放射線遮蔽に有効な複合材料を開発（Engineered Composite Materials Offer Broad-spectrum Synergistic Radiation Shielding）

2025-06-20 中国科学院(CAS)

Figure 1. SEM images of micron spindle-shaped PbWO₄-I (a), micron spherical PbWO₄-II (b), rough micron spherical PbWO₄-III (c), commercial PbWO₄ (d). (Image by HUO Zhipeng)

＜関連情報＞

• https://english.cas.cn/newsroom/research_news/phys/202506/t20250620_1045932.shtml
• https://www.sciencedirect.com/science/article/abs/pii/S1359835X25003057?via%3Dihub

中性子とガンマ線を相乗的に遮蔽する微細構造制御可能なPbWO4フィラー強化B4C/HDPE複合材料 Microstructure regulatable PbWO4 fillers reinforced B4C/HDPE composites for synergistic radiation shielding of neutron and gamma-ray

Zhipeng Huo, Zuoyang Chen, Yidong Lu, Guoqiang Zhong
Composites Part A: Applied Science and Manufacturing  Available online: 6 May 2025
DOI:https://doi.org/10.1016/j.compositesa.2025.109011

Abstract

PbWO₄/B₄C/HDPE composites doped with synthesized regular-shaped PbWO₄ fillers with different microstructures are prepared to shield neutron and gamma-ray. The effect of filler morphology on various properties of the composites is detailed investigated. X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM) reveal that different crystallinity and crystal growth priority of the crystal planes of PbWO₄ generate different microstructures. SEM and Brunauer-Emmett-Teller (BET) specific surface area test reveal that the rough micron spherical PbWO₄-III fillers exhibit significantly larger specific surface area (S_BET = 9.99 m²/g) than others due to its significantly rougher surface containing abundant secondary granular structures. The PbWO₄-III/B₄C/HDPE composite exhibits the best melting temperatures (T_p = 133.8 °C) and mechanical properties due to its increased thermal restriction sites and interfacial compatibility between fillers and matrix caused by the high S_BET and homogeneous particle size of PbWO₄-III fillers. The accelerated ultraviolet ageing test reveals that PbWO₄ reinforced composites exhibit excellent anti-ultraviolet ageing properties. The PbWO₄/B₄C/HDPE composites exhibit significant enhancements of radiation shielding performance due to the synergistic shielding effect caused by PbWO₄, B₄C and HDPE. The superior PbWO₄-III/B₄C/HDPE composite exhibits the best total neutron cross-section (Σ = 0.224 cm⁻¹) and linear attenuation coefficient (μ = 0.107 cm⁻¹) due to the increased probability of interaction between the composite and radiation particles rendered by the superior S_BET and dispersion of PbWO₄-III fillers.