LEI Huicong 1, XIE Zhipeng 2
(1. School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, Jiangxi, China; 2. State Key Laboratory of New Ceramics and Fine Technology, School of Materials, Tsinghua University, Beijing 100084, China)
Abstract: The preparation technology of nano ceramics is an effective means to improve the brittleness and toughness of ceramics. Composite technology and sintering process are important for the preparation of nano ceramics. The uniform dispersion of nano ceramic composite powder is the prerequisite for the preparation of nano ceramics. At present, the most widely applied dispersion and composite technology mainly include liquid phase mixing and chemical wrapping. Advanced sintering technologies, such as spark plasma sintering, hot pressing sintering, oscillating pressure sintering, two-step sintering and hot isostatic pressing sintering, are often used to inhibit grain growth. The development progress, classification and toughening mechanism of nano ceramics are reviewed. With selected examples, the dispersion and sintering technology are summarized. Meanwhile, the microstructure and properties of nano ceramics prepared by different dispersion and sintering technologies are analyzed and overved.
Key words: nano ceramics; dispersion technology; sintering process; grain size; mechanical properties