摘要
研究了内扩散法Nb3Sn多芯线材随温度和磁场变化的磁化曲线及磁化率，绘出了磁化量-磁场-温度（M－H－T）的三维临界曲面，归一化后的磁化曲线基本符合Kramer拟和方程。计算得到的Nb3Sn多芯线材有效直径比芯线的原始几何尺寸要大，其原因在于微观结构中存在着“桥梁”，分析表明，多余的磁滞损耗来自于“桥梁”。交流磁化率X′和X″在给定频率和背景磁场下，随交流振幅的变化很小，在给定交流振幅下，随交流频率的变化而变化，其受到的耦合主要来自于“桥梁”而不是近程效应的耦合。
Magnetization (M) and susceptibility versus temperature (T) and magnetic field (H) of an internal-Sn processed Nb,Sn wire have been studied and the critical M-H-T surface has been plotted. The normalized magnetization vs. applied field has been filled to Kramer's equation. The effective filament diameter is estimated to be larger than the original filament size. Bridging between the filaments is account for the extra hysteresis. The values of X' and X' do not change much with AC amplitude in a certain background field and frequency, but do change with frequencies for a given AC amplitudes. The interfilament coupling is mainly from bridging, not from proximity effect.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
1998年第6期363-366,共4页
Rare Metal Materials and Engineering
