Fabrication and characterization of Be12V pebbles with different diameters
| Autor: | Jae-Hwan Kim, P. Kurinskiy, Masaru Nakamichi |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Fabrication Mechanical Engineering chemistry.chemical_element Blanket Microstructure Atomic packing factor 01 natural sciences 010305 fluids & plasmas chemistry.chemical_compound Beryllide Sphere packing Nuclear Energy and Engineering chemistry 0103 physical sciences General Materials Science Beryllium Composite material 010306 general physics Pebble Civil and Structural Engineering |
| Zdroj: | Fusion Engineering and Design. 146:656-659 |
| ISSN: | 0920-3796 |
| Popis: | 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%. |
| Databáze: | OpenAIRE |
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