金属Ag掺杂MgB_2超导体的低温活化烧结  

LOW TEMPERATURE ACTIVATED SINTERING OF MGB_2 SUPERCONDUCTOR WITH AG DOPING

作　　者：姜海[1] 刘永长[1] 马宗青[1] 霍洁[1] 董治中[1] 余黎明[1] 

机构地区：[1]天津大学材料科学与工程学院,天津300072

出　　处：《低温物理学报》2010年第1期43-46,共4页Low Temperature Physical Letters

基　　金：国家自然科学基金(批准号:50401003);教育部新世纪优秀人才资助计划(批准号:NCET-05-0250)资助的课题~~

摘　　要：较之高温制备,低温活化烧结技术可有效避免MgB2超导块体制备中的一些问题,如Mg易挥发、高温MgB2晶粒长大、结晶度高等问题.为进一步提高超导块体的载流能力,J Shimoyama等采用金属Ag掺杂并在550℃烧结72h后获得了高性能的MgB2超导体,使得金属Ag成为低温活化烧结的有效组元.然而,对金属Ag低温活化烧结MgB2超导块体的成相机理尚缺乏系统的分析和理解.本文系统研究了金属Ag掺杂MgB2超导块体的成相动力学过程,发展了金属Ag掺杂低温活化快速制备技术,结合液相活化烧结理论阐述了金属Ag掺杂MgB2块体的低温活化烧结机理.Comparing with high-temperature sintering, low-temperature sintering could avoid some prootems in fabrication of MgB2 superconductor, such as volatility of Mg, growth of MgB2 grain, high crystallinity etc. In order to improve the critical current density of MgB2 superconductor, Shimoyama et al. obtained high performance MgB2 by sintering at 550℃ for 72h, which indicated that Ag could activate the sintering process. However, the sintering mechanism of MgB2 with Ag addition is still unknown. In the present paper, we have investigated this mechanism according to liquid activated mechanism and provide the selection rules of these metals which could activate the sintering process of MgB2 at low temperature.

关 键 词：MGB2超导体 AG 低温活化烧结 

分 类 号：O511[理学—低温物理]