Combustion characteristics of WO3/Zn reaction system in SHS process

Tungsten powder was prepared by the Self-Propagating High-Temperature Synth esis (SHS) Process of WO3-Zn mixture. Zn vapor was discovered to affect sig nificantly the combustion parameters such as combustion temperature (T-c), combustion velocity (U), relative mass change (Deltam) and relative elongat ion (Deltah) of the sample. These effects could be reduced by decreasing in ternal Ar pressure and sample density. The ZnO in the product was leached w ith an HCl solution. The Zinc-thermal reduction mechanism was revealed thro ugh a quenching of the sample. (C) 2001 Kluwer Academic Publishers.