G 96 Gusev, A. I. Production of nanocrystalline powders by high-energy ball milling: model and experiment [Текст] / A. I. Gusev, A. S. Kurlov // Nanotechnology. - 2008. - Vol. 19, № 26. - С. 265302/1-265302/8. - Библиогр. : с. 265302/8 (8 назв.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): НАНОКРИСТАЛЛИЧЕСКИЕ ПОРОШКИ -- КАРБИД ВОЛЬФРАМА Аннотация: A model of high-energy ball milling of powders has been proposed. It is demonstrated that part of the energy is consumed for initiation of microstrains ε during milling and, hence, the process of the powder grinding is decelerated. An analytical expression has been deduced describing the size of nanocrystalline powder particles as a function of the milling time. The model and the experiment have been compared, using a powder of tungsten carbide (WC). The average size of the particles and the value of the microstrains in the ball-milled powder were determined by an x-ray method from broadening of diffraction reflections. The size of the particles was also evaluated using scanning electron microscopy and the sedimentation method Полный текст |