Al/Al2O3 metal matrix composites produced using magnetic field-assisted freeze-casting of porous ceramic structures

Bakkar, Said; Wall, Michael T.; Ku, Nicholas; Berman, Diana; Aouadi, Samir; Brennan, Raymond E.; Young, Marcus L.

doi:10.1557/s43578-021-00159-9

Cited by 7 publications

(1 citation statement)

References 45 publications

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“…Thus, more sophisticated designs are necessary to attain improved thermal insulation performance. In this regard, many strategies have been introduced to regulate micro-architecture designs in the freeze-casting process, such as wettability control 13 , temperature gradient direction 28 , 29 , additive modification 30 , 31 , magnetic field assistion 32 , and interface design 33 , 34 .…”

Section: Introductionmentioning

confidence: 99%

Large-scale assembly of isotropic nanofiber aerogels based on columnar-equiaxed crystal transition

Li,

Zhou,

Gao

et al. 2023

Nat Commun

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Ice-templating technology holds great potential to construct industrial porous materials from nanometers to the macroscopic scale for tailoring thermal, electronic, or acoustic transport. Herein, we describe a general ice-templating technology through freezing the material on a rotating cryogenic drum surface, crushing it, and then re-casting the nanofiber slurry. Through decoupling the ice nucleation and growth processes, we achieved the columnar-equiaxed crystal transition in the freezing procedure. The highly random stacking and integrating of equiaxed ice crystals can organize nanofibers into thousands of repeating microscale units with a tortuous channel topology. Owing to the spatially well-defined isotropic structure, the obtained Al2O3·SiO2 nanofiber aerogels exhibit ultralow thermal conductivity, superelasticity, good damage tolerance, and fatigue resistance. These features, together with their natural stability up to 1200 °C, make them highly robust for thermal insulation under extreme thermomechanical environments. Cascading thermal runaway propagation in a high-capacity lithium-ion battery module consisting of LiNi0.8Co0.1Mn0.1O2 cathode, with ultrahigh thermal shock power of 215 kW, can be completely prevented by a thin nanofiber aerogel layer. These findings not only establish a general production route for nanomaterial assemblies that is conventionally challenging, but also demonstrate a high-energy-density battery module configuration with a high safety standard that is critical for practical applications.

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