标准摘要
[中文适用范围]： IEC 61788-27:2025 规定了用解扭法测量 Nb-Ti/Cu 和 Nb-Sn/Cu 复合超导体扭绞节距的试验方法。该试验方法适用于具有整体结构的 Nb-Ti/Cu 和 Nb-Sn/Cu 复合超导导线，这些导线具有直径范围为 0.2 mm 至 2 mm 的圆形横截面或面积与圆形横截面导线相当的矩形横截面。这些导线的细丝直径范围为 6 µm 至 200 µm，扭绞节距在 5 mm 至 50 mm 之间，基体为铜或铜合金。本文件使用硝酸去除基体（铜或铜合金），因此复合超导导线的表面可以镀上可被硝酸溶解的材料。虽然不确定度可能会增加，但当横截面积、丝径和绞合节距等参数超出限值时，该方法可适用于Nb-Ti/Cu或Nb-Sn/Cu复合超导导线。本文件规定的测试方法经适当修改后，有望适用于其他类型的复合超导导线。 [外文原描述]： IEC 61788-27:2025 specifies a test method for the twist pitch measurement of Nb‑Ti/Cu and Nb‑Sn/Cu composite superconductors by an untwisting method. The test method is applicable to Nb‑Ti/Cu and Nb‑Sn/Cu composite superconducting wires with monolithic structures, which have either a round cross section with a diameter ranging from 0,2 mm to 2 mm or a rectangular cross section that is equivalent in area to the round cross‑sectional wires. These wires possess a filament diameter ranging from 6 µm to 200 µm, a twist pitch between 5 mm and 50 mm, and a matrix of copper or copper alloy. This document uses nitric acid to remove the matrix (copper or copper alloy), so the surface of the composite superconducting wire can be plated with a material that is dissolvable by nitric acid. Though uncertainty can increase, the method can apply to Nb‑Ti/Cu or Nb‑Sn/Cu composite superconducting wires when the parameters of cross-sectional area, filament diameter and twist pitch are out of the limit. The test method specified in this document is expected to apply to other types of composite superconducting wires after some appropriate modifications.
英文名称Superconductivity - Part 27: Twist pitch measurement of practical superconducting wires - Twist pitch measurement of Nb‑Ti/Cu and Nb‑Sn/Cu composite superconductors