材料科学
莫来石
层状结构
晶粒生长
热稳定性
复合材料
纤维
扩散
晶界
微观结构
化学工程
陶瓷
热力学
物理
工程类
作者
Chaozhong Wu,Lingjiao Zhan,Haotian Liu,Juan Wang,Wensheng Liu,Shuwei Yao,Yunzhu Ma
标识
DOI:10.1016/j.jeurceramsoc.2023.09.016
摘要
Understanding the mechanism of the oriented growth in multi-component alumina-based fibers and inhibiting its progression is crucial for enhancing their thermal stability. In this study, a novel diphasic fiber composed of lamellar α-Al2O3 and mosaic-like mullite grains was prepared. We discussed the oriented growth behavior of lamellar α-Al2O3 grains and the diffusion phenomenon of the Al element in SiO2 substrate under the combined addition of iron sol and La2O3, proposing a new mechanism for oriented growth in diphasic fibers. The diffusion of the Si element to the tips of alumina grains contributed to a significant increase in the mobility of non-basal planes, resulting in (0001) surface growth of α-Al2O3 grains. Furthermore, the La segregation at grain boundaries significantly impeded the oriented growth of α-Al2O3 grains, which was critical for improving the thermal stability of multiphase alumina-based fibers.
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