Формирование ультра- и нанодисперсных структур «ядро-оболочка» Ti_0,8Mo_0,2C_0,5N_0,5 – Ni – Mo в процессе плазмохимического синтеза механической смеси карбонитрида титана с металлическими Ni и Mo

В процессе плазмохимического синтеза механической смеси карбонитрида титана TiC_0,5N_0,5 с металлическими никелем и молибденом в низкотемпературной азотной плазме (4000 – 6000 ⁰С) с учетом переконденсации в турбулентном потоке газообразного азота получены порошковые композиции ультрадисперсного и нанокристаллического диапазона. Рентгенографически установлено, что фазовый состав характеризуется наличием кубических соединений в виде титан-молибденового карбонитрида Ti_0,8Mo_0,2C_0,5N_0,5, металлического Ni и Mo. Методами просвечивающей электронной микроскопии высокого разрешения в нанокристаллической фракции  визуализирована структура «ядро-оболочка», в состав которой входят такие фазы как Ti_1-nMo_nC_xN_y, Ni, NiO, TiO₂, MoC_0,5N_0,5.

Совокупность экспериментальных данных по измерению площади удельной поверхности методом BET и пикноментрической плотности позволили определить расчетные значения средних размеров частиц, которые составили 365 и 56 нм для фракций из циклона и фильтра, соответственно. Средний размер частиц нанокристаллической сроставляющей фракции из циклона, по результатам прямых измерений состави 22 нм.

На основе полученных экспериментальных результатов разработана модель формирования структур «ядро-оболочка» Ti_0.8Mo_0.2C_0.5N_0.5 – Ni – Mo, реализуемая в условиях турбулентного потока газообразного азота сформированного в закалочной камере плазмохимической установки.

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