Liu Zhaoyang, Wang Junyang, Zhao Zixu, Yang Qiuyu, Qin Lihang, Zhang Kaichen, Wang Xiangnan, Su Nan, Wen Tianpeng, Yuan Lei, Yu Jingkun
Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Northeastern University, Shenyang 110819, China.
School of Metallurgy, Northeastern University, Shenyang 110819, China.
Materials (Basel). 2023 Aug 18;16(16):5679. doi: 10.3390/ma16165679.
AlO-bonded SiAlON ceramic with self-coating was prepared using aluminum dross and silicon solid waste as starting materials under ambient air conditions. The changes in phase, microstructure, and physical properties of the ceramic with temperature were analyzed and the formation mechanism of the SiAlON phase was elucidated. The results showed that higher temperature was more suitable for the preparation of SiAlON ceramics. As the temperature increased from 1400 to 1600 °C, the main phases in the ceramic transformed from mullite, AlO, and SiAlON to AlO and SiAlON. An AlO-rich layer spontaneously coated the surface of the porous ceramic as Al melted and oxidized at high temperature. The thickness of this layer decreased as the temperature increased. The presence of AlO-rich coating layer impeded air flow, allowing nitriding of Si and Al, and the formation of the SiAlON phase in ambient air conditions. This study not only presents a strategy to successfully recycle aluminum dross and silicon solid waste but also offers a straightforward approach to preparing SiAlON material in air atmosphere.
以铝灰和硅废渣为原料，在环境空气条件下制备了具有自涂层的AlO键合SiAlON陶瓷。分析了陶瓷的相、微观结构和物理性能随温度的变化，并阐明了SiAlON相的形成机理。结果表明，较高的温度更适合制备SiAlON陶瓷。随着温度从1400℃升高到1600℃，陶瓷中的主要相从莫来石、AlO和SiAlON转变为AlO和SiAlON。当Al在高温下熔化并氧化时，富含AlO的层自发地包覆在多孔陶瓷表面。该层的厚度随着温度的升高而减小。富含AlO的涂层的存在阻碍了空气流动，使得Si和Al能够进行氮化，并在环境空气条件下形成SiAlON相。本研究不仅提出了一种成功回收铝灰和硅废渣的策略，还提供了一种在空气气氛中制备SiAlON材料的直接方法。
