机构地区: 清华大学理学院应用超导研究中心
出 处: 《低温物理学报》 2003年第A01期197-201,共5页
摘 要: 采用PIT法制备银包套Bi 2 2 2 3多芯超导薄带 ,研究了不同厚度带材的制备工艺和性能特点 .采用不同的轧制变形量 ,将Bi 2 2 2 3/Ag多芯线轧制为 0 .4mm~ 0 .0 7mm不同厚度的带材 .试验结果表明 ,厚度越薄的带材热处理温度较低 ,相变速度更快 .由于组织均匀性和超导相的相对含量及织构的影响 ,不同厚度带材的临界电流密度有很大差异 ,厚度为 0 .1mm左右带材的临界电流密度最高 ,用这样的薄带可以绕制内径更小的线圈 . Using the Power-In-Tube(PIT) process, we have researched the fabrication and properties of Ag sheathed Bi-2223 tapes with different thickness. The tapes of the thickness from 0.4mm to 0.07mm were rolled by different rolling deformation. Experimental results indicate that the heat treatment temperature of thin tapes is a little lower than the common tapes, and their phase transformation speed is quicker. Because of the influence of the homogeneity of the structure and the relative content and the texture of Bi-2223 phase, the critical currents vary with the thickness of the tapes. The critical current is the most when the thickness of the tapes is around 0.1mm, and they can be used for making smaller coils.