Solicitante: TUBITAK-TURKIYE BILIMSEL VE TEKNOLOJIK VE ARASTIMA KURUMU
N. de publicación: ES2357521 T3
The subject of the present invention is manufacturing alkaline lead frits containing tin dioxide (SnO 2 ), having low lead solubility and representing antique tile glazes. According to the invention, this frit may be produced easily by mixing alkaline components, lead oxide, tin dioxide and a silica source, melting materials together and it is poured directly into cold water to make it easily grinding. The recipe of the produced frit is; 0-5 % dolomite, 20-25 % sodium bicarbonate, 0-3 % potassium carbonate, 5-7 % colourless glass cullet, 25-30 % red lead, 1-5 % tin dioxide and 30-40 % silica source. CoO is added to the mixture to provide a light bluish appearance to transparent, colourless and glassy properties of frit. The homogenous mixture is melted at 1000-1250 DEG C for 3,5 h.; The thermal expansion coefficient of the frits is in the range of 10-15×10 -6 / DEG C at 20-500 DEG C, Tg point (glass transition temperature) and Tm point (melting point) are in the range of 450-465 DEG C and 550-565 DEG C respectively. Lead solubility values of these frits and glazes prepared by using these frits are as 0,2 mg/dm 2 . Vickers micro hardness values of produced frits are between 4,9-5,9 GPa. Tin dioxide (SnO 2 ) containing frit can be used in glazes, which are compatible with antique like tile glazes (Iznik tiles) and compose 90 to 99 % by weight of the glaze mixture. The optimal firing temperature and dwell time for the glaze prepared from this frit is 900-960 DEG C and 0-45 min. Tin dioxide (SnO 2 ) containing lead alkaline frit can be used in manufacturing of antique like tiles and glazes of lead safe solubility values.
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