Cu/Nb-Ti線材の銅比測定方法

抄録

Based on the proposal of IEC/TC90, we have been standardizing the method for the copper-to-superconductor volume ratio (copper ratio) of Cu/Nb-Ti composite superconductors. There are many methods for measuring copper ratio. As a result of comparison studies for each method, however, it has been confirmed that the weight method is very reliable. Therefore, we investigated various restricting conditions in the weight method such as the weight of test samples, dissolving method, etc. We considered the reduction of scattering in measuring values by the weight method and determined a procedure to confirm the appropriateness of these restricting conditions. Upon completing these steps, a round-robin test (RRT) was carried out by eight organizations participating in this project. We present a commentary on the test method for copper ratio in this paper.