Effect of Addition of Amorphous Glass (Soda Lime Glass) on Sintering Process and Properties of Alumina Ceramics

Abstract

The composition of amorphous glass was varried such as 0, 5 and 10 % wt. also temperature of sintering was varried from 1200 to 1400 °C. The γ-Al 2 O 3 powder (p.a) and amorphous glass from soda lime glass were mixed and milled by using a ball mill for 24 hours, and then dried at 100 deg.C. Then, the dried powders were mixed with 2 % PVA as a binder, then, the powders ware put into a dies mold and pressed with a pressure of 40 MPa. The pellet samples were sintered by using electrical furnace Thermolyne with heating rate 10°C/minute and holding time at each sintering temperature for 2 hours. The characterization of the sintered sample was done such as measurement of density, porosity, vickers hardness, and analysis of crystal structure. The characterization results show that the highest density value of 3.36 g/cu.cm and the lowest porosity value of 1.06 % obtained at 1400 °C sintering temperature with 10% additive. While the samples without additive have density value about 2.37 g/cu.cm and its porosity value about 20% at 1400 °C sintering temperature. Similarly, the highest hardness value was achieved at 775 Hv on samples with 10% additive and sintering temperature of 1400 °C. The XRD analysis showed that samples with SiO2 additive up to 10% did not cause reaction and did not cause new phase. The phase that appears only the corundum phase (α-Al 2 O 3 ). The sintering process of Alumina Ceramic the presence of SiO 2 additive can be accelerated with lower temperatures.