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

doi:10.11896/cldb.21090118

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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.

Key words： three dimensional interpenetrating network multistage structure of boron system mullite ceramic/resin composites neutron shielding material

Published: 25 April 2023 Online: 2023-04-24

CLC number:	X34
	X946

Fund:‘13th Five-year Plan' Nuclear Energy Development and Scientific Research Project.

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	Articles by authors
	LIU Yunfu
	LIU Feng
	YAO Chuqing
	JIANG Danfeng
	HAN Wenmin
	DAI Yaodong

Cite this article:

LIU Yunfu,LIU Feng,YAO Chuqing, et al. A Novel High-Temperature Resistant Neutron Shielding Material Prepared by Negative Pressure Impregnation Method Based on Interpenetrating Network of Foam Ceramics[J]. Materials Reports, 2023, 37(8): 21090118-9.

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http://www.mater-rep.com/EN/10.11896/cldb.21090118 OR http://www.mater-rep.com/EN/Y2023/V37/I8/21090118

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