Synthesis and characterization of nano-structured TiB{sub 2} processed by milling assisted SHS route

Journal Article · Thu Nov 15 04:00:00 EST 2012 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2012.08.003· OSTI ID:22163148

Nozari, A.; Heshmati-Manesh, S.

TiB{sub 2} was synthesized via milling assisted self-propagating high-temperature synthesis (SHS) route using TiO{sub 2}, H{sub 3}BO{sub 3} and Mg powders as starting materials. The milling products were compacted and subjected to a hot filament on their top to initiate SHS. Effects of the milling time and addition of NaCl as a process diluent on the phase composition and morphology of the products were investigated. X-ray diffraction analysis indicated the formation of nano-crystalline TiB{sub 2} with mean crystallite size of 31 nm after acid leaching process at room temperature. Addition of 2 mol of NaCl in the same sample decreases the mean crystallite size to 27 nm. SEM and TEM micrographs showed that the mean particle size of TiB{sub 2} decreased from 200 nm in the un-milled sample to about 50 nm in the 5-hour mechanically activated (MA) sample. - Graphical abstract: High purity nano particles of TiB{sub 2} were achieved after complete elimination of undesirable phases by acid leaching of MA-SHS product at ambient temperature. Highlights: Black-Right-Pointing-Pointer Nano-structured pure TiB{sub 2} was synthesized by MA-SHS route. Black-Right-Pointing-Pointer The mean particle size of TiB{sub 2} phase was 50 nm. Black-Right-Pointing-Pointer Impurities were eliminated by leaching of the products at ambient temperature.

• OSTI ID: 22163148
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: Complete Vol. 73; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMBIENT TEMPERATURE
BORIC ACID
IMPURITIES
LEACHING
MILLING
NANOSTRUCTURES
PARTICLE SIZE
PARTICLES
POWDERS
SCANNING ELECTRON MICROSCOPY
SODIUM CHLORIDES
SYNTHESIS
TITANIUM BORIDES
TITANIUM OXIDES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION