Study of the Compacting and Pre-Sintering of Dental Zirconia Waste Powders
Handan Turan Matİk Mustafa Boz Ulaş MATİK
AbstractThis study aims to determine the optimum parameters for production of zirconia block from dental zirconia waste powders. For this purpose, zirconia blocks obtained by uniaxial pressing of waste powders under different pressures (200, 300, 400, 550 and 600 MPa) were pre-sintered at different temperatures (950, 1050, 1150 and 1250 °C) for 2 h. Pre-sintered zirconia blocks were characterized density and hardness tests. The phase structure and chemical composition of zirconia blocks were determined by SEM-EDX and XRD analysis. The density and hardness of zirconia blocks increased depending on increasing pressing pressure and pre-sintering temperature. Also, it has been found that high pressing pressures cause cracks in the blocks.