Boron nitride nanotubes as a reinforcement for brittle matrices |
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| Affiliation: | 1. Institute of Physics of Materials, Academy of Sciences of the Czech Republic, CEITEC IPM, ?i?kova 22, Brno, Czech Republic;2. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, Ko?ice, Slovak Republic;3. Materials Research Institute, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom;4. Nanoforce Technology Limited, Queen Mary University of London, London E1 4NS, United Kingdom;1. National Technical University of Ukraine “Kiev Polytechnic University”, 35 Polytechnichna str., Kiev 03056, Ukraine;2. Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, 3 Krzhyzhanovsky str., Kiev 03142, Ukraine;1. Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha 410083, PR China;2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR China;3. School of Physics and Electronics, Institute of Super-microstructure and Ultrafast Process in Advanced Materials, Central South University, Changsha 410083, PR China;1. Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, School of Materials and Chemical Engineering, Hainan University, 58 Renming Ave, Haikou 570228, China;2. School of Materials Science and Engineering, Donghua University, 160 North Renming Road, Songjiang District, Shanghai 200257, China;1. Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha 410083, PR China;2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR China;3. School of Physics and Electronics, Institute of Super-microstructure and Ultrafast Process in Advanced Materials, Central South University, Changsha 410083, PR China |
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| Abstract: | Cylindrical and bamboo-like boron nitride nanotubes (BNNTs) have been used to reinforce brittle amorphous borosilicate glass matrix materials prepared by spark plasma sintering. The mechanical properties, such as hardness, Young's modulus, fracture toughness, and scratch resistance of the materials have been investigated. The fracture toughness of the composites showed an improvement of ～30% compared to the pure amorphous glass. BNNTs pull-out, crack bridging, stretching, and crack deflection toughening mechanisms were observed in the reinforced glass matrix composites. Extensive pull-out of the BNNTs (>400 nm) was observed in the form of the telescopic “sword-in-sheath” mechanism, resulting in poor energy dissipation due to the weak Van der Waals force between the inner walls of the BNNTs. The scratch resistance was significantly improved (～26%) after the addition of the BNNTs, and the results correspond well with the brittleness index of the materials. |
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| Keywords: | Amorphous borosilicate glass Boron nitride nanotubes Composite Toughening mechanisms Scratch resistance |
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