Sintering behavior, microstructure and mechanical properties of various fluorine-containing Y-SiAlON glass-ceramics
Sintering behavior, microstructure and mechanical properties of various fluorine-containing Y-SiAlON glass-ceramics
复制标题
各种含氟Y-SiAlON微晶玻璃的烧结行为、显微结构和力学性能
DOI：
10.1016/j.jnoncrysol.2014.01.035
复制
发表时间：
2014-03-15
影响因子：
3.5
通讯作者：
Han, Gaorong
中科院分区：
文献类型：
--
作者：
Luo, Zhiwei;Liu, Weizhen;Han, Gaorong
Various fluorine-containing Y-SiAION glass-ceramics from a mixture of Y2O3, alpha-Si3N4, SiO2, and Al2O3 using AlF3 as the fluorine source were prepared by one-step or two-step carbothermal reduction process. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to study the crystallization behavior of the glassceramics. The compositions of the crystals and the glass phase were semi-quantitatively determined by EDX. The final glass-ceramics contained N-containing melilite (Y2Si3O3N4) and p-Si3N4 together with a secondary phase of yttrium aluminum garnet (YAG, Y3Al5O12). The investigated Y-SiAION glass-ceramics with higher F content showed better sintering properties. Fluorine has important effects on crystallization of glass-ceramics as it affects the crystallization mechanism by reducing the thermal energy barrier for crystallization. By controlling the reaction, the Y-SiAlON glass-ceramics are first held at 1300 degrees C for 4 h, which contrasts with the samples obtained after direct sintering at 1550 degrees C, the conversion to Y2Si3O3N4 and beta-Si3N4 is promoted and the final microstructure consists of elongated beta-Si3N4 grains. These glass-ceramics showed relatively better mechanical properties. (C) 2014 Elsevier B.V. All rights reserved.
