Abstract: The microstrictural development of the ZrO2-2～20mol%Y2O3 ceramis heat ireated by tarious processes wore investgated by means of TEM、XRD and EPMA. The results show that, firstly, the fine-grained pure tetragonal zirconis polyorystals (TZP) were developed in low Y2O3 content samples(2mol%Y2O3), secondly, anti-phase domain boundaries with twin-like plate structure was obtained in 3~7.5mol%Y2O3 samples cooled rapidly from high temperature, thirdly, the partially stabilized zirconia (PSZ) with “tweed” structure and “colony” structure were developed in 4~6mol%Y2O3 samples annealed at c + t two phase region for long periods of time, in which the tetragonal particles precipitated from cubic matrix, and finally, the fully stabilized zirconia (FSZ) were obtained in 14 and 20mol%Y2O3 samples.

Key words: 陶瓷, 显微组织, 相变, 氧化锆