B前驱体和P.I.T.的高温热处理。提高MgB2-based导体Jc性能的工艺优化
High temperature heat treatment of B precursor and P.I.T. process optimization to increase Jc performances of MgB2-based conductor
摘要：
在我们以前的工作中报道的有希望的结果使我们认为，B粉的生产在MgB2合成中起着至关重要的作用。本实验室开发了一种新的硼制备方法。这种特殊的工艺是基于镁热反应（钼酸法），增加了一个初始步骤，得到纳米粒度的硼粉。在本文中，我们报告了我们的努力，这些纳米粉末的PIT方法的优化和解决以前突出的问题，如粉末包装的困难和冷加工过程中发生的高摩擦现象。这增加了胶带和电线制造过程中的裂纹，导致其失效。包装问题与我们实验室合成的硼的无定形性质有关，因此采用晶化处理来提高B粉的结晶度。为了防止过度的摩擦现象，我们合成了非化学计量的MgB2，并使用镁作为润滑剂。我们的目标是改善Jc，但也进行了全面的物理化学表征，以分析我们的治疗所带来的改善：除了磁性和传输Jc测量外，该表征还包括X射线衍射，电阻率与温度测量，SEM图像。
英文摘要：
Promising results reported in our previous works led us to think that production of B powder plays a crucial role in MgB2 synthesis. A new method for boron preparation has been developed in our laboratory. This particular process is based on magnesiothermic reaction (Moissan process) with the addition of an initial step that gives boron powder with nano-metric grain size. In this paper we report our efforts regarding optimization of PIT method for these nanometric powders and the resolution of problems previously highlighted such as the difficulty in powder packaging and the high friction phenomena occurring during cold working. This increases cracking during the tape and wire manufacturing leading to its failure. Packaging problems are related to the amorphous nature of boron synthesized in our laboratory, so a crystallization treatment was applied to improve crystallinity of B powder. To prevent excessive friction phenomena we synthesized non-stoichiometric MgB2 and using magnesium as lubricant. Our goal is the Jc improvement, but a global physical-chemical characterization was also made to analyze the improvement given by our treatments: this characterization includes X-ray diffraction, resistivity vs. temperature measurement, SEM image, besides magnetic and transport Jc measurements.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
