Titre du document / Document title

WC powders obtained by sol-gel and coprecipitation methods

Auteur(s) / Author(s)

BARAU Alexandra ; CRISAN Maria ; ZAHARESCU Maria ; JITIANU Andrei ; CRISAN Dorel ;

Résumé / Abstract

The main purpose of this work was the study of several methods of synthesis and processing of some nanometric oxides used as precursors for non-oxide powders preparation intended to obtain either dense finite bodies, withcontrolled microstructure, or catalysts. WO³ nanometric monocomponent powders were obtained from alkoxide precursors, tungsten acid and ammonium tungstenate. Complex characterization of oxide powders, made by specific methods (X-ray diffraction, differential thermal analysis and thermogravimetric analysis, IR spectrometry and BET specific surface area) has shown that the powders obtained are amorphous or nanocrystalline and present a high tendency of crystallization with thermal treatment. The reduction process of the obtained oxide powders, in order to obtain the corresponding carbides, was also studied using as reduction agent colloidal carbon introduced in the reaction mixture during the sol-gel process. Preliminary studies of the reduction of the powders were realized in an argon atmosphere with 7% H² at 800°C and 1000°C.

Revue / Journal Title

Revue Roumaine de Chimie   ISSN 0035-3930   CODEN RRCHAX 

Source / Source

2004, vol. 49, n^o3-4, pp. 205-212 [8 page(s) (article)]

Langue / Language

Anglais
Revue : Multilingue

Editeur / Publisher

CARTIMEX, Bucuresti,   (1964) (Revue)

Localisation / Location

INIST-CNRS, Cote INIST : 4610 D, 35400012227626.0050