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Spark plasma sintering of dense alumina ceramics from industrial waste scraps

The implementation of environmentally-friendly manufacturing, which include the reuse and recycling of ma-terials is nowadays crucial in order to meet the circular economy approach. The present study shows the possi-bility of recycling waste alumina scraps obtained after the green machining step during the manufacturing processof alumina ceramics as a broken ware, which contained small amounts (≤5 wt.% in total) of sintering additives inthe form of organic binders and MgO. Dense alumina samples containing various amounts of waste aluminapowder (0–100 wt.%) were produced by spark plasma sintering (SPS) at sintering temperature of 1450°C, dwelltime of 5 min at a 50 MPa of uniaxial pressure. The influence of waste alumina content on microstructure, hardness, and fracture toughness was investigated to determine the possibility of recycling broken ware.

circular economy ; sustainability ; ceramics ; spark plasma sintering ; alumina

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