Composite W–Cu powders by joint reduction of oxides in combustion mode
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Composite powders W–Cu were prepared via joint reduction of WO3 and CuO oxides with Mg‒C combined reducer in a combustion mode by using the method of coupled reactions. Combustion phenomenology and the processes of phase and microstructure formation were investigated by thermocouple and copper- wedge techniques combined with XRD, SEM, and EDS analyses. Thermal conditions of combustion and phase composition and microstructure of products were found to depend on a Mg/C ratio in green mixtures. It was established that the magnesiothermic reaction was preceded by the stage of low-caloric carbothermal reduction. Slow propagation of combustion wave was found to favor the complete reduction of oxides and formation of target W–Cu composite nanopowder.
Keywordscombustion synthesis W–Cu composite pseudoalloy combined reducer reduction mechanism
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