TY - JOUR

T1 - Combustion characteristics and structure of carbon nanotube/titanium composites

AU - Korchagin, Michail A.

AU - Gabdrashova, Sholpan E.

AU - Dudina, Dina V.

AU - Bokhonov, Boris B.

AU - Bulina, Natalia V.

AU - Kuznetsov, Vladimir L.

AU - Ishchenko, Arcady V.

N1 - Publisher Copyright: © 2019, Akadémiai Kiadó, Budapest, Hungary.

PY - 2019/9/30

Y1 - 2019/9/30

N2 - Reactivity of nanosized objects is a hot topic in modern solid-state chemistry and materials science. The present work is focused on the interaction between multi-walled carbon nanotubes (MWCNTs) and metallic titanium during high-energy ball milling and thermal explosion, a rapid temperature rise in a mixture caused by an exothermic reaction ignited by external heating and occurring throughout the sample volume. A fundamental property of the nanocomposite mixture—the ability of its components to react in the combustion mode—is explained; an analysis of the dependence of the combustion characteristics of the nanocomposites on the milling duration of powder mixtures is provided. The phase and structural transformations of the Ti-MWCNT mixtures have been analyzed using X-ray diffraction and transmission electron microscopy. It was found that the ball-milled powders contain nanostructured titanium, nanotube fragments, amorphous carbon and nanosized carbon-deficient titanium carbide TiC x . Within the nanocomposite powder particles, TiC x nanoparticles are covered with layers of amorphous carbon. Thermal explosion was observed in Ti-4mass%MWCNT mixtures milled for 1.5–7 min. Shorter milling times were apparently not sufficient for establishing a proper interfacial contact, while longer milling times led to the extensive formation of titanium carbide TiC x , which acted as a barrier lowering the heat release by the mixture upon ignition. Both the ignition temperature of Ti-4mass%MWCNT and the maximum temperature developed during thermal explosion decrease with the milling time. A comparison of the behavior of MWCNT with that of carbon black under conditions of thermal explosion in the mixtures with titanium is also presented.

AB - Reactivity of nanosized objects is a hot topic in modern solid-state chemistry and materials science. The present work is focused on the interaction between multi-walled carbon nanotubes (MWCNTs) and metallic titanium during high-energy ball milling and thermal explosion, a rapid temperature rise in a mixture caused by an exothermic reaction ignited by external heating and occurring throughout the sample volume. A fundamental property of the nanocomposite mixture—the ability of its components to react in the combustion mode—is explained; an analysis of the dependence of the combustion characteristics of the nanocomposites on the milling duration of powder mixtures is provided. The phase and structural transformations of the Ti-MWCNT mixtures have been analyzed using X-ray diffraction and transmission electron microscopy. It was found that the ball-milled powders contain nanostructured titanium, nanotube fragments, amorphous carbon and nanosized carbon-deficient titanium carbide TiC x . Within the nanocomposite powder particles, TiC x nanoparticles are covered with layers of amorphous carbon. Thermal explosion was observed in Ti-4mass%MWCNT mixtures milled for 1.5–7 min. Shorter milling times were apparently not sufficient for establishing a proper interfacial contact, while longer milling times led to the extensive formation of titanium carbide TiC x , which acted as a barrier lowering the heat release by the mixture upon ignition. Both the ignition temperature of Ti-4mass%MWCNT and the maximum temperature developed during thermal explosion decrease with the milling time. A comparison of the behavior of MWCNT with that of carbon black under conditions of thermal explosion in the mixtures with titanium is also presented.

KW - Ball milling

KW - Multi-walled carbon nanotubes

KW - Thermal explosion

KW - Titanium

KW - Titanium carbide

KW - THERMAL-EXPLOSION

KW - BEHAVIOR

KW - NANOTUBES

KW - TITANIUM

KW - MECHANICAL-PROPERTIES

KW - HIGH-TEMPERATURE SYNTHESIS

UR - http://www.scopus.com/inward/record.url?scp=85062726343&partnerID=8YFLogxK

U2 - 10.1007/s10973-019-08109-8

DO - 10.1007/s10973-019-08109-8

M3 - Article

AN - SCOPUS:85062726343

VL - 137

SP - 1903

EP - 1910

JO - Journal of Thermal Analysis and Calorimetry

JF - Journal of Thermal Analysis and Calorimetry

SN - 1388-6150

IS - 6

ER -