Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Synthesis of ZrC and HfC nanoparticles encapsulated in graphitic shells from mechanically milled Zr-C and Hf-C powder mixtures. / Bokhonov, Boris B.; Dudina, Dina V.
в: Ceramics International, Том 43, № 16, 01.11.2017, стр. 14529-14532.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
}
TY - JOUR
T1 - Synthesis of ZrC and HfC nanoparticles encapsulated in graphitic shells from mechanically milled Zr-C and Hf-C powder mixtures
AU - Bokhonov, Boris B.
AU - Dudina, Dina V.
PY - 2017/11/1
Y1 - 2017/11/1
N2 - This work was aimed at evaluating a synthesis route based on the combination of mechanical milling and annealing of metal-carbon powder mixtures for the production of carbon-encapsulated nanoparticles of zirconium and hafnium carbides ZrC and HfC. These structures differ from those previously synthesized via this route by the high melting point and the high enthalpy of formation of the material of the particle core. During high-energy mechanical milling of the metal-amorphous carbon powder mixtures of the Zr-1.2Cam and Hf-1.2Cam compositions, nano-sized particles of carbides were synthesized, and during subsequent annealing of the products of milling at 750 °C in argon, these particles became encapsulated in graphitic shells. The graphitic shells covering the surface of the carbide particles are believed to form through decomposition of supersaturated solid solutions of carbon in the carbides forming during milling as a result of local melting/rapid solidification and generation of defects in the crystalline lattices of the carbides in the solid state under the impacts of the milling balls. This study has shown that nanoparticles of ZrC and HfC encapsulated in graphitic shells can be obtained by a simple and technologically attractive method based on high-energy mechanical milling of carbon-rich Zr-C and Hf-C mixtures.
AB - This work was aimed at evaluating a synthesis route based on the combination of mechanical milling and annealing of metal-carbon powder mixtures for the production of carbon-encapsulated nanoparticles of zirconium and hafnium carbides ZrC and HfC. These structures differ from those previously synthesized via this route by the high melting point and the high enthalpy of formation of the material of the particle core. During high-energy mechanical milling of the metal-amorphous carbon powder mixtures of the Zr-1.2Cam and Hf-1.2Cam compositions, nano-sized particles of carbides were synthesized, and during subsequent annealing of the products of milling at 750 °C in argon, these particles became encapsulated in graphitic shells. The graphitic shells covering the surface of the carbide particles are believed to form through decomposition of supersaturated solid solutions of carbon in the carbides forming during milling as a result of local melting/rapid solidification and generation of defects in the crystalline lattices of the carbides in the solid state under the impacts of the milling balls. This study has shown that nanoparticles of ZrC and HfC encapsulated in graphitic shells can be obtained by a simple and technologically attractive method based on high-energy mechanical milling of carbon-rich Zr-C and Hf-C mixtures.
KW - Carbides
KW - Carbon
KW - Defects
KW - Encapsulated nanoparticles
KW - Milling
KW - CARBON
KW - PARTICLES
KW - CERAMIC COMPOSITES
KW - GRAPHENE
KW - ZIRCONIUM CARBIDE
KW - HAFNIUM
KW - LOW-TEMPERATURE
KW - BORON-NITRIDE
KW - NANOTUBES
UR - http://www.scopus.com/inward/record.url?scp=85026301277&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2017.07.164
DO - 10.1016/j.ceramint.2017.07.164
M3 - Article
AN - SCOPUS:85026301277
VL - 43
SP - 14529
EP - 14532
JO - Ceramics International
JF - Ceramics International
SN - 0272-8842
IS - 16
ER -
ID: 9952501