Reaction spark plasma sintering of niobium diboride

K. Sairam, J.K. Sonber, T.S.R.Ch Murthy, C. Subramanian, R.K. Fotedar, R.C. Hubli

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26 Citations (Scopus)


Niobium diboride (NbB2) is synthesized and consolidated by the spark plasma sintering technique. Elemental reactants such as niobium (Nb) and boron (B) were subjected to two stage heat treatment, initially at 1200 °C for synthesis and followed by densification at the temperatures in the range of 1700 °C to 1900 °C. High dense NbB2 (~ 97.7%ρth) is obtained at 1900 °C after 15 min holding period. Load application during heat treatment stage is found to improve the sinterability of the niobium diboride compacts. Hardness, elastic modulus and indentation fracture toughness of the high dense NbB2 are measured as 20.25 GPa, 539 GPa and 4 MPa m1/2 respectively.
Original languageEnglish
Pages (from-to)259-262
Number of pages4
JournalInternational Journal of Refractory Metals and Hard Materials
Early online date29 Dec 2013
Publication statusPublished - Mar 2014


  • Niobium diboride
  • Spark plasma sintering
  • Reaction sintering
  • Joules heating
  • Mechanical properties
  • Microstructure


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