Abstract：To address the issues of complex processing, high energy consumption, and difficulties in uniformity control associated with existing methods for preparing W-Mo alloy nanopowders, this study proposes a novel combined process of chemical coprecipitation, calcination, and self-propagating high-temperature synthesis. Using ammonium paratungstate and ammonium molybdate as raw materials, a composite oxide precursor with a single W0.4Mo0.6O3 solid solution structure was prepared via coprecipitation followed by calcination at 550 ℃, thereby achieving atomic-scale homogeneous mixing of W and Mo elements. The effects of the material ratio on the phase constitution and microstructure of the products obtained by magnesiothermic reduction self-propagating high-temperature synthesis were systematically investigated by scanning electron microscope, energy dispersive spectrometer, X-ray diffractometer, and X-ray photoelectron spectrometer. The results indicate that a fully alloyed single solid-solution phase can be obtained when the mass ratio of the precursor to Mg powder is 1∶1. The addition of an equal mass of NaCl diluent effectively moderates the combustion temperature and mass transfer conditions, inhibits grain growth and particle agglomeration, and enables the successful preparation of crushable W-44Mo alloy nanopowder with an average particle size of approximately 30 nm and uniform composition. This method provides a new approach for the efficient preparation of high-melting-point alloy powders.
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2026, Vol. 31 
