Fabrication and characterization of Be12V pebbles with different diameters
Fabrication and characterization of Be12V pebbles with different diameters
复制标题
不同直径Be12V卵石的制备与表征
DOI：
10.1016/j.fusengdes.2019.01.048
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发表时间：
2019
影响因子：
1.7
通讯作者：
M. Nakamichi
中科院分区：
文献类型：
--
作者：
P. Kurinskiy;Jae;M. Nakamichi
所设计的 DEMO 反应器的卵石床毯需要在高温下具有较低膨胀和较高稳定性的中子倍增器。在铍基金属间合金中，铍化钒Be12V被认为是一种有吸引力的材料，因为它具有作为增殖层的先进中子倍增器的潜在用途。本研究采用旋转电极法（REM），使用等离子烧结Be-V电极制造球形Be12V卵石。 Be-V电极作为原料，起到靶材的作用，在REM装置的充氦气氛中熔化并以球形液滴的形式离心喷射。由于Be-V棒的旋转角速度是对所产卵石尺寸影响较大的重要工艺参数之一，因此造粒工艺选择较宽的操作范围（2000~10000 rpm），并对所产卵石批次进行分析。本文对制备的钒铍卵石的屈服性能、尺寸和微观结构的一些特征进行了总结和讨论。除此之外，对由 Be12V 卵石组成的单尺寸和二元尺寸卵石床堆积密度的调查结果表明，最大达到的堆积系数值分别约为 64-65 和 80%。
Neutron multipliers with lower swelling and higher stability at elevated temperatures are desired for the pebble bed blankets of designed DEMO rector. Among beryllium-based intermetallic alloys, vanadium beryllide Be12V is considered to be an attractive material from the point of view of its potential use as an advanced neutron multiplier of the breeding blanket.Rotating electrode method (REM) was applied in this study for fabrication of sphere-shaped Be12V pebbles using a plasma-sintered Be-V electrode. Be-V electrode as raw material played a role of the target which was melted and centrifugally ejected in the form of spherical droplets in the helium-filled atmosphere of REM apparatus. Since the angular rotation speed of Be-V rod is one of the important technological parameters which significantly influences the sizes of produced pebbles, the wide operating range (2000–10000 rpm) was selected by granulation process and produced batches of pebbles were analyzed. The yield properties, sizes and some characteristics of microstructure of fabricated vanadium beryllide pebbles are summarized and discussed in this work. Besides this, the first results on investigation of the packing density of single- and binary-sized pebble beds consisting of Be12V pebbles showed that the maximal achieved packing factor values are, accordingly, about 64–65 and 80%.