K 93 Kurlov, A. S. Particle Size Effects on the Oxidation of Tungsten Carbide Nanopowders / A. S. Kurlov, A. I. Gusev // Russian Journal of Physical Chemistry A. - 2010. - Vol. 84, № 12. - P2095-2101 : il. - Bibliogr. : p. 2101 (17 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ОКИСЛЕНИЕ -- КАРБИД ВОЛЬФРАМА Аннотация: The oxidation of tungsten carbide (WC) powders with the average particle size 〈D〉 from 20 to 6000 nm was studied by differential thermal and differential thermogravimetric analyses. WC powders are oxidized, irrespective of their dispersity, to higher oxide WO3. The conclusion was drawn that at smaller particle sizes of WC powder, the oxidation rate increases, and the temperature of the peak of the exo effect decreases. The functional dependences of the temperature of the peak and the activation energy of oxidation on the particle size were determined Полный текст |