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
2 CRISMAT - Laboratoire de cristallographie et sciences des matériaux
3 LUSAC - Laboratoire Universitaire des Sciences Appliquées de Cherbourg
4 Université du Littoral Côte d'Opale
5 NIFS - National Institute for Fusion Science
Abstract : 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.
Keywords : Bulk material Fracture strength Mechanical properties MgB2 Spark plasma sintering
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https://hal-normandie-univ.archives-ouvertes.fr/hal-02184752
Contributeur : Université Normandie <>
Soumis le : mardi 16 juillet 2019 - 11:32:21
Dernière modification le : mardi 23 juillet 2019 - 15:44:03

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COMUE-NORMANDIE | ENSICAEN | CNRS | UNICAEN

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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, Institute of Electrical and Electronics Engineers, 2016, 26 (3), pp.7433961. ⟨10.1109/TASC.2016.2542248⟩. ⟨hal-02184752⟩

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