离心铸造法制备Bi系超导圆筒  

Preparation of Bi-2212 Superconductive Tube by Centrifugul Casting Method

作　　者：王文虎[1] 胡小华[1] 郑萍[1] 周玉琴 陈兆甲[1] 樊占国[2] 单玉桥[2] 

机构地区：[1]中国科学院低温技术实验中心极低温物理实验室 [2]东北大学有色金属系

出　　处：《低温与超导》1999年第1期28-31,共4页Cryogenics and Superconductivity

摘　　要：】采用冶金加工技术，用离心浇铸法制备了Ｂｉ－２２１２相超导圆筒。该方法克服了固相反应法混合不均匀，反应不完整，样品重现性差和Ｔｃ较低的缺点；详细地研究了离心浇铸法的各项工艺参数（石墨模具、不锈钢模具的选择及其预热温度Ｔ、模具转速ｎ、物料熔化温度Ｔ），这种方法可以浇铸出任意尺寸的超导圆筒（Φ４５×４０～Φ６０×５０ｍｍ）。离心浇铸法的关键是确定铸型的转速（ｎ≥１０００ｒ．ｍｉｎ－１）、熔体熔化的温度（１０００℃～１１００℃）及其保温的时间（２０ｍｉｎ左右）和原料中粘结剂的选择，使按不同名义配比的物料（Ｂｉ∶Ｓｒ∶Ｃａ∶Ｃｕ＝２∶２∶１∶２；４∶３∶３∶４；１∶１∶１∶２）均能浇铸出结构致密、表面光滑、机械性能好的圆筒。在原料中加入适量的ＳｒＳＯ４。Bi-2212 superconductive tubes are prepared by centrifugal casting method according to the metallurgical procession technology. It has overcome the shortcomings of inhomogeneous composition, incomplete reaction, low reappearance rate and Tc, which has be caused by the solid reaction method. The corresponding technological parameters of the centrifugal casting method(including the selection for the graphite mould, stainless steel mould, preheating temperature, rotating rate of the mould n, stuff melting temperature T) have been thoroughly studied. The arbitrary dimension superconductive hollow cylinder (45×40mm～60×50mm) can be made according to this method. The key point is to determine the rotating rate of the mould (n≥1000r.min -1 ); melting temperature (1000℃～1100℃); preserving time and viscose in the material. We can obtain glossy surface hollow cylinder with dense structure and good mechanical properties by choosing different nominal prescription of Bi∶Sr∶Ca∶Cu=2∶2∶1∶2;4∶3∶3∶4;1∶1∶1∶2.

关 键 词：离心铸造 超导圆筒 BI-2212 BSCC 

分 类 号：TM262.05[一般工业技术—材料科学与工程]