Outstanding thermal neutrons shields based on epoxy, UHMWPE fibers and boron carbide particles

Mehelli, Oussama; Derradji, Mehdi; Belgacemi, Raouf; Abdous, Slimane; Habes, Abdelmalek; Liu, Wenbin

doi:10.1016/j.apradiso.2021.109837

Cited by 12 publications

(14 citation statements)

References 17 publications

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“…Moreover, it is defined as the thickness through which half of the incident neutronic flux is attenuated, as described in equation (2). 35 Furthermore, in order to get more insight into the shielding performances of the developed BA-PBz/B 4 C nanocomposites, the screening ratio (S%) was evaluated using equation (3), 35 and the results are shown in Figure 14.…”

Section: Nuclear Radiation Shielding Propertiesmentioning

confidence: 99%

“…33,34 Additionally, these benzoxazine resins have gained much interest, mainly because they can be investigated as matrix doped with effective radiation protection materials like boron-based ceramic nanoparticles: boron, boron-carbide, and boron nitride to develop a nanocomposite that can serve as a lightweight shielding nanocomposite. 35 Boron carbide (B 4 C), with its high covalent bond content (the covalent bond content exceeds 93%), 36,37 is considered one of the most rigid materials existing in nature after diamond and cubic boron nitride. 36,38 A variety of precursors and techniques have been reported for the synthesis of boron carbides, such as sintering, [39][40][41] sol-gel, 42,43 high-energy mill, 43 and microwave radiation.…”

Section: Introductionmentioning

confidence: 99%

“…46 Recently, boron carbide has received great attention in nuclear protection; for instance, it has been proved that boron carbide/epoxy composite shows interesting radiation protection ability against ionizing radiations. 35 In this article, we first report the synthesis of benzoxazine monomer based on bisphenol-A as a phenolic source. Then we focus on the elaboration of nanocomposites, where the nanoscale boron carbide particles B 4 C were chosen as nanofillers within the PBz matrix.…”

Section: Introductionmentioning

confidence: 99%

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Exploring the potential of benzoxazine-based nanocomposites for lightweight neutron shielding applications

Abdous

Derradji

Mekhalif

et al. 2023

High Performance Polymers

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Given their substantial neutron capture cross-section, extreme hardness, and high chemical and thermal stability, boron-based materials are widely used as building blocks to protect against highly ionizing radiations such as gamma rays and neutrons. Indeed, uncontrolled nuclear radiation exposure can be highly hazardous to radiation workers and the general public. In this sense, this work presents an extensive study and experimental evaluation of the nuclear shielding features of boron carbide (B4C) based nanocomposite, where bisphenol-A based polybenzoxazine (BA-PBz) was used as matrix. The latter was used for its wide range of interesting properties that overcome some of the shortcomings of conventional phenolic resins. A two-pot synthesis process was adopted for the synthesis of (BA-Bz) monomer. Moreover, the boron carbide nanoparticles were treated with a silane (KH-560) coupling agent in order to improve the intramolecular interactions with the polymeric matrix. The neutron shielding studies were carried out at the Nuclear Research reactor of Algeria NUR. The results showed that the developed boron carbide-based nanocomposite exhibits intriguing shielding performances and good thermal stability. The highest performances were obtained at a B4C concentration of 5. wt %, where the macroscopic cross section was found to be (Σ = 3.3878 cm−1) with a screening ratio of (S = 97.78%).

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Section: Nuclear Radiation Shielding Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Exploring the potential of benzoxazine-based nanocomposites for lightweight neutron shielding applications

Abdous

Derradji

Mekhalif

et al. 2023

High Performance Polymers

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“…The screening or shielding ratio (S) and the mean free path (thickness to stop half of the original flux) can be calculated from the previous equation. Detailed equations can be found in our previous work [1,2].…”

Section: Neutron Shielding Testsmentioning

confidence: 99%

“…For instance, UHMWPE reinforced epoxy/boron carbide hybrid composites displayed remarkable performances against fast neutrons with a macroscopic cross-section of 0.188 cm −1 equivalent to a mean free path of 3.7 cm [1]. Similarly, against thermal neutrons a macroscopic cross-section of 0.313 cm −1 equivalent to a mean free path of 2.2 cm, was recorded [2]. It is also important to specify that boron particles were added because of their ability to absorb the energy of thermalized neutrons [3].…”

Section: Introductionmentioning

confidence: 97%

High Performance Dual Ballistic and Thermal Neutrons Shields From Kevlar Fibers Reinforced Epoxy/B4C Hybrid Composites

et al. 2022

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Targeting the development of advanced lightweight thermal and ballistic neutrons shields, a new hybrid composite was developed, for the first time, from Kevlar fibers, epoxy and boron carbide (B4C) particles. Kevlar fibers, as one of the strongest polymeric fillers, possess a high proportion of low Z atoms highly suitable for moderating neutrons. Meanwhile, these fibers can provide an additional efficient protection against high velocity projectiles. The B4C particles were added in various amounts, mainly for their excellent absorption of thermal neutrons. The nuclear shielding tests were performed at NUR research reactor using an optimized experimental setup. The obtained results confirmed the high shielding efficiency of all the developed materials. Meanwhile, the best performance was recorded at B4C amount of 20 wt.% with a macroscopic cross-section (Σ) of with a 3.638 cm−1 equivalent to a mean free path (λ) of 0.191 cm. The obtained results were compared with the most performant available shields and the data confirmed that superiority of the developed materials.

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Effects of solid lubricants on the tribological behavior of steel‐backed UHMWPE fabric composites

Lin

Guo

Yuan

2021

J of Applied Polymer Sci

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Aboard ship, the use of lubricating oil in mechanical equipment is sometimes difficult to achieve and applied oil can easily leak. The use of self‐lubricating materials can largely solve this problem. In this study, three kinds of solid lubricant‐enhanced 304 stainless steel‐backed ultrahigh molecular weight polyethylene (UHMWPE) fabric composites were fabricated with the addition of graphite, molybdenum (IV) disulfide, or polytetrafluoroethylene (PTFE). They were tested under various rotating speeds and compared with pure steel‐backed UHMWPE fabric composites. The tribological performance of these composites was evaluated by analysis of friction coefficient, wear rate, and worn face morphology. The results showed that PTFE‐enhanced composites exhibited the best friction reduction performance under all test conditions, better antiwear ability at rotating speeds under 200 rpm, and optimized wear surface morphology, thus indicating better synergy between PTFE and UHMWPE fabric.

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Outstanding thermal neutrons shields based on epoxy, UHMWPE fibers and boron carbide particles

Cited by 12 publications

References 17 publications

Exploring the potential of benzoxazine-based nanocomposites for lightweight neutron shielding applications

Exploring the potential of benzoxazine-based nanocomposites for lightweight neutron shielding applications

High Performance Dual Ballistic and Thermal Neutrons Shields From Kevlar Fibers Reinforced Epoxy/B4C Hybrid Composites

Effects of solid lubricants on the tribological behavior of steel‐backed UHMWPE fabric composites

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