Due to the increasing trend in the use of olivine, in this study, mixtures were prepared by adding Y₂O₃ at the rates of 1, 2.5, 5, 10 and 20 percent by weight to olivine obtained from a facility and these mixtures were gradually sintered at temperatures of 1100, 1200, 1300, 1400, 1450 and 1500 °C for 3 hours. The findings showed that Y₂O₃ additives improved the mechanical properties of olivine. The effect of the interphase observed in the microstructure of composite structures increased the strength by reducing the glassy phase and caused grain thinning. The best results in each group studied were achieved at the sintering temperature of 1400ºC, and it was observed that these values ​​decreased at temperatures above this. It was observed that the reason for this decrease was due to increasing average grain size and crack formation in the microstructure.