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Formation of W–Y2O3 Spherical Composite Powders in a Thermal Plasma Flow
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DOI：10.1002/adem.71062.png)
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Abstract
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The study investigates a process for producing W–Y2O3 spheroidized powders in the 5–50 µm size fraction, consisting of particles with a fine-grained structure. The powders are produced using an approach that includes sequential stages of plasma-chemical synthesis of nanopowders, their granulation, and plasma spheroidization of the formed microgranules. The formation mechanisms of nanopowders containing 0.3, 1.2, and 5.0 wt% Y2O3 in a nitrogen-hydrogen thermal plasma jet is established. The parameters and conditions of the plasma-chemical synthesis are determined under which complete conversion of the initial reactants into the target products (W and Y2O3) is achieved. Established are the dependencies of the size, morphology, yield, and productivity of W–Y2O3 granules on the suspension composition and spray drying parameters. Plasma treatment of microgranules has been demonstrated to facilitate the production of powders exhibiting a high degree of spheroidization and a predominantly dense particle microstructure, characterized by tungsten grain sizes ranging from 0.1 to 3.0 μm and a uniform distribution of yttrium oxide.
Keywords:
plasma spheroidization
plasma-chemical synthesis
spherical powder
spray drying
tungsten
yttrium oxide
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3.3
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9.1K
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2.2W
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