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.
参考文献
| [1] | Chen Yitao;Wu Fengying;Yan Dongsheng et al.Influence of hot press process of Si3N4 and interfacial crystallization on the microstructure and properties[J].Journal Chin Silicate Soc(in Chin),1982,10(02):129. |
| [2] | Bao Yiwang .Evaluation on brittleness and impact resistance of structural ceramics[J].Nuclear Engineering and Design,1994,150:323. |
| [3] | Bao Yiwang .Fatigue characteristics and lifetime expectation of Al2O3, Si3N4 and SiC[J].Journal Chin Silicate Soc(in Chin),2001,29(01):21. |
| [4] | Chen Hongguang;Sun Weiying .Effect of rare earth oxides on the densification and mechanical properties of β-SiAlON ceramics[J].无机材料学报,1998,13(01):33. |
| [5] | Taiil M;Mazdi K S;Robert R .The Role of Cerium Orthosilicate in the Densification of Si3N4[J].Journal of the American Ceramic Society,1979,62(1-2):12. |
| [6] | Wang Peiling;Werner Pereric;Gao Lian et al.Ordering of nitrogen and oxygen in nitrogen-containing melilites Y2Si3O3N4 and Nd2Si2.5Al0.5O3.5N3.5[J].Journal of Materials Chemistry,1997,7(10):2127. |
| [7] | Su Shengbiao .Relationship Between the Structure and Mechanical Properties of Silicon Nitride Ceramic[D].Guangzhou, China: South China University of Science and Technology,1989. |
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