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Low-Carbon Carbon-Bonded Alumina Refractories for Functional Components in Steel Technology

V. Stein, C. G. Aneziris

Technische Universität Bergakademie Freiberg Institut für Keramik, Glas- und Baustofftechnik, Agricolastrasse 17, 09599 Freiberg, Germany

received November 3, 2013, received in revised form January 3, 2014, accepted February 5, 2014

Vol. 5, No. 2, Pages 115-124   DOI: 10.4416/JCST2013-00036

Abstract

Carbon-bonded alumina refractories (Al₂O₃-C) are essential for modern steelmaking practice. The typical carbon content for functional materials is approximately 30 wt%. With regard to environmentally friendly refractory systems, this work has observed and described the interaction of functional silicon (n-type semiconductor) with an organic binder system. With this system, it was possible to lower the carbon content to 15 wt% without downgrading the material properties. On the contrary, the properties were improved. As a result of the upgrading of the microstructural flexibility and the mechanical strength, the thermal shock performance could be enhanced. The mechanism is based on electron transfer from the n-type semiconductor to the binder resite lattice. The result is a flexible, partially graphitized carbon bonding matrix. This aspect had been studied previously in a CaO-MgO-C system and is of great interest with regard to reduced emissions and environmentally friendly refractory materials.

Keywords

Alumina, graphite, electron transfer

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