GB/T 31522-2015 in English

《GB/T 31522-2015基体与超导体体积比测试 Nb3Sn复合超导线铜与非铜体积比》由TC265（全国超导标准化技术委员会）归口，主管部门为中国科学院。
本标准规定了Cu/Nb3Sn线材铜与非铜体积比的测试方法。
本标准适用于横截面积为0.1mm2~3.0mm2,铜与非铜体积比大于或等于0.1的Nb3Sn复合超导线。本标准对芯丝直径不作要求,但不适用于Sn、Cu-Sn合金、阻隔层材料或是其他非铜部分弥散在铜基体中的超导线材,也不适用于稳定材料分散的超导线材。另外,铜与非铜体积比的测量在Nb3Sn成相热处理前或后均可以进行(参见附录E)。
本标准的Cu/Nb3Sn线材具有圆形或矩形截面的一体化结构。
尽管不确定度有所增加,本标准测试方法对横截面积和铜与非铜体积比超出本标准规定范围的Cu/Nb3Sn线材也适用。
经过适当修正,本标准给出的测试方法可应用于其他复合超导线材。

Scope

This standard specifies the test method for Cu/Nb₃Sn wire copper and non-copper volume ratio. This standard applies to Nb₃Sn composite superconducting wires with a cross-sectional area of 0.1 mm²~3.0 mm² and a volume ratio of copper to non-copper greater than or equal to 0.1. This standard does not require the diameter of the core wire, but it does not apply to superconducting wires in which Sn, Cu-Sn alloys, barrier materials or other non-copper parts are dispersed in a copper matrix, nor is it applicable to superconducting wires in which stable materials are dispersed . In addition, the measurement of the volume ratio of copper to non-copper can be carried out before or after Nb₃Sn phase formation heat treatment (see Appendix E). The Cu/Nb₃Sn wire rod of this standard has an integrated structure with circular or rectangular cross-section. Although the uncertainty is increased, this standard test method is also applicable to Cu/Nb₃Sn wires whose cross-sectional area and copper to non-copper volume ratio exceed the range specified in this standard. With appropriate amendments, the test methods given in this standard can be applied to other composite superconducting wires.