Stability Examination of the New Inclusion pigments in the Ceramic Glazes

A common problem in the ceramic tile industry is the hue variation between the products that not only impairs the product appearance but also increases stock management costs, and is prejudicial to product competitiveness. This hue variation can be caused by process variables as, i.e. pigment preparation conditions that affect the pigments physical and chemical properties. The determination of the hue variation in glazed tiles can be obtained by the analysis of the reflectance curves and the L*, a*, b* parameters provide by a spectrophotometer. The analysis of the physical interactions between pigments, and glazes is fundamental to understand the optical behavior of ceramic glazes. In this work Inorganic nanocomposite inclusion pigments of the SiO2 - Fe2O3 – ZrSiO4 and SiO2 - Fe2O3 systems were prepared using the Sol-Gel and coprecipitation methods [3, 5]. A constant 5 weight percent of the synthesis pigments was added to the several kinds of ceramic glazes such as monoprosa, borates, alkalis (high sodium), etc. all of the colored glazes were formulated by required amount of the kaolin and additives, then wet milling for 20 minutes, after the air brushing on the conventional wall tiles, they were dried at 110°C for 2 hours and fired at 1100°C in an electrical furnace with a soaking time of 10 minutes, heating rates were 20°C per minute. In order to determine the effects of the glaze formulation on the stability of the nanocomposite pigments and to define the color developed by the samples, a Gretag Macbeth, Color-Eye 7000, was used, employing a 10° Standard Observer. The microstructures were characterised using scanning electron microscopy (Philips XL-30) Keywords: Color; Spectroscopy; Optical properties; ceramic glazes; Inclusion

کلیدواژه ها:

Inclusion ، pigment ، Ceramic