Coagulation of tungsten nanopowders under annealing in hydrogen

Coagulation of tungsten nanoparticles is investigated under annealing in hydrogen flow at 600–1000°C and duration of holding up to 1 h. It is established that the main mechanism of coagulation is the gasphase transport, and mass carriers are the WO 3 · H 2 O molecules. Evaluative calculations of the...

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Bibliographic Details
Published in:Russian journal of non-ferrous metals 2008-08, Vol.49 (4), p.314-318
Main Authors: Blagoveshchenskii, Yu. V., Levinskii, Yu. V., Vold’man, G. M.
Format: Article
Language:English
Subjects:
Annealing
Chemistry and Materials Science
Coagulation
Materials Science
Metallic Materials
Nanocomposites
Nanomaterials
Nanostructure
Nanostructured Materials and Functional Coatings
Nonferrous metals
Studies
Tungsten
Tungsten oxides
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Summary:Coagulation of tungsten nanoparticles is investigated under annealing in hydrogen flow at 600–1000°C and duration of holding up to 1 h. It is established that the main mechanism of coagulation is the gasphase transport, and mass carriers are the WO 3 · H 2 O molecules. Evaluative calculations of the coagulation rate are performed and their satisfactory agreement with experimental results is shown. Recommendations for optimization of conditions of thermal treatment of tungsten nanopowders are given.
ISSN:1067-8212
1934-970X
DOI:10.3103/S1067821208040196