Synthesis of niobium nitride in conditions of heat explosion of aluminum nanopowder and niobium pentoxide mixtures

Alexandra O. Chudinova, Alexander P. Ilyin, Lyudmila O. Root, Andrey V. Mostovshchikov, Ekaterina A. Bespalova, Atulya Manuraj

Research output: Contribution to journalArticlepeer-review

Abstract

The relevance. The preparation of refractory nitrides in the air under the conditions of thermal explosion of aluminum nanopowder mixtures with metal oxides presents practical interest both for materials science and for the theory of the reactivity of air at high temperatures. This synthesis is the least energy-intensive, and it does not require complicated equipment. Only the heating of the initial charge is necessary for synthesis, then the process proceeds spontaneously. The main aim of the research is to determine experimentally the composition of combustion products of aluminum nanopowder mixtures with niobium pentaoxide in the air, to substantiate theoretically the stabilization of niobium nitride Nb2N in the air. Object: powder containing niobium nitride obtained by burning a mixture of aluminum nanopowder with niobium pentoxide in the air. Methods: x-ray analysis (diffractometer Difrey-401), differential thermal analysis SDT Q600 Instrument company. On the basis of the results of the differential thermal analysis the authors have calculated four parameters of the mixtures activity: temperature of oxidation beginning (tst.ox., °C), oxidation degree (α, %), maximal oxidation speed (vmax, mg-min), specific thermal effect (ΔH, J-g). X-ray analysis was used for investigating crystal structure of oxidation ending products. Results. Combustion of mixtures of aluminum nanopowder with niobium pentaoxide in the air proceeded in two stages with formation of niobium nitride Nb2N. According to the x-ray analysis in the combustion products, the mixture of NP Al:Nb2O5=3:1 reached maximum of 47 rel. %. The calculation of the isobaric/isothermal potential showed that niobium nitride should be oxidized by air oxygen. The reason of stabilization of Nb2N crystalline phase is the air oxygen deactivation by emission of burning aluminum nanopowder.

Original languageEnglish
Pages (from-to)97-102
Number of pages6
JournalBulletin of the Tomsk Polytechnic University, Geo Assets Engineering
Volume329
Issue number11
DOIs
Publication statusPublished - 2018

Keywords

  • Air nitrogen
  • Aluminum
  • Aluminum nitride
  • Differential thermal analysis
  • Nanopowder
  • Niobium nitride
  • Parameters of activity
  • Thermal explosion
  • X-ray analysis

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Fuel Technology
  • Geotechnical Engineering and Engineering Geology
  • Waste Management and Disposal
  • Economic Geology
  • Management, Monitoring, Policy and Law

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