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Bilecik, Turkey

Kayaci K.,Termal Seramik Sanayi Ltd. | Ozdamar S.,Technical University of Istanbul | Kucuker A.S.,Anadolu University | Esenli F.,Technical University of Istanbul | Uz B.,Technical University of Istanbul
Industrial Ceramics | Year: 2010

The aim of this study is to determine the properties of metarhyolites from llgin-Konya (Turkey) area and to decide whether or not metarhyolites are suitable as a flux agent for porcelain stoneware tile production. For this aim, the chemical and mineralogical properties of metarhyolite were determined by chemical analyses, XRD and SEM studies. Starting from the reference mix composition, different amounts 4, 8, 12 and 16 wt.% of potassium feldspar were replaced with the same amounts of metarhyolite. All the samples were fired under industrial conditions at 1 200 °C for 49 min. The physical and mechanical properties of the fired porcelain stoneware bodies such as water absorption, linear shrinkage, bulk density and fired flexural strength were measured. Fired bodies were subjected to colour measurements and X-ray diffraction (XRD). The results indicate the possible use of metarhyolite as an effective fluxing agent in porcelain tile bodies. Source

Yavuz O.,Technical University of Istanbul | Kayaci K.,Termal Seramik Sanayi Ltd. | Kucuker A.S.,Termal Seramik Sanayi Ltd. | Ozdamar S.,Technical University of Istanbul | And 5 more authors.
Industrial Ceramics | Year: 2011

Agacli-Kemerburgaz area, NW of Istanbul, is one of the most important underclay deposits of Turkey. This area is composed of Paleozoic sedimentary sequence, Upper Cretaceous volcanic rocks, Neogene sediments and Quaternary alluvium deposits. The calc-alkaline volcanic rocks are the parent rocks of the underclays in this area. In this work, mineralogical and chemical analyses and relevant technological tests were conducted in order to assess the potential of selected underclays of this region. The technological properties were characterized by firing shrinkage, water absorption and breaking strength after firing. The chemical analyses generally showed the characteristics of typical kaolinized materials. Underclays containing (up to 33 wt. %) porcelain stoneware formulations were prepared and standard tests were applied to the porcelain tiles after single fast firing under industrial conditions. The densification behaviour and phase evolution of the bodies upon firing were evaluated. Physical, thermal and optical properties and chromatic coordinates were also measured. The results revealed that it was possible to employ the underclays to replace more expensive clay in porcelain tile production without deterioration of the required properties. Source

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