Ferrite materials, especially those containing nickel and cobalt, are popular due to their unique mechanical and magnetic properties. Single phase NiFe2O4 and CoFe2O4 nanopowders obtained by different methods were used for sintering studies. Chemical sol-gel self-propagating combustion method, co-precipitation technology combined with hydrothermal synthesis or spray-drying method, and high frequency plasma chemical synthesis have been used to synthesize ferrite nanopowders. Relatively dense (95-99%) materials with high saturation magnetization (MS = 80-84 emu/g for CoFe2O4 and MS = 46-48 emu/g for NiFe2O4) were obtained at 1100-1200 °C temperatures.
The formation of high temperature composites in W-C-B system from fine-grained powders in dependence on the ratio of components by using reactive spark plasma sintering was studied. The mixture of W2C and C nanoparticles was used as tungsten and carbon precursors. The W2C and carbon mixture with different ratio of components was prepared by reduction of WO3 in presence of CH4 in nitrogen inductively coupled plasma. The specific surface area of the mixture was in the range of 36-42 m 2 /g in dependence on the content of carbon. The W2C and carbon particles were mixed mechanically with amorphous boron and densified using the spark plasma sintering technique at 1500-1700 °C and pressure of 30 MPa for 4 minutes. The sintered bodies contained WB2 and B4C phases. The ratio of phase depends on the content of the components in the raw mixture.
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