Abstract
A key issue, in the development of very fine grades, is to produce materials with high uniformity. The aqueous chemistry of tungsten offers several possibilities for the synthesis of homogenous molecular precursors containing W and Co mixed on the atomic scale. Powders containing (NH 4 ) 8 [H 2 Co 2 W 11 O 40 ] have been prepared starting from sodium tungstate or ammonium metatungstate. Nanophase powders of WCo and WCCo powders were obtained after reduction at 750 °C under H 2 and carburisation at 1000 °C under H 2 /CH 4. Hard materials with submicron microstructures were obtained after sintering at 1410°C.
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