Advanced tungsten-containing materials manufacturing from its scrap

Levan Chkhartishvili, Natia Barbakadze, Otar Tsagareishvili, Archil Mikeladze, Tamaz Batsikadze, Manana Buzariashvili, Tamar Dgebuadze, Roin Chedia

Article ID: 9274
Vol 8, Issue 1, 2025

VIEWS - 11 (Abstract) 13 (PDF)

Abstract


We develop a relatively cheap technology of processing a scrap in the form of already used tungsten-containing products (spirals, plates, wires, rods, etc.), as well not conditional tungsten powders. The main stages of the proposed W-scrap recycling method are its dispersing and subsequent dissolution under controlled conditions in hydrogen peroxide aqueous solution resulting in the PTA (PeroxpolyTungstic Acid) formation. The filtered solution, as well as the solid acid obtained by its evaporation, are used to synthesize various tungsten compounds and composites. Good solubility of PTA in water and some other solvents allows preparing homogeneous liquid charges, heat treatment of which yield WC and WC–Co in form of ultradispersed powders. GO (Graphene Oxide) and PTA composite is obtained and its phase transition in vacuum and reducing atmosphere (H2) is studied. By vacuum-thermal exfoliation of GO–PTA composite at 170–500℃ the rGO (reduced GO) and WO2.9 tungsten oxide are obtained, and at 700℃—rGO–WO2 composite. WC, W2C and WC–Co are obtained from PTA at high temperature (900–1000℃). By reducing PTA in a hydrogen atmosphere, metallic tungsten powder is obtained, which was used to obtain sandwich composites with boron carbide B4C, W/B4C, and W/(B4C–W), as neutron shield materials. Composites of sandwich morphology are formed by SPS (Spark-Plasma Sintering) method.


Keywords


tungsten scrap; hydrogen peroxide; peroxpolytungstic acid; graphene oxides; composites; vacuum-thermal exfoliation; tungsten carbides and alloys; spark-plasma sintering; tungsten–boron carbide sandwich composites

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DOI: https://doi.org/10.24294/can9274

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