앵커용 알루미나 세라믹의 기계적 강도에 대한 MgO 첨가제와 소결온도 영향

The sintering process in alumina (Al2O3) specimens for a functional ceramic anchor was investigated and the physical and mechanical properties of the sintered samples were analyzed. MgO (from 0.25 wt% to 3.0 wt%) as an additive was added and sintered at various temperatures (1450 ℃, 1550 ℃, and 1650 ℃) using a conventional solid state sintering process. The sintered density, flexural strength and compressive strength were investigated for the mechanical strength evaluation. The 2.0 wt% MgO added Al2O3 samples (sintered at 1650 ℃) showed a maximum flexural strength of 354.82 MPa and compressive strength of 1615.2 MPa. These experimental results suggested that the sintering temperature and the amount of additives played an important role in enhancing the density and mechanical strength because of the micro-structure modification by MgO addition in the Al2O3 sintered samples. We expect to be able to produce ceramic anchors using the experimental conditions with the best mechanical and physical properties.