Boron nitride nanotubes as a reinforcement for brittle matrices

0434893 - ÚFM 2015 RIV GB eng J - Článek v odborném periodiku
Tatarko, Peter - Grasso, S. - Porwal, H. - Saggar, Richa - Chlup, Zdeněk - Dlouhý, Ivo - Reece, M.J.
Boron nitride nanotubes as a reinforcement for brittle matrices.
Journal of the European Ceramic Society. Roč. 34, č. 14 (2014), s. 3339-3349. ISSN 0955-2219. E-ISSN 1873-619X
Grant CEP: GA MŠMT(CZ) ED1.1.00/02.0068
GRANT EU: European Commission(XE) 264526 - GLACERCO
Institucionální podpora: RVO:68081723
Klíčová slova: Amorphous borosilicate glass * Boron nitride nanotubes * Composite * Toughening mechanisms * Scratch resistance
Kód oboru RIV: JH - Keramika, žáruvzdorné materiály a skla
Impakt faktor: 2.947, rok: 2014

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.
Trvalý link: http://hdl.handle.net/11104/0238867