Synthesis and characteristics of ternary Be–Ti–V beryllide pebbles as advanced neutron multipliers
Synthesis and characteristics of ternary Be–Ti–V beryllide pebbles as advanced neutron multipliers
复制标题
先进中子倍增器三元 Be-Ti-V 铍化物卵石的合成及特性
DOI：
10.1016/j.fusengdes.2015.09.015
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发表时间：
2016
影响因子：
1.7
通讯作者：
M. Nakamichi
中科院分区：
文献类型：
--
作者：
Jae;M. Nakamichi
提出了一种新的结合等离子体烧结和旋转电极的方法来制造铍柱和卵石。利用这些方法，成功地初步合成了不同化学成分的三元铍化物卵石Be12Ti1−xVx(x= 0.1、0.3、0.5、0.7、0.9和1.0)。扫描电子显微镜观察表明，随着V含量的增加，表面晶粒尺寸减小，而横截面中Be相的面积分数减小。这些减少可能归因于卵石的化学成分与单相Be12V变化密切相关，随着V含量的增加，没有包晶反应，而Be、Be12Ti和Be17Ti2相则由Be12Ti中的包晶反应导致形成大晶粒。这一特性影响了高温下1%水蒸气反应性的变化。结论是，随着 Be12Ti1−xVx 中 V 含量的增加，随着晶粒尺寸以及表面 Be 相的减小，重量增加和 H2 生成量减少。根据氧化测量24小时后的横截面观察，我们发现Be12Ti0.3V0.7和Be12Ti0.1V0.9卵石表现出较高的相稳定性。
A new combined plasma sintering and rotating electrode method for fabricating beryllide rods and pebbles has been suggested. Using these methods, preliminary synthesis of ternary beryllide pebbles with different chemical compositions, Be12Ti1−xVx(x= 0.1, 0.3, 0.5, 0.7, 0.9 and 1.0), was successful. Scanning electron microscopy observations revealed that grain size on the surface decreased, whereas the area fraction of the Be phase in the cross-section decreased as the amount of V increased. These decreases may be attributed to the fact that the chemical composition of the pebble was closely varied to single-phase Be12V, with no peritectic reaction as the amount of V increased, while the Be, Be12Ti, and Be17Ti2phases were formed with large grains caused by a peritecic reaction in Be12Ti. This feature influenced the variation of reactivity with 1% water vapor at high temperatures. It was concluded that weight gain and H2generation decreased with decreases in grain size as well as Be phase on the surface, as the amount of V increased in Be12Ti1−xVx. Based on cross-sectional observations after oxidation measurement for 24 h, we found that Be12Ti0.3V0.7and Be12Ti0.1V0.9pebbles showed high phase stability.