超导磁体绝缘用玻璃纤维真空热处理前后性能研究  

Study on the Performance of Glass Fiber Used for Superconducting Magnet Insulation Before and after Vacuum Heat Treatment Process

作　　者：熊秋月 刘志宏[1] 陈文革[3] 闫朝辉 XIONG Qiuyue;LIU Zhihong;CHEN Wenge;YAN Chaohui(Institute of Plasma Physics,Hefei Institute of Material Science,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China;High Magnetic Field Laboratory,Hefei Institute of Physical Science,Chinese Academy of Sciences Hefei 230031,China)

机构地区：[1]中国科学院合肥物质科学研究院等离子体物理研究所,合肥230031 [2]中国科学技术大学,合肥230026 [3]中国科学院合肥物质科学研究院强磁场科学中心,合肥230031

出　　处：《真空科学与技术学报》2021年第8期756-760,共5页Chinese Journal of Vacuum Science and Technology

基　　金：CLCC型Bi系高温超导磁体绝缘工艺关键技术研究(授权号:Y95CTD1192);HS高强玻璃纤维热处理失效机理研究(项目编号:1808085ME110)。

摘　　要：Nb_(3)Sn超导磁体需要长时间640℃真空热处理才能形成超导相,对不同超导磁体绝缘结构使用的国产耐辐照玻璃纤维、HS/6高强玻璃纤维、美国S-2高强玻璃纤维在640℃真空热处理前后分别进行真空压力浸渍(VPI),探究国产玻璃纤维在640℃真空热处理后能否达到美国S-2高强玻璃纤维性能,满足Nb_(3)Sn超导磁体使用要求。测试其在室温下的拉伸、层间剪切强度,直流耐压击穿强度。真空热处理后,三种玻璃纤维增强树脂基复合材料拉伸、层间剪切强度都有大幅下降,HS/6高强玻璃纤维在热处理前后力学性能最好,保留率最高,满足使用要求;但HS/6高强玻璃纤维增强树脂基复合材料的电气强度比S-2高强玻璃纤维增强树脂基复合材料电气强度至少低40%,不能满足使用要求,耐辐照玻璃纤维增强树脂基复合材料丧失绝缘性能。A long time 640℃ vacuum heat treatment is needed for the Nb_(3)Sn superconducting magnet to form the superconducting phase. Vacuum pressure impregnation(VPI)was carried out for the Chinese E glass fiber,HS/6 high-strength glass fiber and American S-2 high-strength glass fiber used in different superconducting magnet insulation structures before and after the vacuum heat treatment process at 640℃. We discuss whether the Chinese glass fiber can reach the performance of American S-2 high-strength glass fiber after the vacuum heat treatment process at 640℃ and meet the requirements of Nb_(3)Sn superconducting magnets. The effect of glass fiber on the mechanical and insulation properties of glass fiber reinforced resin matrix composite(GFRPs)after the vacuum heat treatment process was investigated. The tensile strength,interlayer shear strength,and DC withstand voltage breakdown tests were carried out at RT before and after vacuum heat treatment. After the vacuum heat treatment process,the tensile strength and interlayer shear strength of these GFRPs have been greatly degraded. The HS/6 high-strength glass fiber exhibits the best mechanical properties before and after the vacuum heat treatment process,also has the highest retention rate,and meets the requirements of use. The DC withstand voltage breakdown experiment shows that the electrical strength of HS/6 high-strength GFRP after vacuum heat treatment process is40% lower than that of S-2 high-strength GFRP,which cannot satisfy the requirements for usage,and the E GFRP loses its insulation properties.

关 键 词：Nb_(3)Sn超导磁体绝缘结构 玻璃纤维 玻璃纤维增强环氧树脂基复合材料 真空压力浸渍 

分 类 号：TB332[一般工业技术—材料科学与工程]