YANG Liangliang 1, XIE Zhipeng 1,2, LI Shuang 2, SONG Ming 1
(1. Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China; 2. State Key Laboratory of New Ceramic and Fine Processing, Department of Materials, Tsinghua University, Beijing, 100084, China)
Abstract: Silicon nitride is an attractive structural material with high strength, high hardness, excellent wear and corrosion resistance. The gas pressure sintering method for silicon nitride ceramics can increase the sintering temperature and thus promote the densification; also it is suitable for the specimens with complicated shapes. Thus, the gas pressing sintering method is an economical and practical method for preparing silicon nitride ceramics. This paper reviewed the fundamental principle and technical procedures of gas pressure sintering. Then, the application of silicon nitride in the bearing, aerospace and other fields was summarized.
Key words: silicon nitride; gas pressure sintering; sintering aids; two-step sintering method