtained for the tape from MgH2+2B with 10 mol% SiC additive. The tape from 30% MgB2 contained regions with Si-free MgB2 grains, while Si compounds were distributed homogeneously across the tape prepared from MgH2+2B. Furthermore, the use of 30% MgB2 instead of MgH2+2B was found to reduce the effect of carbon substitution of the SiC additive. These data indicate that the technique, which enhances Jc–B characteristics of the pure MgB2 tape, does not promise further improvement through the addition of nanosized impurity particles. It is concluded that we should improve the fabrication technique of the MgB2 tape by keeping (or improving) the overall reactivity between the standard powder and nanosized impurity particles.
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影响因子：
3.6
作者：
A. Matsumoto;H. Kumakura;H. Kitaguchi;H. Hatakeyama
通讯作者：
A. Matsumoto;H. Kumakura;H. Kitaguchi;H. Hatakeyama
影响因子：
3.6
作者：
S. Ueda;J. Shimoyama;A. Yamamoto;S. Horii;K. Kishio
通讯作者：
S. Ueda;J. Shimoyama;A. Yamamoto;S. Horii;K. Kishio
改进管内粉法高重现性合成高J_c MgB_2块体
DOI：
--
发表时间：
2004
期刊：
Superconductor Science and Technology 17
影响因子：
--
作者：
A.Yamamoto;J.Shimoyama;S.Ueda;Y.Katsura;S.Horii;K.Kishio
通讯作者：
K.Kishio
影响因子：
4
作者：
Dou, SX;Soltanian, S;Tomsic, M
通讯作者：
Tomsic, M