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Preparation and Shielding Performance of Gadolinium-Bismuth-Epoxy Composite Coatings
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DOI：10.11777/j.issn1000-3304.2025.25241.png)
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Abstract
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To resolve the problems of traditional lead-based substrates, such as low shielding efficiency in the energy range of 40-88 keV, biological toxicity, and the deterioration of mechanical properties caused by filler agglomeration in epoxy matrix, we put forward a core-shell structure optimization-surface chemical bondingstrategy to fabricate gadolinium-bismuth-epoxy composite shielding coatings. Using gadolinium oxide and bismuth oxide as the cores, Bi@Si/Gd@Si core-shell nanoparticles were synthesized. Subsequently, the amino groups were introduced onto the surface of the nanoparticles through KH550 modification. Finally, these nanoparticles were compounded with epoxy resin. After ultrasonic dispersion and a heat curing process, the gadolinium-bismuth-epoxy composite shielding coatings were successfully fabricated. Both the thermal stability and mechanical properties of the composite coatings were enhanced by incorporation of fillers. The bonding strength of the composite coatings (with 50% filler loading) reached 25.80 MPa. The X-ray shielding efficiency of the coatings for 129I source was 93.8%. The theoretical thickness required to half shielding of the intensity of gamma-rays from 137Cs source was 3.63 cm. This coating combined high bonding strength and excellent shielding efficiency could be applied to the equipment via spraying or other techniques, thus presenting broad application prospects in fields such as nuclear power plants and space station protection.
Keywords:
Epoxy resin
Core-shell structure
Radiation shielding
Coatings
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