Particle size of vanadium and chromium borides and carbides in a plasma flux

Synthesis of Vanadium Diboride Nanoparticles via Reaction of VCl3 with NaBH4

“…The purpose of this work is to examine the feasibility of preparing VB 2 nanoparticles via solid-state reaction of VCl 3 with NaBH 4 in the temperature range 420-930°C. THEORETICAL ANALYSIS VB 2 can be prepared by the following methods: direct elemental synthesis (high-temperature sintering), borothermal reduction of various vanadium oxides and salts, carbothermal reduction of vanadium and boron oxides, mechanochemical synthesis, and plasma synthesis [8][9][10][11][12][13][14][15][16][17][18][19][20].…”

“…VB 2 nanoparticles ~10 nm in size can be prepared by reacting VCl 3 with NaBH 4 in a eutectic mixture of anhydrous lithium and sodium chlorides in a quartz reactor at a temperature of 900°C [16]. Nozdrin et al [17] reported the plasma synthesis of vanadium diboride with a particle size in the range 46-60 nm at temperatures from 1700 to 2300°C in a low-temperature nitrogen plasma flow using a mixture of vanadium oxide and amorphous boron. Using highenergy disintegration, one can obtain fine powders of various compounds, including VB 2 [18].…”

A New the Chnology for Producing Carbide Alloys With Gradient Structure

“…In this regard one of the promising trends in the development of carbide alloys is inventing technologies which provide higher wear resistance without reducing viscosity. Possible ways of development in this sphere are modifying carbide alloy surface with carbides, borides and the like, as well as treatment of the surface with concentrated energy flows [1][2][3][4][5][6]. In Russia WC-Co carbide alloy plates with TiC and TiN ion-plasma coating are produced.…”