Monophasic Nanostructured Powders of Niobium, Tantalum, and Hafnium Carbonitrides Synthesized by a Mechanically Induced Self-Propagating Reaction

Niobium, tantalum, and hafnium carbonitride nanopowders were obtained by high‐energy ball milling of elemental metal and graphite in a nitrogen atmosphere. By adjusting milling parameters, a mechanically induced self‐propagating reaction was observed during the formation of carbonitride phases. The...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2007-02, Vol.90 (2), p.381-387
Main Authors: Córdoba, José M., Sayagués, María J., Alcalá, María D., Gotor, F. J.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Ceramics
Chemical industry and chemicals
Chemical synthesis
Cross-disciplinary physics: materials science
rheology
Diffraction
Exact sciences and technology
Materials science
Miscellaneous
Nanoparticles
Nanopowders
Nanoscale materials and structures: fabrication and characterization
Nanostructured materials
Physics
Technical ceramics
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Summary:Niobium, tantalum, and hafnium carbonitride nanopowders were obtained by high‐energy ball milling of elemental metal and graphite in a nitrogen atmosphere. By adjusting milling parameters, a mechanically induced self‐propagating reaction was observed during the formation of carbonitride phases. The stoichiometry of transition metal carbonitrides was controlled by fixing the starting metal‐to‐carbon molar ratio. Ignition of the reactant mixture was determined by the combined effect of nitrogen and carbon, gas, and solid reagents, respectively. The composition and lattice parameters were determined by X‐ray diffraction measurements. Microstructural characterization showed a nanophase structure with a homogeneous chemical composition.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2006.01395.x