Monofilament Wire Silver Sheathed Bi,Pb-Sr-Ca-Cu-O Prepared by Four-Pass Rolling and Repeated Heating Process

5th International Conference on Advanced Materials Sciences and Technology

Hendrik^1 ; Sebleku, P.^1 ; Herbirowo, S.^1 ; Yudanto, S.D.^1 ; Siswayanti, B.^1 ; Lusiana^1 ; Nugraha, H.^1 ; Imaduddin, A.^1 ; Pramono, A.W.^1

Research Center for Metallurgy and Materials, Indonesian Institute of Sciences (P2MM-LIPI), Kawasan Puspiptek, Serpong, Tangerang

15314, Indonesia^1

关键词: Constituent elements;    Critical effects;    Critical temperatures;    Deformation process;    Monofillament and PIT method;    Powder-in-tube method;    Resistivity measurement;    Superconducting phase;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/367/1/012053/pdf
DOI  :  10.1088/1757-899X/367/1/012053

来源: IOP

【 摘 要 】

A four-step process was proposed to manufacture monofilament wire Bi,Pb-Sr-Ca-Cu-O using silver (Ag) sheath fabricated by Powder-In-Tube (PIT) method in which the thickness of wire were subjected to rolling from 10 mm Ø to2 mm Ø and heated at temperature of 860 °C in 24 h. The effect of the rolling and heating process on the properties of four samples Ag-sheathed Bi,Pb-Sr-Ca-Cu-O wires in each step were studied. In x-ray diffraction (XRD) patterns of monofilament wire fabricated by PIT method in which the repeated heating process involved in rolling can alter the precursor phase. At a first and second deformation process, samples sintered at 860 °C in 24 h still contained the constituent elements of precursor powders. Third deformation step were shown to have superconducting phase Bi,Pb-Sr-Ca-Cu-O 2212. According to resistivity measurement analysis, rolling and repeated heating process were shown to have a critical effect on superconductivity. First, second and fourth rolling were found to have no superconductivity, while third rolling were found to exhibit superconductivity of which its value of critical temperature monofilament wire (Tc,onset) was 90 K. Furthermore, according to Scanning Electron Microscopy (SEM) analysis, the rolling and repeated heating process were observed to have important effect on morphology of samples. Wire superconductors on first and second rolling were shown to have crack and high porosity, but after third rolling the crack and porosity were diminished. Overall the deformation process have yielded promising results particularly when the superconducting phase Bi,Pb-Sr-Ca-Cu-O 2212 were found optimum in third deformation process.