Effects of neutron irradiation on polymorphs of silicon nitride and SiAlON ceramics
Effects of neutron irradiation on polymorphs of silicon nitride and SiAlON ceramics
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中子辐照对氮化硅和SiAlON陶瓷多晶型的影响
DOI：
10.1016/j.jnucmat.2013.01.336
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发表时间：
2013
影响因子：
3.1
通讯作者：
T. Yano
中科院分区：
文献类型：
--
作者：
Areerak Rueanngoen;K. Kanazawa;M. Akiyoshi;M. Imai;Katsumi Yoshida;T. Yano
氮化硅及其相关陶瓷是优良的工程陶瓷，由于其优异的机械性能和其他性能，在核应用中具有重要意义。氮化硅和相关陶瓷包括广泛的化合物，其被分类为两种基本晶体结构，α-和β-Si 3 N4。讨论中子辐照对SiAlON陶瓷影响的报道非常有限，几乎没有关于其多晶型影响的数据。本文采用热压法制备了α相和β相的Si 3 N4和SiAlON，并对其中子辐照效应进行了评价。在日本材料试验堆中，在563 K下，对Si_3N_4和SiAlON陶瓷进行了中子辐照，中子注量为8.5 × 1024 n/m_2（E> 0.1MeV）。测量了由于辐照引起的宏观长度和晶格参数的变化。α-SiAlON和β-Si 3 N4的宏观长度变化幅度相似（0.11-0.14%），几乎是β-Si 3 N4的两倍（0.06%）。SiAlONs的晶格参数变化呈现出复杂的趋势，在两相中a轴扩张，而c轴收缩。在SiAlONs微结构中没有观察到明显的微裂纹、空洞形成或环形成。
Silicon nitride and related ceramics are excellent engineering ceramics and of interest for nuclear applications because of their excellent mechanical and other properties. Silicon nitride and related ceramics include a wide range of compounds, which are categorized into two basic crystal structures, α- and β-Si3N4. Reports discussing neutron irradiation effects on SiAlON ceramics are very limited, and almost no data is available on effects of their polymorphs. In this research, α and β phase of Si3N4and SiAlON were prepared by hot-pressing to evaluate neutron irradiation effects. Si3N4and SiAlON ceramics were neutron-irradiated in the Japan Materials Testing Reactor up to a fluence of 8.5 × 1024n/m2(E> 0.1 MeV) at 563 K. Changes in macroscopic length and lattice parameter due to the irradiation were measured. Changes in macroscopic length of α- and β-SiAlON and α-Si3N4were similar in magnitude (0.11–0.14%), and almost double that of β-Si3N4(0.06%). The lattice parameter changes of SiAlONs showed a complicated trend, expansion of thea-axis and contraction of thec-axis in both phases. No obvious microcracking, void formations, or loop formations were observed in SiAlONs microstructures.
中子辐照β-Si3N4 的缺陷分析
DOI：
--
发表时间：
2006
期刊：
影响因子：
--
作者：
Tomoyuki;Yamagami;Toyohiko;Yano;Masamitsu;Imai;Masafumi;Akiyoshi
通讯作者：
Akiyoshi