NDLI: On the factors determining the pyrophoric stability of tungsten nanopowder obtained by plasma-chemical pyrolysis of W(CO)$

Content Provider	Springer Nature Link
Author	Shulga, Yu. M. Martynenko, V. M. Berestenko, V. I. Domashnev, I. A. Kurkin, E. N. Torbov, V. I.
Copyright Year	2011
Abstract	Nonpyrophoric tungsten powders with an average particle size of about 30 nm were obtained by pyrolysis of tungsten hexacarbonyl in a flow of microwave discharge nitrogen plasma. It is found that these powders are stable in air up to 300°C. The reason for such stability is that the structure of powder particles is of the core-double shell type, in which the metal core is covered with an oxide film approximately 1 nm in thickness, coated in turn with roentgenoamorphous layer consisting of carbon, oxygen, and nitrogen atoms. It is also established that the powders under investigation mainly release carbon oxides (CO and CO$_{2}$) and water into the gas phase upon heating in vacuum. Among the molecules present in the gas phase in small concentrations, nitrogen monoxide (NO) and formaldehyde (H$_{2}$CO) are worth mentioning apart from C1–C3 hydrocarbons.
Starting Page	1531
Ending Page	1534
Page Count	4
File Format	PDF
ISSN	10637842
Journal	Technical Physics
Volume Number	56
Issue Number	10
e-ISSN	10906525
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-10-07
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Classical Continuum Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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On the factors determining the pyrophoric stability of tungsten nanopowder obtained by plasma-chemical pyrolysis of W(CO)$_{6}$