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Technologies 2017, 5(2), 28;

Synthesis and Sintering of ZnO Nanopowders

SPCTS, UMR CNRS-Université de Limoges 7315, Centre Européen de la Céramique, Limoges 87068, France
Powder Technology Laboratory, Material Science Institute, Swiss Federal Institute of Technology, Lausanne 1015, Switzerland
Department of Materials Science and Engineering, KTH Royal Institute of Technology, Stockholm 10044, Sweden
Author to whom correspondence should be addressed.
Academic Editor: Paolo Veronesi
Received: 14 April 2017 / Revised: 16 May 2017 / Accepted: 22 May 2017 / Published: 30 May 2017
(This article belongs to the Special Issue Ceramic Technologies and Applications)
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Nanopowders are continuously under investigation as they open new perspectives in numerous fields. There are two main challenges to stimulating their development: sufficient low-cost, high throughput synthesis methods which lead to a production with well-defined and reproducible properties; and for ceramics specifically, the conservation of the powders’ nanostructure after sintering. In this context, this paper presents the synthesis of a pure nanosized powder of ZnO (dv50~60 nm, easily redispersable) by using a continuous Segmented Flow Tubular Reactor (SFTR), which has previously shown its versatility and its robustness, ensuring a high powder quality and reproducibility over time. A higher scale of production can be achieved based on a “scale-out” concept by replicating the tubular reactors. The sinterability of ZnO nanopowders synthesized by the SFTR was studied, by natural sintering at 900 °C and 1100 °C, and Spark Plasma Sintering (SPS) at 900 °C. The performance of the synthesized nanopowder was compared to a commercial ZnO nanopowder of high quality. The samples obtained from the synthesized nanopowder could not be densified at low temperature by traditional sintering, whereas SPS led to a fully dense material after only 5 min at 900 °C, while also limiting the grain growth, thus leading to a nanostructured material. View Full-Text
Keywords: ZnO; ceramic nanopowders; Segmented Flow Tubular Reactor (SFTR); Spark Plasma Sintering (SPS) ZnO; ceramic nanopowders; Segmented Flow Tubular Reactor (SFTR); Spark Plasma Sintering (SPS)

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Aimable, A.; Goure Doubi, H.; Stuer, M.; Zhao, Z.; Bowen, P. Synthesis and Sintering of ZnO Nanopowders. Technologies 2017, 5, 28.

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