摘要
采用高真空电子束炉不少于3次熔炼的方式制备了大规格高纯铌铸锭。高纯铌铸锭的纯度达到99.99%,剩余电阻率比值(residual resistivity ratio,RRR)稳定地大于300,满足了射频超导腔用高纯铌材料的要求。高纯铌铸锭的RRR值主要受H、N、O、C等间隙元素的影响,随着熔炼次数的增加,气体元素可有效去除,RRR值也稳步增长。高纯铌化学元素的检测精度不能完全与RRR值对应,应结合两参数来评价高纯铌铸锭的品质。
The high purity niobium ingot for RF superconducting cavities was prepared by electron beam melting of more than three times under high vacuum. The obtained high pure niobium ingots have a purity more than 99.99% and an RRR value more than 300. The purity of the niobium ingots has reached the standard specifications of RF superconducting cavities. The RRR value of high purity niobium ingot is mainly affected by interstitial impurities such as H, N, O, and C. With increasing the times of electron beam melting, the interstitial impurities can be removed effectively, and the RRR values increase steadily. RRR value and impurity content should be combined to evaluate the quality of high purity niobium, since the impurity content alone is insufficient.
作者
任军帅
张英明
郭学鹏
席恩平
王娟
Ren Junshuai;Zhang Yingming;Guo Xuepeng;Xi Enping;Wang Juan(Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2019年第2期688-692,共5页
Rare Metal Materials and Engineering
关键词
高纯铌
RRR值
电子束熔炼
high purity niobium
RRR value
electron beam melting
