Precursor synthesis and properties of nanodispersed tungsten carbide and nanocomposites WC:nC / Krasil'nikov Vladimir N.,Polyakov Evgenii V.,Khlebnikov Nikolai A.,Tarakina Nadezda V.,Kuznetsov Mikhail V. // CERAMICS INTERNATIONAL. - 2017. - V. 43, l. 5. - P. 4131-4138.

ISSN/EISSN:

0272-8842 / 1873-3956

Type:

Article

Abstract:

Nanoscale tungsten carbide (WC) and WC:nC nanocomposites have been synthesized by the precursor method. The precursor, obtained in the form of a glassy mass by thermal treatment of a mixture of (NH4)(10)W12O41 center dot 7H(2)O and glycerol, was heated in inert gaseous atmosphere up to 1050-1100 degrees C. The concentration of chemically active carbon in the precursor and nanocomposites depends on the W/C ratio in the initial mixture. At W/C=1/ 3 pure tungsten carbide is formed; at W/C > 1/3 composites of WC and free carbon (WC:nC) are formed. Heating of the precursor with W/C=1/6 up to 1100 degrees C in helium atmosphere results in the formation of carbon encapsulated tungsten carbide nanoparticles. An increase in the precursor-heating rate leads to the formation of chain-like structures. Each chain consists of hexagonal WC grains with unit cell parameters a=2.93 angstrom and c=2.83 angstrom. Free carbon in WC:nC composites forms agglomerates of carbon ``nano-onions{''} of spherical or multi layered tubular shapes.

Author keywords:

Carbon; Composites; Tungsten carbides HIGH-SURFACE-AREA; HYDROGEN EVOLUTION REACTION; RAMAN-SPECTROSCOPY; PLATINUM CATALYST; CARBON NANOTUBES; PHASE; GRAPHITE; POWDER; DEPOSITION; COMPOSITE

DOI:

10.1016/j.ceramint.2016.12.026

Web of Science ID:

ISI:000394073800026

Соавторы в МНС:

Другие поля

Поле	Значение
Month	APR 1
Publisher	ELSEVIER SCI LTD
Address	THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Language	English
EISSN	1873-3956
Keywords-Plus	HIGH-SURFACE-AREA; HYDROGEN EVOLUTION REACTION; RAMAN-SPECTROSCOPY; PLATINUM CATALYST; CARBON NANOTUBES; PHASE; GRAPHITE; POWDER; DEPOSITION; COMPOSITE
Research-Areas	Materials Science
Web-of-Science-Categories	Materials Science, Ceramics
Author-Email	NA.Khlebnikov@urfu.ru
ResearcherID-Numbers	Tarakina, Nadezda/A-7870-2013 Khlebnikov, Nikolai/M-7446-2013 Polyakov, Evgeny/A-7817-2012
ORCID-Numbers	Tarakina, Nadezda/0000-0002-2365-861X
Funding-Acknowledgement	Act 211 Government of the Russian Federation {[}02.A03.21.0006]
Funding-Text	This work was supported by Act 211 Government of the Russian Federation, agreement No. 02.A03.21.0006.
Number-of-Cited-References	44
Usage-Count-Last-180-days	11
Usage-Count-Since-2013	30
Journal-ISO	Ceram. Int.
Doc-Delivery-Number	EK6ZC