Artificial pinning-centre (APC) niobium-titaniumcomposites attain critical current density J_C values higher than4000 A mm~-2 at 5 T, 4.2 K, surpassing the barrier reached by theconventional Nb-Ti composite process. At 2 T APC compositesachieve more than double the J_C of conventional composites,making them particularly well suited for low-field applications.On the other hand, APC composites are inferior to conventionalcomposites at 8 T, due to weak high-field pinning and reducedupper critical field. This review discusses fabrication techniques,microstructural development and superconducting and flux-pinning properties of APC composites. Key elements andunderlying issues for achieving higher J_C are identified anddiscussed in terms of the current state of the art.
展开▼
机译：人工钉合中心（APC）铌钛复合材料在5 T，4.2 K时达到的临界电流密度J_C值高于4000 A mm〜-2，超过了常规Nb-Ti复合工艺所达到的壁垒。在2 T时，APC复合材料的J_C达到传统复合材料的两倍以上，使其特别适合于低场应用;另一方面，由于APC复合材料的弱高场钉扎和降低的上临界值，因此在8 T时其性能不如传统复合材料。领域。这篇综述讨论了APC复合材料的制造技术，微结构发展以及超导和助焊剂固定特性。根据当前技术水平，确定并讨论了实现更高J_C的关键要素和潜在问题。
展开▼
