Comparative synthesis of Al2O3 via three wet-chemical methods: Implications for sintering behavior and microstructural evolution
发布时间：2026-10-18
点击次数：
DOI码：10.1016/j.jeurceramsoc.2026.118958
发表刊物：Journal of the European Ceramic Society
摘要：Wet-chemical method (WCM) provides a versatile and potentially scalable route for preparing alumina (Al2O3) powder under relatively mild processing conditions. However, a comparative analysis of the structural evolution, phase transformation, and sintering behavior across different WCM-derived precursors remains lacking. In this study, three WCMs—direct precipitation (DP-Al2O3), gas-bubbling-assisted precipitation (GB-Al2O3), and sol-gel synthesis (SG-Al2O3)—were adopted to prepare Al2O3 precursor powders. Their thermal evolution was then compared, focusing on temperature-dependent phase transformations, particle coarsening, and particle morphology evolution. Sintering behavior was likewise assessed under identical thermal profiles. Among the as-synthesized precursors, GB-Al2O3 exhibits the smallest agglomerate size. Both DP-Al2O3 and GB-Al2O3 remain amorphous after calcination at 600 °C, whereas SG-Al2O3 retains residual boehmite alongside amorphous Al2O3. Phase evolution pathways diverge: DP-Al2O3 and SG-Al2O3 follow the conventional γ-Al2O3→θ-Al2O3→α-Al2O3 sequence, while GB-Al2O3 undergo a direct γ- to α-phase transition, bypassing the θ-phase. The SG-Al2O3 displays the lower densification onset temperature than DP-Al2O3 and GB-Al2O3. All three ceramics exhibit heterogeneous densification, resulting in microstructural inhomogeneity featuring coexisting porous and locally densified domains. These results provide actionable guidance for rationally selecting and optimizing WCMs to tailor the particle size, morphology, and phase composition of Al2O3 particles.
合写作者：Xinchen Liu, Mingxi Deng, Yongsheng Chang
第一作者：Le Fu
通讯作者：Huasi Zhou*, Gemei Cai*
卷号：47
页面范围：118958
是否译文：否
发表时间：2026-10-18
发布期刊链接：https://www.sciencedirect.com/science/article/abs/pii/S0955221926008344