Effects of heat treatment and doping with Zr on the superconducting critical current densities of multifilamentary Nb3Sn wires
Effects of heat treatment and doping with Zr on the superconducting critical current densities of multifilamentary Nb3Sn wires
复制标题
热处理和Zr掺杂对多丝Nb3Sn线材超导临界电流密度的影响
DOI：
10.1063/1.1663911
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发表时间：
1974
期刊：
影响因子：
--
通讯作者：
W. Sampson
中科院分区：
文献类型：
--
作者：
M. Suenaga;T. Luhman;W. Sampson
通过对嵌入Cu-10wt%Sn基体中的19-Nb、Nb-0.5wt%Zr、Nb-0.75wt%Zr和Nb-2.5wt%Zr细丝的复合丝进行热处理，制成了由正常金属基体中的19-Nb 3Sn细丝组成的各种丝材样品。Nb-0.75重量% Zr棒含有沉淀物ZrO 2，而剩余Nb棒中的Zr处于固溶体中。复合材料的整体尺寸为2.5×10−2 cm，每根细丝的直径约为2.5×10−3 cm。在40和100 kG下测量了各种热处理在4.2 °K下的临界电流密度Jc。有人发现，临界电流密度是一个很强的函数的Nb 3Sn层的厚度在热处理过程中形成的。Jc对厚度d的依赖性可以近似地用表达式Jc（d）<$J0 exp（-nd）表示，其中J 0是外推的零厚度临界电流密度。在40 kG下，纯Nb形成的Nb 3Sn的J 0约为2.4×106 A/cm 2，固溶体掺杂的Nb的J 0约为1.2×106 A/cm 2。
Various wire samples consisting of 19‐Nb3Sn filaments in a normal metal matrix were made by heat treating composite wires of 19‐Nb, Nb‐0.5 wt% Zr, Nb‐0.75 wt% Zr, and Nb‐2.5 wt% Zr filaments embedded in a Cu‐10 wt% Sn matrix. The Nb‐0.75 wt% Zr rod contained the precipitate ZrO2, while the Zr in the remaining Nb rods was in solid solution. The over‐all size of the composite was 2.5×10−2 cm and each filament was approximately 2.5×10−3 cm in diameter. The critical current density Jc at 4.2 °K was measured at 40 and 100 kG for a variety of heat treatments. It was found that the critical current density was a strong function of the thickness of the Nb3Sn layers formed during heat treatment. This dependence of Jc on the thickness d could be approximately represented by the expression Jc(d)≃J0 exp (−nd), where J0 is the extrapolated zero thickness critical current density. J0 was found to be approximately 2.4×106 A/cm2 at 40 kG for the Nb3Sn formed from pure Nb, 1.2×106 A/cm2 for Nb doped with solid‐solution ad...