Boron nitride nanotubes as a reinforcement for brittle matrices

0434893 - ÚFM 2015 RIV GB eng J - Journal Article
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
R&D Projects: GA MŠMT(CZ) ED1.1.00/02.0068
EU Projects: European Commission(XE) 264526 - GLACERCO
Institutional support: RVO:68081723
Keywords : Amorphous borosilicate glass * Boron nitride nanotubes * Composite * Toughening mechanisms * Scratch resistance
Subject RIV: JH - Ceramics, Fire-Resistant Materials and Glass
Impact factor: 2.947, year: 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.
Permanent Link: http://hdl.handle.net/11104/0238867