| Ultrafine powders of tungsten-based alloy (W-Ni-Fe) and zirconium carbide (ZrC) were synthesized by a soda reduction process, which is newly proposed in this study. Ultrafine-sized tungsten alloy powders were synthesized with ammonium metatungstate (AMT), iron(II) chloride tetrahydrate (FeCl2·4H2O), and nickel chloride hexahydrate (NiCl2·6H2O) as source materials and sodium tungstate dehydrate (Na2WO4·2H2O) as a reductant. In the preparation of mixtures, the amounts of the source components were chosen to obtain a composition of 93W-5Ni-2Fe. Nano-sized zirconium carbide (ZrC) powders were fabricated by source materials of zirconium(IV) chloride (ZrCl4) and carbon black, and a reductant of sodium bicarbonate (NaHCO3). ZrC powders with about 150 nm in size were successfully obtained after heat treatment at 1637K. |
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