报告题目 (Title)：Overview of spark plasma sintering of superconducting MgB2 cryomagnets（放电等离子烧结制备超导二硼化镁低温磁体的研究综述）

报告人 (Speaker)：Jacques Guillaume NOUDEM (University of Caen)

报告时间 (Time)：2026年3月25日（周三）9:30-11:00

报告地点 (Place)：校本部 G213

邀请人 (Inviter)：周迪帆

主办部门：理学院物理系

摘要 (Abstract)：

We report on the spark plasma synthesis, sintering and characterization of bulk MgB2 superconductors prepared according to three processing routes using non-conventional Spark Plasma Sintering (SPS). The density of the obtained bulks was up to 98 % of the theoretical density of the material. The highest critical current densities, Jc, at 20K in self-field, 1, 2 and 4 T were equal to 700 kA/cm2, 570 kA/cm2, 270 kA/cm2 and 30 kA/cm2 respectively, and were obtained with the MgB2 sample processed according to the Mg+2B route. The structural characterization and chemical analysis were carried out as well as the superconducting properties.

In addition, the functional properties of superconducting MgB2 cryo-magnets sintered by SPS were investigated. The trapped fields higher than 4.8 and 3.9 T have been measured at 10 and 20 K respectively in a magnetized stack of two disc-shaped bulk MgB2 superconductors of 20 mm diameter and 10 mm thick. Finally, the feasibility to use the MgB2 in Maglev vehicle has been investigated between 17 to 35 K. The levitation forces up to ~700 N were performed at 20 K on the sample with the diameter up to 120 mm.