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

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.
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Submitted on : Tuesday, July 16, 2019 - 11:32:21 AM
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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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