Magnetic Field-Induced Orientation of Modified Boron Nitride Nanosheets in Epoxy Resin with Improved Flame and Wear Resistance

Abstract

In this work, self-lubricating boron nitride nanosheets (BNNs) were decorated with flame-retardant zinc ferrite (ZnFe2O4), followed by stearic acid modification to obtain magnetic and hydrophobic properties. Under the external magnetic field, the obtained ZnFe2O4–BNNs can be well ordered into one-dimensional orientation in the epoxy resin (EP) matrixenabling improved flame retardant properties. Compared to a randomly oriented ZnFe2O4–BNN equivalent, the well-orientated ZnFe2O4–BNNs (at 10% mass fraction) reduce the peak heat release rate and CO production by 47 and 51%, respectively. Furthermore, the ZnFe2O4–BNN/EP composite monoliths demonstrate excellent durability, displaying continued superhydrophobicity under Taber abrasion, high external pressure, knife scratch, long-term exposure to acids/bases, and harsh UV irradiation. In addition, the result shows that the well-oriented ZnFe2O4–BNN/EP composite demonstrates better tribological performance and the friction coefficient is reduced by 76.9%.

Recent advances of two-dimensional lubricating materials: from tunable tribological properties to applications

“…Additionally, hybrid h-BN composites involving ZnO or ZnFe 2 O 4 were also synthesized to lower the COF for lubrication applications. Shi et al 197 3.4 Other valuable lubricants 3.4.1 Nanomaterials with graphene-like structures. Given that 2D nanomaterials with hexagonal honeycomb lattice structures, including graphene, TMDs and h-BN, exhibit promising prospect as novel lubricating nanomaterials, other atomic-layered nanomaterials, such as graphite-like carbon nitride, MXenes, layered double hydroxides and single-element lamellar materials, have also attracted attention from researchers as advanced lubricants in different application circumstances.…”

“…Additionally, hybrid h-BN composites involving ZnO or ZnFe 2 O 4 were also synthesized to lower the COF for lubrication applications. Shi et al 197 investigated the mass fabrication and superior wear and friction resistance of multi-layer ZnFe 2 O 4 /h-BN nanocomposites. The loading of ZnFe 2 O 4 is the key to improve the super-flame retardancy and anti-friction properties of the multilayer h-BN, which also indirectly boosts magnetic and hydrophobic performance.…”

2D hexagonal boron nitride (h-BN) nanosheets in protective coatings: A literature review

“…A 10% ZnFe 2 O 4 - BNNSs - EP coating reduced the CO production and peak heat release rate by 51% and 47%, respectively, and provided surface superhydrophobicity. The coated surface reduced the friction coefficient by 76.9% [ 103 ]. BNNSs could act as a container to hold corrosion inhibitors to a certain extent facilitating a slow release [ 104 ].…”

3D Printing of Zirconia Nanoparticle/Boron Nitride Nanosheet Multidimensional Reinforced Acrylic Matrix Composites for Self-Lubricating Materials

“…Adding BNNs to the lubrication system can enhance the antifriction and antiwear properties of the friction pairs. , Lee et al employed BNNs to reinforce the Si 3 N 4 composite, which increased the fracture toughness and tribological properties of the composite by about 24.7 and 26.7%, respectively. Shi et al employed ZnFe 2 O 4 to modify BNNs to create a ZnFe 2 O 4 –BNNs/Epoxy composite, which exhibited a friction coefficient significantly lower than pure epoxy resin, by approximately 76.9%.…”