Thermomechanical Behavior of Bulk Ni/MWNT Composites Produced via Powder Metallurgy

Authors


  • All authors wish to thank the EU (IRSES project “NanoCom Network”. Pr. No: 247524) for the financial support for the scientist's mobility. The authors thank the EFRE Funds of the European Commission for support of activities within the AME-Lab project. S.S.V. wants to acknowledge German Academic Exchange Service (DAAD) for financially supporting this research.

Abstract

The thermal expansion behavior of Ni matrix composites reinforced with multiwalled carbon nanotubes (MWNT) fabricated by pressureless sintering and hot uniaxial pressing was studied in the range between 50 and 1050 °C and compared to that of pure Ni. The results show an active interaction between the MWNT and the Ni matrix by reducing the coefficient of thermal expansion (CTE) of pure Ni up to 76% between 50 and 400 °C. This reduction is due to the strong interfacial interaction between the matrix and the reinforcement and the low intrinsic CTE of the nanotubes. This outstanding behavior may be very useful in applications were low CTE is required as for example structural materials.

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