Boron Nitride Nanotube Reinforced Composites
Comparison between Boron Nitride Nanotubes (BNNT) and Carbon Nanotubes (CNT)
Boron nitride nanotubes (BNNTs), which are structural analogs of carbon nanotubes (CNTs), possess remarkable mechanical properties similar to CNTs with strength reaching 60 GPa but with superior high-temperature endurance of ~900°C, higher resistance to oxidation at elevated temperatures, enhanced biocompatibility, chemical stability and radiation shielding properties. These benefits position BNNTs as emerging nanomaterials for applications, especially subjected to high temperatures and harsh environments. The research at PFL seeks to integrate BNNT in light weight structural metals (Aluminum, Magnesium and Titanium matrices), polymers as well as ceramics to enhance their multi-functional properties. The growing interest in BNNT-reinforced composites can be demonstrated in the form of patents by the PFL group.
Advanced and conventional manufacturing techniques including spark plasma sintering, high strain rate deposition, ultrasonic cavitation, additive manufacturing, etc. are being adopted to fabricate BNNT-reinforced composites. In-situ mechanical techniques are being employed for real-time examination of strengthening mechanisms in these nanocomposites.
Beyond the engineering opportunities, there are also exciting fundamental questions. They relate to the nature of the complex dislocation, amorphization, and mechanical alloying mechanisms upon straining and their relationship to the enormous strength. Studying these mechanisms is enabled by mature atomic-scale characterization and simulation methods. A better understanding of the extreme strength in these materials also provides insight into modern alloy design based on complex solid solution phenomena.
Comparison between Boron Nitride Nanotubes (BNNT) and Carbon Nanotubes (CNT
Enhancement in mechanical properties with the reinforcement of BNNTs in Aluminum