Abstract In this study, silicone rubber (polydimethylsiloxane) matrix was incorporated with bismuth (III) oxide and hexagonal boron nitride (hBN) functional fillers to develop a flexible composite material that can shield both neutron and X/gamma radiations. Bismuth, as having a high atomic element weight is a very effective material for X/gamma electromagnetic radiation shielding, while hBN has a very high neutron cross-section due to its boron and nitrogen contents. On the other hand, the matrix material that is high temperature vulcanized (HTV) silicone rubber has superior properties of good flexibility, high transparency, and mechanical properties. Hexagonal boron nitride has unique properties and has a similar structure with graphite that is used for neutron moderation. Mechanical test results showed that the elastic modulus of the optimum sample has improved 4 times compared to control sample. Thermal, X ray and neutron attenuation tests were carried out for the developed composite materials. The curing behaviour was investigated in detail using Moving Die Rheometer. Kinetic studies of the vulcanization process were carried out in a very detailed way and high regression values up to 0.98 has been achieved. Non-destructive radiography images were taken to investigate the particle distribution and radiation attenuation of the prepared composites. It was seen that the composite material developed has a considerable attenuation ratio for both neutron and X/gamma radiations. X-ray attenuation test results for silicone rubber containing 20% Bi2O3 and 20% hBN with thickness of 6.4 mm were shown that the intensity of the incoming rays attenuated by 84.1%. Metal-ceramic-rubber composite material with 6.6 mm thickness shielded 65.8% of incoming neutrons.

中文翻译：

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用于混合伽马和中子辐射屏蔽的金属-陶瓷-橡胶复合材料

摘要 在这项研究中，硅橡胶（聚二甲基硅氧烷）基体与氧化铋 (III) 和六方氮化硼 (hBN) 功能填料相结合，开发出一种可以屏蔽中子和 X/γ 辐射的柔性复合材料。铋具有较高的原子元素重量，是一种非常有效的 X/γ 电磁辐射屏蔽材料，而 hBN 由于其硼和氮含量而具有非常高的中子截面。另一方面，高温硫化（HTV）硅橡胶的基体材料具有良好的柔韧性、高透明度和机械性能等优越性能。六方氮化硼具有独特的性质，并且具有与用于中子慢化的石墨相似的结构。力学测试结果表明，最佳样品的弹性模量比对照样品提高了4倍。对开发的复合材料进行了热、X 射线和中子衰减测试。使用移动模具流变仪详细研究了固化行为。以非常详细的方式进行了硫化过程的动力学研究，并且已经实现了高达 0.98 的高回归值。拍摄非破坏性射线照相图像以研究制备的复合材料的颗粒分布和辐射衰减。可以看出，开发的复合材料对中子和 X/γ 辐射都有相当大的衰减比。含 20% Bi2O3 和 20% hBN 的厚度为 6 的硅橡胶的 X 射线衰减测试结果。4 mm 显示入射光线的强度衰减了 84.1%。6.6 mm 厚的金属-陶瓷-橡胶复合材料屏蔽了 65.8% 的进入中子。