Effect of Y2O3, CeO2 on Sintering Properties of Si3N4 Ceramics
来源期刊：JOURNAL OF RARE EARTHS2003年第3期
论文作者：王黎 苏盛彪 李竟先 包亦望
Key words：additive; Si3N4 ceramics; sintering properties; rare earths;
Abstract: The effect of rare earth oxides Y2O3 or CeO2 on sintering properties of Si3N4 ceramics was studied and the mechanism of assisting action during sintering was analyzed. The results indicate that the best sintering properties appear in Si3N4 ceramics with 5% Y2O3 or 8% CeO2. Secondary crystallites are formed at grain boundaries after heat treatment, which decreases the amount of glass phase and contributes to the improvement of high-temperature mechanical properties of silicon nitride.
王黎1，苏盛彪1，李竟先2，包亦望1
(1.Key Laboratory for Advanced Ceramics, China Building Material Academy, Beijing 100024, China;
2.Department of Materials Science, South China University of Science and Technology, Guangzhou 510641, China)
Abstract:The effect of rare earth oxides Y2O3 or CeO2 on sintering properties of Si3N4 ceramics was studied and the mechanism of assisting action during sintering was analyzed. The results indicate that the best sintering properties appear in Si3N4 ceramics with 5% Y2O3 or 8% CeO2. Secondary crystallites are formed at grain boundaries after heat treatment, which decreases the amount of glass phase and contributes to the improvement of high-temperature mechanical properties of silicon nitride.
Key words:additive; Si3N4 ceramics; sintering properties; rare earths;
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