Exceptionally strong boron nitride nanotube aluminum composite interfaces

Boron Nitride Nanotubes Toughen Silica Ceramics

“…The substantial contribution of the microstructural changes revealed here is in part because of the relatively low reinforcing efficiency from the interfacial load transfer, resulting in a transferred nanotube stress (∼1.2 GPa) of only a small fraction of the ultimate stress level (∼30.2 GPa) obtained from single-nanotube pullout measurements. 14,24 Therefore, the strengthening of the ceramic by the interfacial load transfer remains a primary reinforcing factor, provided that the interfacial load transfer on the nanotube-matrix interface can be at least modestly improved. Even though the effect of the added BNNTs on the composite's bulk mechanical properties via the induced microstructure change has been reported qualitatively in prior studies, 26,27 this study is among the first to provide a more quantitative assessment of this effect.…”

BNNT vs. CNT: influence of structural defects on damping characteristics of nanocomposites

“…[10][11][12][13][14][15] Conversely, the advantage of the intrinsically poor characteristics of the interface between the CNTs and matrix is that they can be used to improve the damping characteristics of the nanocomposites through efficient energy dissipation. [16][17][18] In general, the interfacial load transfer capability of pristine-BNNTs is superior to that of CNTs, particularly for surrounding matrices such as SiO 2 , 19,20 Al 2 O 3 , 21 polymethyl methacrylate (PMMA), [22][23][24] epoxy, 23 and natural rubber. 25 Although the hybridisation of C-C bonds in CNTs using intrinsic or designed defects improves their elasticity, only few studies have been devoted to defect engineering in BNNTs.…”

“…Similar conclusions that were previously reported suggested that BNNTs can form a more effective interface with hydrocarbon-based engineering polymers. [21][22][23][24][25][26] The introduction of vacancies and oxidation defects in BNNT served to improve the transverse damping characteristics of the nanocomposites, whereas their elasticity deteriorated. A comparison of the loss tangent of BNNT-reinforced composites at different frequencies revealed no clear difference in the extent to which B and N vacancies tailored the damping properties of nanocomposites.…”

“…In general, the interfacial load transfer capability of pristine-BNNTs is superior to that of CNTs, particularly for surrounding matrices such as SiO 2 , 19,20 Al 2 O 3 , 21 polymethyl methacrylate (PMMA), 22–24 epoxy, 23 and natural rubber. 25 Although the hybridisation of C–C bonds in CNTs using intrinsic or designed defects improves their elasticity, only few studies have been devoted to defect engineering in BNNTs.…”

“…Similar conclusions that were previously reported suggested that BNNTs can form a more effective interface with hydrocarbon-based engineering polymers. 21–26…”