Fabrication and Properties of Cu/MgB₂ Composites by Vacuum Sintering

Abstract:

Cu/MgB₂ composites with different content of MgB₂ (10, 20, 30 vol.%) were fabricated by vacuum sintering of copper and MgB₂ powders. The effects of MgB₂ content and sintering process on the properties of Cu/MgB₂ composites including the microstructures, relative density, electrical conductivity and hardness were then investigated. The results showed that the distribution uniformity of MgB₂ on copper matrix decreased obviously with the increase of MgB₂ content, the hardness of Cu/MgB₂ composites increased and the relative density decreased slightly though the electrical conductivity decreased greatly. The relative density and hardness of Cu/MgB₂ composites increased after the repressing-resintering process, the electrical conductivity was also improved slightly.

• Periodical: Materials Science Forum (Volume 749)
• Pages: 141-144
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.749.141
• Online since: March 2013
• Authors: Qing Yang, Jun Tao Zou, Zhao Liu, Xiao Jiang Yu
• Keywords: Cu/MgB₂ Composite, Property, Repressing-Resintering, Vacuum Sintering

References

[1] J. Nagamasu, N. Nakagawa, T. Muranaka, Y. Zenitany, J. Akimitsu, Superconductivity at 39 K in magnesium diboride, Nature 410 (2001) 63-64.

DOI: 10.1038/35065039

[2] P.C. Canfield, S.L. Bud'ko, D.K. Finnemore, An overview of the basic physical properties of MgB2, Physica C 385 (2003) 1-7.

[3] M.A. Aksan, A. Guldeste, Y. Balci, M.E. Yakinci, Degradation of superconducting properties in MgB2 by Cu addition, Solid State Commun. 137 (2006) 320-325.

DOI: 10.1016/j.ssc.2005.11.040

[4] Z.Q. Ma, Y.C. Liu, Q.Z. Shi, Q. Zhao, Z.M. Gao, The accelerated formation of MgB2 bulks with high critical current density by low-temperature Cu-doping sintering, Supercond. Sci. Technol. 21 (2008) 065004 (7pp).

DOI: 10.1088/0953-2048/21/6/065004

[5] Y. Tang, X. Kong, J. Zang, The superconducting properties of Cu-doped MgB2 bulks prepared by a high-energy milling method, Physica C 469 (2009) 1902-(1905).

DOI: 10.1016/j.physc.2009.06.004

[6] P.C. Canfield, D.K. Finnemore, S.L. Bud'ko, J.E. Ostenson, G. Lapertot, C.E. Cunningham, C. Petrovic, Superconductivity in dense MgB2 wires, Phys. Rev. Lett. 86 (2001) 2423-2426.

DOI: 10.1103/physrevlett.86.2423

[7] W. Goldacker, S.I. Schlachter, S. Zimmer, H. Reiner, High transport currents in mechanically reinforced MgB2 wires, Supercond. Sci. Technol. 14 (2001) 787-793.

DOI: 10.1088/0953-2048/14/9/331

[8] D.B. Liu, M.F. Chen, A. Rauf, C.X. Cui, J.J. Tan, Preparation and characterization of copper matrix composites by reaction sintering of the Cu-Mg-B system, J. Alloys Compd. 466 (2008) 87-91.

DOI: 10.1016/j.jallcom.2007.11.022

[9] J.A. Dean, Lange's Handbook of Chemistry, 13th ed., McGraw-Hill, New York, (1985).

[10] O. Kubaschewski, C.B. Alcock, International Series on Materials Science and Technology: Metallurgical Thermo-Chemistry, 5th ed., Pergamon Press, Oxford, (1979).