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Self‐propagating mechanosynthesis of HfB 2 nanoparticles by a magnesiothermic reaction
Author(s) -
Jalaly Maisam,
Gotor Francisco J.,
Sayagués María J.
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15297
Subject(s) - mechanosynthesis , nanoparticle , hafnium , materials science , boron , chemical engineering , phase (matter) , combustion , magnesium , nanotechnology , metallurgy , chemistry , ball mill , organic chemistry , zirconium , engineering
A mechanically induced self‐sustaining reaction ( MSR ) was used to synthesize hafnium diboride nanoparticles. Along this route, magnesium was selected as a robust reducing agent for co‐reduction in boron and hafnium oxides in a combustive manner. Combustion occurred after a short milling period of 12 minutes. The hafnium diboride nanoparticles had a polygonal faceted morphology and were 50‐250 nm in diameter. The assessment of the processing mechanism revealed that the initial combustive reduction in B 2 O 3 to elemental B by Mg was the major step for progressing the overall reaction. After that, HfO 2 can be reduced to elemental Hf, followed by the synthesis of HfB 2 phase.