碳化硼/聚四氟乙烯新型中子吸收复合材料的制备及性能研究
Preparation and Properties of B4C/PTFE Neutron Absorbing Composites
DOI: 10.12677/MS.2018.86090, PDF,  被引量    科研立项经费支持
作者: 曹 磊, 杜慧玲：西安科技大学材料科学与工程学院，陕西 西安；柯于斌, 陶举洲：东莞中子科学中心中子科学部，广东 东莞；顾旭东：中国科学技术大学物理学院，安徽 合肥；朱 林：南华大学核科学技术学院，湖南 衡阳
关键词: 复合材料；碳化硼；聚四氟乙烯(PTFE)；中子吸收材料；Composite Materials； Boron Carbide； Polytetrafluoroethylene (PTFE)； Neutron Absorption
摘要: 采用低温液相烧结法制备了碳化硼(B4C)/聚四氟乙烯(PTFE)新型无氢中子吸收复合材料，在380℃下实现了致密烧结。通过同步热分析仪(TG-DSC)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)等对复合材料的烧结过程、结构组成和微观形貌进行了分析。此外，本文研究了B4C含量变化对样品力学性能和中子吸收能力的影响。研究结果表明：随着复合材料中B4C含量的降低，其相对密度和冲击韧性逐渐增大；硬度逐渐减小。复合材料中子吸收能力的中子输运蒙卡模拟计算(MCNPX)结果表明，随着B4C含量的减少，其慢中子吸收能力逐渐降低。在所研究的复合材料中，当B4C含量为70 wt%，厚度为5 mm时，其对1Å波长中子的透射率为2.45 × 10−6，可满足中子散射谱仪束线吸收材料的通常应用要求。
Abstract: Boron carbide (B4C)/polytetrafluoroethylene (PTFE) neutron absorbing composite materials were prepared by liquid phase sintering method at 380˚C. The themogravimetry-differential scanning calorimetry (TG-DSC) was adopted to characterize the sintering process while X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) techniques were used to investigate the phase constitution and microstructure of the composites. In addition, the influence of B4C content on the mechanical and neutron absorbing properties of the composites was tested. Results indicate that the relative density and impact toughness gradually increase while the hardness drops with decreasing B4C content. Lowering the B4C content however reduces neutron absorption capacity, as confirmed by the MCNPX simulations. The transmissivity of B4C/PTFE composite is 2.45 × 10−6 for 1Å neutrons through a 5 mm-thick sample with 70 wt% B4C content. This hydrogen-free composite is a suitable neutron absorber for beam line shielding purposes.
文章引用：曹磊, 柯于斌, 陶举洲, 杜慧玲, 顾旭东, 朱林. 碳化硼/聚四氟乙烯新型中子吸收复合材料的制备及性能研究[J]. 材料科学, 2018, 8(6): 762-774. https://doi.org/10.12677/MS.2018.86090

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