Highly Densified MgB2 Bulks by Reactive Mg Liquid Infiltration

Giovanni Giunchi; Giovanni Ripamonti; Elena Perini; Stefano Ginocchio; Enrico Bassani; Tommaso Cavallin

doi:10.4028/www.scientific.net/AST.47.7

Paper Titles

Committee

Preface

Magnetic Mapping - A Way to Test and Understand Current Flows in Thin and Bulk Superconductors
p.1

Highly Densified MgB₂ Bulks by Reactive Mg Liquid Infiltration
p.7

Progress in the Continuous Depostition of YBCO Coated Conductors by Thermal Co-Evaporation
p.17

High-Pressure High-Temperature Synthesis of Nanostructural Magnesium Diboride for Electromotors and Devices Working at Liquid Hydrogen Temperatures
p.25

High Pressure High Temperature (HPHT) Synthesis and Physical Characterization of Magneto-Superconducting RuSr₂Tb_1.5Ce_0.5Cu₂O₁₀ Ceramic Compound
p.31

Synthesis of YBa₂Cu₃O_7-δ Using Oxalate Precursors and Sol-Gel Method
p.37

Growth of Bi-Pb-Sr-Ca-Cu-O Films by Organic Chemical Spray Pyrolysis Deposition
p.43

HomeAdvances in Science and TechnologyAdvances in Science and Technology Vol. 47Highly Densified MgB2 Bulks by Reactive Mg Liquid...

Highly Densified MgB₂ Bulks by Reactive Mg Liquid Infiltration

Abstract:

The issues in the conventional sintering of the MgB2 superconductors have conducted to the discovery of a new way to densify this material. The new process is an “in situ” method that relies on the reactive liquid infiltration (RLI) of liquid Magnesium into Boron powders packed preform. The RLI process allows to obtain highly dense manufacts without the use of hot pressing apparatus and can be applied to the manufacture of large superconducting pieces. One of the peculiarities of the MgB2 superconductivity, that withstand up to 39 K, is represented by the relative insensitiveness of the supercurrent percolation to the orientation of the grain boundaries. This property allows to use polycrystalline material without loosing superconducting performance, granted that a good connectivity between the crystalline grains must be realized, as the RLI process allows to do. The microstructure of the bulk material obtained by RLI shows a variety of morphologies, according to the kind of the used Boron powders and to the process variables. A detailed analysis of the microstructure of the MgB2 obtained by RLI will be presented, as well as its analytical description and the correlation with the superconducting characteristics.