Grain growth behavior of Li4SiO4 pebbles fabricated by agar method for tritium breeder

Grain growth behavior of Li4SiO4 pebbles fabricated by agar method for tritium breeder
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琼脂法制备氚增殖剂Li4SiO4卵石的晶粒生长行为

DOI:
10.1016/j.fusengdes.2016.06.001
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发表时间:
2016-11
影响因子:
1.7
通讯作者:
Yonghong Yu
Yonghong Yu
中科院分区:
工程技术3区
文献类型:
--
作者:
Maoqiao Xiang;Yingchun Zhang;Yun Zhang;Chaofu Wang;Wei Liu;Yonghong Yu

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Li 4SiO 4氚增殖卵石将填充在包层中,并在高温下使用2年或更长时间,这将增加晶粒尺寸并影响氚释放。因此,通过琼脂法制备的Li 4SiO 4小球的粒度进行了研究,并使用了两种不同的硅源(晶体和非晶SiO2)具有不同的粒度。SiO2的粒径大小会影响Li 4SiO 4卵石的粒径和密度。采用等温烧结法研究了Li 4SiO 4的晶粒长大动力学。采用唯象动力学方程计算了晶粒长大指数n和激活能Q。计算的d值分别为4.10、3.98、3.34和2.96,相应的Q值分别为152.15、147.99、125.54和110.58kJ/mol。在较高的烧结温度(950和1000 °C)下,Li 4SiO 4的晶粒生长受气相传输控制。
The Li4SiO4tritium breeding pebbles will be filled in the blanket and used for 2 years or more at high temperatures, which would increase the grain size and affect tritium release. Hence, grain sizes of the Li4SiO4pebbles fabricated by agar method were investigated, and two kinds of different silicon sources (crystal and amorphous SiO2) with different particle sizes were used. The particle size of SiO2could affect grain size and density of the Li4SiO4pebble. And the isothermal sintering was carried out to study the grain growth kinetics of Li4SiO4. The grain growth exponent (n) and the activation energy (Q) were calculated by the phenomenological kinetic equation. The calculatednvalues were 4.10, 3.98, 3.34 and 2.96, and correspondingQvalues were 152.15, 147.99, 125.54 and 110.58 kJ/mol, respectively. At the higher sintering temperatures (950 and 1000 °C), the grain growth of Li4SiO4was controlled by vapor transport.
DOI: 10.1016/s0022-3115(97)00203-1
发表时间: 1997-09
影响因子: 3.1
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