Toughening effect of multi-walled boron nitride nanotubes and their influence on the sintering behaviour of 3Y-TZP zirconia ceramics

0434892 - ÚFM 2015 RIV GB eng J - Journal Article
Tatarko, Peter - Grasso, S. - Chlup, Zdeněk - Porwal, H. - Kasiarova, M. - Dlouhý, Ivo - Reece, M.J.
Toughening effect of multi-walled boron nitride nanotubes and their influence on the sintering behaviour of 3Y-TZP zirconia ceramics.
Journal of the European Ceramic Society. Roč. 34, č. 7 (2014), s. 1829-1843. ISSN 0955-2219. E-ISSN 1873-619X
EU Projects: European Commission(XE) 264526 - GLACERCO
Institutional support: RVO:68081723
Keywords : Zirconia * Boron nitride nanotubes * Composite * Spark plasma sintering * Toughening mechanism
Subject RIV: JI - Composite Materials
Impact factor: 2.947, year: 2014

Different amounts (0.5, 1, 2.5 and 5 wt%) of hollow “cylindrical” and “bamboo-like” boron nitride nanotubes (BNNTs) have been used to reinforce 3Y-TZP zirconia ceramics via spark plasma sintering. No significant influence of different morphologies of BNNTs on the mechanical properties at the macro-scale (elastic modulus, hardness, and fracture toughness) has been observed. The fracture toughness increased continuously with the increasing amount of the BN nanotubes up to 2.5%, resulted in the improvement of 100% compared to the reference ZrO 2 . A direct influence of BNNTs on the toughening of ZrO 2 has been recognized. The BNNTs strengthen the zirconia grain boundaries resulting in the alteration in fracture mode from inter- to trans-granular. The BNNTs also promoted the transformation toughening of zirconia. Their influence on the bridging and pull out has been confirmed by the investigation of the composites with the amorphous borosilicate matrix.
Permanent Link: http://hdl.handle.net/11104/0238866