Experimental research on residual carbon of Y211 inclusions in a melt-textured Y123/Y211 composite

ABSTRACT The inherent doping of residual carbon during the preparation of Y2BaCuO5 (Y211) inclusions would degrade the physical and mechanical performance of the Y1Ba2Cu3O7-x (Y123) superconducting matrix. Y211 precursor powders were prepared by the oxalate coprecipitation process in this study. Residual carbon contents of Y211 powders under different heat treatment processes were studied by the high-frequency combustion infrared absorption method. The residual carbon content of Y211 reached the current best level ∼0.012% when calcined in O2 flow at 950°C for 20 h. Y211 powders with the lowest carbon content were used to prepare a small batch of melt-textured Y123/Y211 composites. All samples were single-domain crystals without macro defects, which were usually caused by the emission of CO2. Among them, one sample (Ø27 mm × 14 mm) has a maximum levitation force of 71 N (77 K, 0.5 T), with critical current density Jc of 3.2 × 108 A/m2 (77 K, 0 T).

[1]  Y. Uzun,et al.  Superconducting Properties of Melt-Textured Growth YBa2Cu3O7−x Materials with Y211 Addition , 2015 .

[2]  Roman Puzniak,et al.  Influence of the Y211 phase on anisotropic transport properties and vortex dynamics of the melt-textured Y123/Y211 composites , 2010 .

[3]  Ferran Espiell,et al.  Synthesizing the Y-123/Y-211 composite by the PVA method , 2002 .

[4]  Ming Qiu,et al.  Analyses and Tests of HTS Bearing For Flywheel Energy System , 2014, IEEE Transactions on Applied Superconductivity.

[5]  N. Enomoto,et al.  Synthesis of Superconductive Oxides by Vacuum Calcination Method , 1988 .

[6]  Yinian Zhu,et al.  Preparation and Properties of Porous Composite of Hematite/Magnetite/Carbon with Eucalyptus Wood Biotemplate , 2015 .

[7]  M. Ohmukai,et al.  The Temperature Dependence of Critical Current in YBa2Cu3O7-d Thin Films Deposited on MgO by an Eclipse PLD , 2001 .

[8]  Wei Zhai,et al.  The Influence of Y-211 Content on the Growth Rate and Y-211 Distribution in Y–Ba–Cu–O Single Grains Fabricated by Top Seeded Melt Growth , 2014 .

[9]  Yijun Feng,et al.  YBCO bulk superconductors prepared by top-seed PMP process , 2003 .

[10]  Ş. Çelik,et al.  Comparative study of critical current density, pinning force and levitation force behavior in Yb211 doped-Sm123 bulk superconductors , 2012 .

[11]  J. L. Chen,et al.  Atomic site occupation determined by magnetism in the Heusler alloy Mn2CoGa doped with Cr , 2014 .

[12]  C. Yeh,et al.  Studies of Ta, Al, and Carbon Sources on Combustion Synthesis of Alumina–Tantalum Carbide Composites , 2015 .

[13]  Xiaoyang Yuan,et al.  Static Characteristics of High-Temperature Superconductor and Hydrodynamic Fluid-Film Compound Bearing for Rocket Engine , 2015, IEEE Transactions on Applied Superconductivity.

[14]  Bo Xiao,et al.  Effect of Traces of CO2 on Arc-Ultrasonic TIG-Welded MGH956 Alloy , 2014 .

[15]  M. Lotfollahi,et al.  Effects of Powder Activated Carbon Particle Size on Activated Carbon Monolith's Properties , 2016 .

[16]  Azwan Iskandar Azmi,et al.  Delamination and Surface Roughness Analyses in Drilling Hybrid Carbon/Glass Composite , 2016 .

[17]  Pavel Diko,et al.  Influence of preparation conditions on 211 particle refinement in YBCO bulk superconductors with Ce addition , 2013 .

[18]  S. Sakka,et al.  The effect of residual carbon on the superconducting properties of YBa_2Cu_3O_7−x powders , 1993 .

[19]  S. Sofie,et al.  Effect of carbon on the microstructure and superconducting properties of YBa2Cu3O7−x melt-textured crystals , 2002 .

[20]  Fei Wang,et al.  Levitation or suspension: Which one is better for the heavy-load HTS maglev transportation , 2015 .

[21]  Key-Xi Xu,et al.  Observations of the influence of Y-211 inclusions on melt textured growth of single domain Y–Ba–Cu–O , 2007 .

[22]  E. S. Reddy.  Microstructural studies of melt-processed Y2BaCuO5 , 2002 .