Abstract

In this work, Soda Lime Glass (S.L.G.) powder was used ,as fluxe in traditional porcelain instead of feldspar. Two ceramics porcelain were compared; commercial or traditional porcelain that content of 50wt % kaolin, 25wt % quartz, and 25wt % feldspar. Feldspar mass was substituted by scraps soda lime glass yielding a new porcelain composition, to determine the softening points and then the effect of glass addition on porcelain firing process.
Eight samples, for each patch, were prepared and 8wt % water was added. The resulting composite blends were then die pressed at 2N, to produce disk specimens with diameter of 1.5 cm, and then they were sintered at (1000, 1100, 1200, 1250,1300,1350,1400 and 1450) ˚C, for 2 hours in an electric furnace with a digital controller. Physical parameters, such as density, water absorption, and shrinkage were measured. It was concluded that the sintering process and physical properties were improved by heat treatment. However, the firing results showed that the addition of S.L.G. replacing feldspar lowers the melting points of porcelain and the addition of scrap powder has a positive effect on the quartz dissolution.
The purpose of the present work is to replace 25wt% of feldspar by soda lime glass in a standard porcelain composition and evaluate their differences in physical properties at different firing temperatures.

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