Original scientific paper
Properties of Aluminosilicate Refractories with Synthesized Boron-Modified TiO2 Nanocrystals
Claudia Carlucci
; Chemistry Department, University of Bari, Bari, Italy
Francesca Conciauro
; National Nanotechnology Laboratory (NNL), Nanoscience Institute—CNR, Lecce, Italy
Barbara Federica Scremin
; National Nanotechnology Laboratory (NNL), Nanoscience Institute—CNR, Lecce, Italy
Antonio Graziano Antico
; National Nanotechnology Laboratory (NNL), Nanoscience Institute—CNR, Lecce, Italy
Marco Muscogiuri
; Department of Engineering for Innovation, University of Salento, Lecce, Italy
Teresa Sibillano
; Institute of Crystallography—CNR, Bari, Italy
Cinzia Giannini
; Institute of Crystallography—CNR, Bari, Italy
Emanuela Filippi
; Department of Engineering for Innovation, University of Salento, Lecce, Italy
Caterina Lorusso
; Department of Engineering for Innovation, University of Salento, Lecce, Italy
Paolo Maria Congedo
; Department of Engineering for Innovation, University of Salento, Lecce, Italy
Giuseppe Ciccarella
; National Nanotechnology Laboratory (NNL), Nanoscience Institute—CNR, Lecce, Italy
Abstract
An efficient microwave supported synthesis, with a reaction time of only one and a half minute, to prepare boron-modified titania nanocrystals TiO2:(B), was developed. The nanocrystals were obtained by hydrolysis of titanium tetraisopropoxide (TTIP) together with benzyl alcohol and boric acid, and the approach did not need surfactants use and a final calcination step. The produced TiO2:(B) nanocrystals were characterized in detail by low magnification Transmission Electron Microscopy (TEM), Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES), X-Ray Diffractometry (XRD), and a Micro Raman Spectroscopy. One of the obtained samples was then tested as an additive in various amounts in a typical aluminosilicate refractory composition. The effects of these additions in bricks were evaluated, according to UNI EN 196/2005, in terms of thermo-physical and mechanical properties: diffusivity, bulk density, apparent density, open and apparent porosity and cold crushing strength. Bricks’ microstructure was analysed by Scanning Electron Microscopy (SEM) and energy dispersion spectroscopy (EDS). The bricks obtained with nanoadditives presented improved mechanical characteristics with respect to the typical aluminosilicates, presumably because of a better compaction during the raw materials’ mixing stage.
Keywords
TiO2; anatase; boron; aluminosilicate; nanocrystals; refractories
Hrčak ID:
142437
URI
Publication date:
1.1.2015.
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