Synthesis and classification of WC and W metals via organic–inorganic complex precursors

概要

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Mono-tungsten carbide (WC) and tungsten (W) have been successfully synthesized and classified by controlling organic–inorganic hybrid precursors. Tungstic acid (H2WO4) was dissolved into ammonium water and then citric acid (C6H8O7) as a carbon source was dissolved into the H2WO4 solution. The precursors, which were obtained by drying the chemical complex solutions, were heated at 1473 K for 1 h with Ar gas flow by a conventional electric furnace. Classification of WC and W was achieved by controlling the precursor processing conditions. In terms of making WC only, two important processing factors were revealed. One, the C/W molar ratio of an organic–inorganic hybrid precursor should be more than 4.0, and two, the obtained chemical complex should be re-dissolved and aged for more than 24 h. Tungstic ions in the re-dissolved chemical complex solution may be changed into polyanions. The sizes of the obtained WC particles and W metal were approximately 100 nm and 2 µm, respectively.
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