Optimisation of W2B-W composites for radiation attenuation and thermal-mechanical performance
Optimisation of W2B-W composites for radiation attenuation and thermal-mechanical performance
复制标题
DOI：
10.1016/j.nme.2022.101349
复制
发表时间：
2022-12
影响因子：
2.6
通讯作者：
S. Humphry-Baker;Ouguzi Aihemaiti;E. Ivanov;E. Del Rio;C. Windsor;J. Astbury
中科院分区：
文献类型：
--
作者：
S. Humphry-Baker;Ouguzi Aihemaiti;E. Ivanov;E. Del Rio;C. Windsor;J. Astbury
对复合辐射屏蔽材料 W2B-W 的中子学和工程性能进行了系统研究。使用 MCNP 代码进行的中子学计算表明，体积分数 W2B 每增加 1%，进入超导核心的中子能量通量就会减少 0.4–0.9%，伽马通量会减少 1.0–2.2%，具体取决于屏蔽厚度。 W2B 体积分数分别为 43% 和 89% 的材料通过真空热压制造，形成主要互穿相分别为 W 和 W2B 的微观结构。对于W2B主导材料，热物理和机械性能较差。例如，室温弯曲强度、断裂韧性和导热率均较低（分别降低约 25%、30% 和 40%）。此外，脆性到延性的转变温度高出约 500°C。结果表明，当考虑硼化物含量时，屏蔽性能和抗热应力之间存在重要的权衡。
The neutronics and engineering properties of a composite radiation shielding material, W2B-W, are systematically investigated. Neutronics calculations using the MCNP code indicate that each additional 1 % volume fraction W2B reduces the neutron energy flux into the superconducting core by 0.4–0.9 %, and reduces the gamma flux by 1.0–2.2 %, depending on the shield thickness. Materials with W2B volume fractions of 43 and 89 % are fabricated by vacuum hot-pressing, resulting in a microstructure in which the dominant interpenetrating phase was W and W2B respectively. For the W2B-dominant material the thermophysical and mechanical properties were inferior. For example, room temperature flexural strength, fracture toughness, and thermal conductivity were all lower (by ∼25%, 30% and 40% respectively). Also, the brittle to ductile transition temperature was ∼500 °C higher. The results indicate that when considering boride content there is an important trade-off between shielding performance and thermal stress resistance.