Low-Temperature Fracture Strength of MgB 2 Bulk Processed by Spark Plasma Sintering

A. Murakami (1) , J. Noudem (2, 3) , Z. Guesmi (4) , A. Iwamoto (5)

1 NICT - National Institute of Information and Communications Technology [Tokyo]
2 CRISMAT - Laboratoire de cristallographie et sciences des matériaux
3 LUSAC - Laboratoire Universitaire des Sciences Appliquées de Cherbourg
4 ULCO - Université du Littoral Côte d'Opale
5 NIFS - National Institute for Fusion Science

Mechanical properties of a high packing ratio MgB 2 bulk sample processed by spark plasma sintering (SPS) were evaluated at 77 K through bending tests for specimens cut from the bulk sample. The effects of the packing ratio and temperature on the fracture strength of MgB 2 bulk are discussed. The fracture strength at 77 K of the MgB 2 bulk processed by SPS was higher than that at room temperature. The packing ratio of the MgB 2 bulk processed by SPS was higher than those of other MgB 2 bulks processed by sintering under the ambient pressure and hot isostatic pressing. The fracture strength was improved by increasing the packing ratio. The fracture strength at a very low temperature was estimated from the bending test results at 77 K and room temperature. The fracture strength at 20 K of the MgB 2 bulk processed by SPS was estimated to be around 425 MPa. © 2015 IEEE.

Mots clés: Bulk material; Fracture strength; Mechanical properties; MgB2; Spark plasma sintering; Loading; Plasma temperature; Pressing; Superconducting materials; Hip; Magnetic fields; Temperature; Bending; Fracture; Hot pressing; Magnesium compounds; Plasma materials processing; Sintering; Type II superconductors

Domaines: Chimie; Cristallographie; Chimie théorique et/ou physique; Matériaux

A. Murakami, J. Noudem, Z. Guesmi, A. Iwamoto. Low-Temperature Fracture Strength of MgB 2 Bulk Processed by Spark Plasma Sintering. IEEE Transactions on Applied Superconductivity, 2016, 26 (3), pp.7433961. ⟨10.1109/TASC.2016.2542248⟩. ⟨hal-02184752⟩