The Glass Produced from Recycled Soda-Lime Glass Cullet by Slip Casting

Abstract

Slip casting is a ceramic processing technique which can be used to produce complex-shape ceramic object. In the present work, slip casting was applied to produce the 70 mm × 10 mm × 15 mm green samples from recycled soda-lime glass. The slip with 60% solid loading was prepared from 100 g of recycled cullet, 1 g of sodium silicate as a binder, 50 ml of DI water, and 16.7 ml of deflocculant. The deflocculant for slip casting was 0.1 wt% sodium tripolyphosphate solution.  After slip casting, the samples were dried at room temperature for 3 days. Then the samples were sintered at 680, 700, and 720 °C with the soaking time of 1 and 2 hrs with 5 °C/min heating rate. The results from statistical analysis showed that there was a high variation on flexural strength which should be from the high closed porosity and high pore-size variation of the samples. Therefore, our glass produced from slip casting is not suitable for load bearing applications. However, this technique still can be used to produce other art products such as Buddha amulets.