Elaboration of Yttrium Aluminum Garnet (YAG) nanopowders and ceramics: Comparison between batch and plug-flow reactor

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS Open Ceramics Pub Date : 2024-09-11 DOI:10.1016/j.oceram.2024.100675

Florian Delaunay, Lucie Chrétien, Rémy Boulesteix, Alexandre Maître

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Abstract

In this study YAG (Y₃Al₅O₁₂) nanopowders have been synthetized by a reverse co-precipitation method with two different designs of reactors: batch and plug-flow. The impact of both the reactor design and the synthesis temperature on the features of nanopowders so-synthetized was studied. The reactor design governs the pH evolution and precipitation kinetics during synthesis. Correlations were found between the reactor design and nanopowders stoichiometry and morphology. The plug-flow reactor allows obtaining homogeneous, well-crystallized and single-phased YAG nanopowders after calcination. Then, the sintering ability of as-obtained nanopowders was investigated. Fully dense YAG-based ceramics were obtained with the nanopowders made from the plug-flow reactor by combining uniaxial pressing and sintering at 1700 °C. Finally, a plug-flow reactor with very simple and inexpensive design would allow easier upscale of the synthesis process of YAG-based nanopowders with well-controlled morphology and stoichiometry. As a result, YAG based transparent ceramic were obtained without sintering additive.

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钇铝石榴石（YAG）纳米粉体和陶瓷的制备：间歇式反应器与塞流式反应器的比较

本研究采用反向共沉淀法合成了 YAG（Y3Al5O12）纳米粉体，并使用了两种不同设计的反应器：间歇式反应器和塞流式反应器。研究了反应器设计和合成温度对所合成纳米粉体特征的影响。反应器的设计决定了合成过程中 pH 值的变化和沉淀动力学。研究发现，反应器设计与纳米粉体的化学计量和形态之间存在相关性。塞流式反应器可以在煅烧后获得均匀、结晶良好和单相的 YAG 纳米粉体。然后，研究了获得的纳米粉体的烧结能力。利用塞流反应器制备的纳米粉体，结合单轴压制和 1700 ℃ 烧结，获得了完全致密的 YAG 基陶瓷。最后，塞流式反应器的设计非常简单且成本低廉，可以更容易地扩大具有良好形态和化学计量学控制的 YAG 基纳米粉体合成工艺的规模。因此，无需烧结添加剂就能获得基于 YAG 的透明陶瓷。

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