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首页> 美国卫生研究院文献>Materials >Neutron Shielding Performance of 3D-Printed Boron Carbide PEEK Composites
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Neutron Shielding Performance of 3D-Printed Boron Carbide PEEK Composites

机译：3D打印碳化硼PEEK复合材料的中子屏蔽性能

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摘要

Polyethylene is used as a traditional shielding material in the nuclear industry, but still suffers from low softening point, poor mechanical properties, and difficult machining. In this study, novel boron carbide polyether-ether-ketone (PEEK) composites with different mass ratios were prepared and tested as fast neutron absorbers. Next, shielding test pieces with low porosity were rapidly manufactured through the fused deposition modeling (FDM)-3D printing optimization process. The respective heat resistances, mechanical properties, and neutron shielding characteristics of as-obtained PEEK and boron carbide PEEK composites with different thicknesses were then evaluated. At load of 0.45 MPa, the heat deformation temperature of boron carbide PEEK increased with the boron carbide content. The heat deformation temperature of 30% wt. boron carbide PEEK was recorded as 308.4 °C. After heat treatment, both tensile strength and flexural strength of PEEK and PEEK composites rose by 40%–50% and 65%–78%, respectively. Moreover, the as-prepared composites showed excellent fast neutron shielding performances. For shielding test pieces with thicknesses between 40 mm and 100 mm, the neutron shielding rates exhibited exponential variation as a function of boron carbide content. The addition of 5%–15% boron carbide significantly changed the curvature of the shielding rate curve, suggesting an optimal amount of boron carbide. Meanwhile, the integrated shielding/structure may effectively shield neutron radiation, thereby ensuring optimal shielding performances. In sum, further optimization of the proposed process could achieve lightweight materials with less consumables and small volume.
机译：聚乙烯在核工业中用作传统的屏蔽材料，但软化点低，机械性能差且加工困难。在这项研究中，制备了具有不同质量比的新型碳化硼聚醚醚醚酮（PEEK）复合材料，并作为快速中子吸收剂进行了测试。接下来，通过熔融沉积建模（FDM）-3D打印优化过程快速制造了低孔隙度的屏蔽测试件。然后评估了获得的具有不同厚度的PEEK和碳化硼PEEK复合材料的各自的耐热性，力学性能和中子屏蔽特性。在0.45 MPa的载荷下，碳化硼PEEK的热变形温度随碳化硼含量的增加而增加。热变形温度为30重量％。记录碳化硼PEEK为308.4℃。经过热处理后，PEEK和PEEK复合材料的拉伸强度和弯曲强度分别提高了40％–50％和65％–78％。此外，所制备的复合材料表现出优异的快速中子屏蔽性能。对于厚度在40毫米至100毫米之间的屏蔽试件，中子屏蔽率呈现出随碳化硼含量变化的指数变化。添加5％–15％的碳化硼会显着改变屏蔽率曲线的曲率，表明碳化硼的最佳用量。同时，集成的屏蔽/结构可以有效地屏蔽中子辐射，从而确保最佳的屏蔽性能。总而言之，对提议工艺的进一步优化可以实现耗材少，体积小的轻质材料。

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