Aluminothermic Reduction of K₂TiF₆to Prepare TiC, TiB₂, and TiN Nanoparticles

Abstract

Aluminothermic reduction of K 2 TiF 6 in the presence of C, B, or N 2 was investigated as a low exothermic combustion process for synthesizing nanoparticles of titanium ceramics such as TiC, TiB 2 , and TiN. Sample pellets were prepared by mixing powders of K 2 TiF 6 , Al, and non-metal (C, B) powders in stoichiometric ratios. Experiments were conducted at room temperature under either an Ar or N 2 atmosphere. The combustion parameters were estimated from the temperature-time profiles, measured in the combustion wave using thermocouples. The reaction drastically proceeds within seconds, raising the temperature to 890-1170 C. The size of TiC, TiB 2 , and TiN nanoparticles prepared by the developed approach were, respectively, 5-30 nm, 10-60 nm, and 70-100 nm.

Production of nanocrystalline TiB2powder through self-propagating high temperature synthesis (SHS) of TiO2–H3BO3–Mg mixture

“…6 The TiB 2 powder is synthesised by different methods such as carbothermic reduction of TiO 2 and B 2 O 3 mixture, gas phase Na/TiCl 4 /BCl 3 flame reaction, direct reaction of Ti, its oxide and its hydrides with elemental boron, reaction of NaBH 4 and TiCl 4 , reactions of elemental powders, solution phase processing route, gas phase combustion synthesis process, selfpropagating high temperature synthesis (SHS), [7][8][9][10] laser melting, 11 ball milling, 12,13 and carbothermic reductions of metal oxide-boron oxide mixture. [14][15][16] There are research reports on mechanochemical and mechanical alloying route for the production of nanocrystalline TiB 2 powder. 17,18 Nozari et al studied the mechanochemical behavior of TiO 2 -B 2 O 3 -Si system to produce TiB 2 nanoparticles.…”

Interfacial Aspects of Metal Matrix Composites Prepared from Liquid Metals and Aqueous Solutions: A Review

“…In this procedure, Birol prepared a TiC-reinforced aluminum matrix composite [92], while Mahamani developed in-situ TiB 2 /ZrB 2 -reinforced aluminum matrix composites [93]. Other salt-assisted in-situ reinforcements could include TiB 2 [94], TiN nanoparticles [95] or Al 3 Ti [96].…”