采用共沉淀法分别制备Al₂O₃和TiO₂前驱体包覆MgO颗粒，并在1 450℃保温2 h得到MgO基陶瓷，研究了Al₂O₃和TiO₂添加量对陶瓷物相组成、烧结性能和抗热震性能的影响。结果表明：添加Al₂O₃后，陶瓷的主要物相为方镁石相和MgAl₂O₄相，随Al₂O₃添加量的增加，MgAl₂O₄相含量增多，线收缩率和热震次数均先增后降，体积密度则增大；添加TiO₂后，陶瓷的主要物相为方镁石相、Mg₂TiO₄相和MgTiO₃相，随TiO₂添加量的增加，Mg₂TiO₄和MgTiO₃相含量增多，线收缩率和体积密度均先增后降，热震次数则先增加后保持稳定；当Al₂O₃和TiO₂的质量分数分别为6%，4%时，陶瓷的烧结性能和抗热震性能均最佳。

MgO particles coated with Al₂O₃ and TiO₂ precursors, respectively, were prepared by coprecipitation method and sintered at 1 450℃ for 2 h, and then the MgO-based ceramics were obtained. The effects of the addition amount of Al₂O₃ and TiO₂ on the phase composition, sintering performance and thermal shock resistance of the ceramics were investigated. The results show that the ceramics added with Al₂O₃ mainly consisted of periclase and MgAl₂O₄ phases. With increasing Al₂O₃ addition amount, the MgAl₂O₄ phase content increased, the linear shrinkage rate and the number of thermal shock cycles first increased and then decreased, and the bulk density increased. The ceramics added with TiO₂ was mainly composed of periclase, Mg₂TiO₄ and MgTiO₃ phases. With increasing TiO₂ addition amount, the content of Mg₂TiO₄ phase and MgTiO₃ phase increased, the linear shrinkage rate and bulk density first increased and then decreased, and the number of thermal shock cycles first increased and then remained stable. When the mass fractions of Al₂O₃ and TiO₂ were 6%, 4%, respectively, both the sintering performance and thermal shock resistance of the ceramics were the best.