放电等离子烧结制备Mo2BC块体及其性能表征

Synthesis and Performance Characterization of Mo2BC Bulk Prepared by Spark Plasma Sintering

摘要:

通过放电等离子烧结（SPS）制备出了高纯度的Mo₂BC块体。结果表明，经优化后的SPS工艺所制备出的Mo₂BC块体材料结构均匀性极高，维氏硬度达到19 GPa，这归功于Mo₂BC晶体结构内部的强共价键网络。磁学和电学表征证实该材料具有超导性能，超导转变温度为7.8 K，上临界场高达6.3 T。Mo₂BC中优异的力学性能与强超导特性的共存，使其成为极端条件下的理想候选材料。本研究不仅为非中心对称块体材料提供了重要见解，也确立了SPS制备高硬度新型超导体的有效技术路径。

Abstract:

The high-purity Mo₂BC bulk was synthesized via spark plasma sintering (SPS) technique. Results show that the Mo₂BC bulk prepared by optimized SPS process exhibits exceptional structural homogeneity, with a Vickers hardness of 19 GPa. This considerable mechanical hardness is attributed to the strong covalent bonding network within the Mo₂BC crystal structure. Simultaneously, magnetic and electrical characterization confirms that the Mo₂BC bulk has superconductivity with a transition temperature of 7.8 K and a high upper critical field of 6.3 T. The coexistence of such notable mechanical properties and robust superconducting characteristics in Mo₂BC bulk reveals a promising candidate for advanced applications under extreme conditions. This study not only provides crucial insights into the non-centrosymmetric bulk materials, but also establishes SPS as an efficient route for developing novel superconductors with high hardness.