Методом электроимпульсного плазменного спекания ( ЭИПС ) образцы получены образцы керамики WC–(1, 3, 5)% ZrO 2 . Порошковые смеси WC–ZrO 2 получали путем ультразвуковой гомогенизации и перемешивания нанопорошков WC и субмикронных порошков t -ZrO 2 . Показано, что интенсивность спекания образцов WC–ZrO 2 лимитируется процессом зернограничной диффузии. Увеличение содержания ZrO 2 приводит к незначительному повышению оптимальной температуры ЭИПС, увеличению количества частиц W 2 C, а также сопровождается снижением твердости.

С использованием технологии электроимпульсного плазменного спекания получены высокоплотные образцы ультрамелкозернистого карбида вольфрама с высокой твердостью (до 31–34 ГПа) и повышенной трещиностойкостью (до 5.2–6.4 МПа · м1/2). Исследовано влияние исходного размера наночастиц -WC, полученных методом плазмохимического синтеза, на плотность, параметры структуры и механические свойства карбида вольфрама.

High-speed consolidation of pure tungsten carbide powders by electropulse plasma sintering («Spark Plasma Sintering») has been carried out. The effect of initial WC nanoparticle size and their production conditions on density, structural parameters, and mechanical properties of tungsten car- bide has been studied. Samples of high-density nano-structural tungsten carbide with high hardness (up to 31 GPa) and crack growth resistance (5,2 MPa ∙ m 1/2 ) are obtained.

The consolidation of nanosized pure tungsten carbide and carbide alloy powders by spark plasma sintering has been studied. Pure WC sintering modes within the temperature interval (1400–1950)C and heating rates from 25 to 2400C/min have been investigated. Nanostructured specimens with a record hardness of 3180 HV and a satisfactory fracture toughness of K1c=4.5–6.5 MPam1/2 have been obtained. The article determines the dependences of density, hardness, and grain structure of WC-8 wt.% Co alloys with TaC/VC inhibitors on the sintering temperature, heating rate and solid-state sintering time. Nanostructured WC-8 wt.% Co specimens with high values of hardness (17–19 GPa) and fracture toughness (more than 10 MPam1/2) have been obtained.

Sintering mechanisms, structure and mechanical properties of nano and superdispersed tungsten pseudoalloys W-Ni-Fe (WNF) and W-Ni-Fe-Co (WNFC) have been investigated. The influence of tungsten particle size on the optimum sintering temperature has been studied. The particle size has been changed by mechanical activation of the original coarse-grained blend and by adding superdispersed particles obtained by sol-gel method and plasmochemical synthesis. Free sintering and spark plasma sintering of nano and superdispersed powders have been used. The dependence of pseudoalloy density on heating temperature has been found to be nonmonotonic with the maximum corresponding to the optimum sintering temperature. It has been shown that an increase in mechanical activation time and the strain rate, accompanied by pseudoalloy particle reduction and formation of nonequilibrium solid solutions, leads to the reduction of the optimum sintering temperature. It has also been shown that using planetary highenergy milling methods and high-rate spark plasma sintering it is possible to create superstrong tungsten alloys whose mechanical properties (macroelastic stress, yield stress) exceed substantially similar properties of commercial alloys.