Lightweight dense/porous bi-layered ceramic tiles prepared by double pressing
authors Novais, RM; Seabra, MP; Labrincha, JA
nationality International
journal JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
author keywords Pressing; Porosity; Mechanical properties; Ceramic tiles; Functional applications
keywords MINIMUM SOLID AREA; PORCELAIN STONEWARE; TENSILE-STRENGTH; POROSITY
abstract This work reports the production process of bi-layered ceramics tiles, formed from two layers with different densities - dense and porous - and with adjustable thickness. The novel production method comprises a double pressing action, fast and easy to implement industrially, that ensures the development of a perfect interface bonding between layers. The bi-layered ceramic tile is formed by an upper layer with density similar to a conventional porcelain stoneware tile, and a porous bottom layer, which promotes weight reduction of the product maintaining suitable mechanical strength. The introduction of porosity is achieved by means of the incorporation of pore forming agent - polypropylene (PP) - into the ceramic formulation, which undergoes complete and non-harmful thermal decomposition during firing. For comparison, polymethyl methacrylate (PMMA) was also tested as porogen. The rapid and complete combustion of PP is suitable for fast-firing ceramic products, such as porcelain stoneware. In addition, the polymer decomposition does not induce defects in the ceramic pieces, and is environmentally acceptable. The produced tiles are lighter than conventional porcelain stoneware tiles, thus decreasing their transport and distribution costs. Additionally, the thermal attenuation provided by the porous layer could be valuable in innovative applications, such as ventilated facades. (C) 2014 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0924-0136
year published 2015
volume 216
beginning page 169
ending page 177
digital object identifier (doi) 10.1016/j.jmatprotec.2014.09.010
web of science category Engineering, Industrial; Engineering, Manufacturing; Materials Science, Multidisciplinary
subject category Engineering; Materials Science
unique article identifier WOS:000347020800018
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journal impact factor (jcr 2016): 3.147
5 year journal impact factor (jcr 2016): 3.372
category normalized journal impact factor percentile (jcr 2016): 82.576
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