Combustion synthesis of nanostructured tungsten and its morphological study

✍ Scribed by Hayk H. Nersisyan; Hyung Il Won; Chang Whan Won; Kyu C. Cho

• Book ID: 104088957
• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 652 KB
• Volume: 189
• Category: Article
• ISSN: 0032-5910
• DOI: 10.1016/j.powtec.2008.07.002

✦ Synopsis

A tungsten trioxide, zinc, and sodium chloride (WO 3 + 3Zn + kNaCl) mixture was used as a precursor material for the manufacture of tungsten (W) nanopowders. Precursor material components were dry mixed and heated up to 450 °C under a constant argon gas flow to promote a combustion reaction. Combustion products were subjected to acid enrichment followed by isothermal heat treatment under hydrogen flow at temperatures ranging from 650 to 850 °C to reduce oxygen concentration. As-synthesized W nanopowders were characterized with respect to average particle size, particle size distribution, oxygen concentration, and phases. Under optimized reaction conditions, W particles with diameters less than 100 nm and an average interstitial oxygen concentration lower than 1.0 wt.% were obtained.