A Novel High-Temperature Resistant Neutron Shielding Material Prepared by Negative Pressure Impregnation Method Based on Interpenetrating Network of Foam Ceramics
LIU Yunfu1, LIU Feng2, YAO Chuqing1, JIANG Danfeng2, HAN Wenmin1, DAI Yaodong1,*
1 College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106, China 2 China Nuclear Power Technology Research Institute,Shenzhen 518028, Guangdong, China
Abstract: In this work, a novel ceramic foam/boron phenolic resin composite with interpenetrating network structure was prepared. Mullite/boron carbide skeleton reinforcement was prepared by organic foam impregnation and inert atmosphere sintering, and boron carbide/boron phenolic resin matrix was prepared by negative pressure impregnation and in situ curing. The effects of powder content (10%—30% boron carbide and kaolin) and sintering temperature (1 300—1 500 ℃) on ceramic skeleton and composite were investigated experimentally. It was found that when the sintering temperature was 1 350 ℃ and the skeleton ratio was 55% alumina, 15% boron carbide, 25% kaolin and 5% titanium dioxide respectively, the comprehensive performance of the new neutron shielding composite material was optimized with 20wt% boron carbide/boron phenolic resin. At this situation, the linear shrinkage, bulk density, apparent porosity and compressive strength of foam ceramic skeleton were 3.36%, 0.54 g/cm3, 73.7% and 0.94 MPa respectively. The apparent porosity, bulk density and compressive strength of ceramic/boron-phenolic resin composites were 0.2%, 1.22 g/cm3 and 86 MPa respectively. After ageing 10 h at 300 ℃, the residual compressive strength, residual ratio and service temperature of composites were 54 MPa, 62% and 180—330 ℃ respectively. After soaking in 10wt% boric acid solution for 72 h, the residual compressive strength, residual ratio and weight loss of composites were 82.5 MPa, 95.7% and 0.31% respectively. When placed in front of the 241Am-Be neutron source, the total neutron linear attenuation coefficient and total neutron shielding rate of composites(12—13 mm)were 0.356 cm-1 and 35.5%, while the thermal neutron linear attenuation coefficient and thermal neutron shielding rate of composites were 1.061 cm-1 and 73.0%.The novel neutron shielding material not only has a three-dimensional interpenetrating network structure, but also contains a multistage structure including boron skeleton/boron resin/boron filler, which provides a reference for the design of a novel neutron shielding material with excellent performance and high temperature resistance.
刘云福, 刘峰, 姚初清, 蒋丹枫, 韩文敏, 戴耀东. 基于泡沫陶瓷三维互穿网络负压浸渍法制备新型耐高温中子屏蔽材料[J]. 材料导报, 2023, 37(8): 21090118-9.
LIU Yunfu, LIU Feng, YAO Chuqing, JIANG Danfeng, HAN Wenmin, DAI Yaodong. A Novel High-Temperature Resistant Neutron Shielding Material Prepared by Negative Pressure Impregnation Method Based on Interpenetrating Network of Foam Ceramics. Materials Reports, 2023, 37(8): 21090118-9.
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2023, Vol. 37 
