Effect of SiO2 and SiC doping on the powder-in-tube processed MgB2 tapes
Effect of SiO2 and SiC doping on the powder-in-tube processed MgB2 tapes
复制标题
DOI：
10.1088/0953-2048/16/8/317
复制
发表时间：
2003-07
影响因子：
3.6
通讯作者：
A. Matsumoto;H. Kumakura;H. Kitaguchi;H. Hatakeyama
中科院分区：
文献类型：
--
作者：
A. Matsumoto;H. Kumakura;H. Kitaguchi;H. Hatakeyama
研究了SiO_2和SiC纳米粉末掺杂对管内粉末法制备的MgB_2/Fe带材的影响。采用镁或氢氧化镁粉末作为原料的镁源，在600℃下热处理1h，从实际生产工艺的角度来看，这种温度较低、加热时间较短的热处理条件是有利的。氢化镁粉末改善了氮化镁颗粒的结合，防止了氧化。掺入SiC和SiO_2大大提高了用Mg+B粉末制备的带材的临界电流密度(Jc)。然而，只有碳化硅掺杂才能有效地提高MgH_2+B粉末的Jc值。碳化硅掺杂降低了JC的磁场敏感性，而SiO_2掺杂没有改变JC的场依赖关系。在4.2K和12T的磁场下，碳化硅掺杂的带材的输运Jc值约为6500A cm−2，不可逆场从17T增加到23T。
Effect of SiO2 and SiC nano-powder doping was investigated for the powder-in-tube processed MgB2/Fe tapes. Mg or MgH2 powder was used as the Mg source of starting materials, and heat treatment was carried out at 600 °C for 1 h. These heat treatment conditions of lower temperature and shorter heating time are advantageous from the aspect of practical production processes. MgH2 powder improved the connection of MgB2 grains and prevented oxidation of MgB2. SiC and SiO2 doping greatly enhanced the critical current density (JC) values of the tapes prepared with Mg + B powder. However, only the SiC doping was effective in enhancing JC values for MgH2 + B powder. SiC doping decreased magnetic field sensitivity of JC, while SiO2 doping did not change the field dependence of JC. The SiC doped tape showed transport JC value of about 6 500 A cm−2 at 4.2 K and in the magnetic field of 12 T. The irreversibility field increased from 17 T to 23 T by the SiC doping.