Fabrication of SPS compacts from NbC-NbB2 powder mixtures synthesized by the MA-SHS in air process

When the powder mixture of Nb/B/C = 2/2/1 in molar ratio was mechanically activated (MA) by ball milling for 105 min and then exposed to air, it self-ignited spontaneously and the self-propagating high-temperature synthesis (SHS) was induced. The powder mixture of NbC and NbB2 was obtained by this M...

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Bibliographic Details
Published in:Journal of alloys and compounds 2006-05, Vol.415 (1-2), p.156-161
Main Authors: TSUCHIDA, Takeshi, KAKUTA, Tsuyoshi
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Materials synthesis
materials processing
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Physics
Tribology and hardness
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Summary:When the powder mixture of Nb/B/C = 2/2/1 in molar ratio was mechanically activated (MA) by ball milling for 105 min and then exposed to air, it self-ignited spontaneously and the self-propagating high-temperature synthesis (SHS) was induced. The powder mixture of NbC and NbB2 was obtained by this MA-SHS in air process and then sintered by spark plasma sintering (SPS) at a temperature as low as 1800 deg C. The sintered NbC/NbB2 composite compact showed the fine, homogeneous microstructure consisting of the a few |xm-sized grains and the Vickers hardness of 19.8 GPa, which was higher than 14.3 and 16.6 GPa for the NbC/NbB2 composite compacts sintered from the powder mixture of Nb/B/C = 2/2/1 without MA-SHS and from the commercial powder mixture of NbC/NbB2 = 1/1.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2005.08.012