Effects of nitrogen on phase formation, microstructure and mechanical properties of Y-Ca-Si-Al-O-N oxynitride glass-ceramics
Effects of nitrogen on phase formation, microstructure and mechanical properties of Y-Ca-Si-Al-O-N oxynitride glass-ceramics
复制标题
氮对Y-Ca-Si-Al-O-N氮微晶玻璃相形成、显微结构和力学性能的影响
DOI：
10.1016/j.jnoncrysol.2013.03.005
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发表时间：
2013-05
影响因子：
3.5
通讯作者：
Liu, Weizhen
中科院分区：
文献类型：
--
作者：
Luo, Zhiwei;Lu, Anxian;Hu, Xiaolin;Liu, Weizhen
研究了氮取代对Y-Ca-Si-Al-O-N系氮氧化物玻璃析晶的影响。根据差示扫描量热仪(DSC)测量提供的信息选择合适的热处理温度。随着氮素含量的增加，Tgand Tc值显著增加。X射线衍射和扫描电子显微镜分析表明，对于含氮6%和12%的氧化物玻璃和氮氧化物玻璃，晶化形成了不规则的板条状Ca4Y6O(SiO4)6和棒状钙长石。当氮含量增加到18或24当量%时，主晶相为不规则的片状Y-Al石榴石。当氮含量增加到30当量%时，微观的针状Al6O3N4晶体成为唯一的晶相。由于力学性能(例如，弯曲强度为162 Mpa，维氏硬度为8.5 Gpa)，最佳成分对应于氮含量为24当量%。
The effect of nitrogen substitution on the crystallisation of an oxynitride glass in the Y–Ca–Si–Al–O–N system has been studied. The appropriate heat treatment temperatures were selected according to the information provided by the differential scanning calorimeter (DSC) measurement. There is a significant increase in Tgand Tcwith increasing nitrogen content. X-ray diffraction (XRD) and scanning electron microscope (SEM) analysis demonstrated that, for the oxide glass and oxynitride glasses containing 6 equiv.% and 12 equiv.% nitrogen, crystallisation results in the formation of irregular lath-shaped Ca4Y6O(SiO4)6and stick-shaped anorthite. As the nitrogen content increases to 18 or 24 equiv.%, irregular plate-like yttrium-aluminium garnet (YAG) is identified as the main crystalline phase. As the nitrogen content increases to 30 equiv.%, microscopic needle-like crystals of Al6O3N4become the only crystallised phase. The best composition, owing to the mechanical properties (e.g. flexural strength of 162MPa and Vickers hardness of 8.5GPa), was found to correspond to a nitrogen content of 24 equiv.%.
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