Liquid phase sintering (LPS) and dielectric constant of α-silicon nitride ceramic

Abstract

The spark plasma sintering (SPS) was applied to prepare α-Si₃N₄ ceramics of different densities with magnesia, silicon dioxide, alumina as the sintering aids. The mechanism of liquid phase sintering (LPS) was discussed and the factors influencing the density of the prepared samples were analyzed. The dielectric constant of sintered samples was tested. The experimental results show that the density can be controlled from 2.48 g/cm³ to 3.09 g/cm³ while the content of the sintering aids and the sintering temperature alter and the dielectric constant is closely dependent on the density of obtained samples.

Keywords

liquid phase sintering (LPS) / spark plasma sintering (SPS) / α-silicon nitride / sintering aids / dielectric constant

References

[1] Riley F L. Silicon Nitride and Related Materials [J]. Journal of American Ceramic Society, 2000, 83(2): 245-265.

[2] W Dave Carruthers, Paul F Becher and Mattison K Ferber. Advances in the Development of Silicon Nitride and Other Ceramics [C].In: Proceedings of ASME Turbo Expo., 2002, Amsterdam, The Netherlands

[3] K Komeya. Progress in Silicon Nitride Ceramics in Japan [C].In: Silicon Nitride-Scientific and Technological Advances, I W Chen Ed., MRS Symposium Proceedings 287 MRS, Pittsburgh USA, 1993, 29

[4] Zhiyong Huang, Xuejian Liu, Liping Huang, . Pressless Sintering of Silicon Nitride Ceramics with Mg−Al−Si System Additives as Fluxing Agent [J]. Journal of Chinese Ceramic society, 2004, 32(2): 139-143.

[5] J Barta, M Manela. Preparation and Properties of Silicon Nitride for Radome Applications [J].In: Proceedings of the 16th Symposium on Electromagnetic Windows, 1982: 87–92

[6] Tokita M. Trends in Advanced SPS Spark Plasma Sintering Systems and Technology [J]. J. Soc. Powder Tech. Japan, 1993, 30: 790-804.

[7] Nishimura T, Mitomo H, Kawahara M. Fabrication of Silicon Nitride Nano-ceramics by Spark Plasma Sintering [J]. J. Mater. Sci. Lett., 1995, 14: 1046-1047.

[8] KA Khor, KH Cheng, LG Yu, F Boey. Thermal Conductivity and Dielectric Constant of Spark Plasma Sintered Aluminum Nitride [J].Materials Science and Engineering, 2003: 300–305

[9] Ruixia Shi, Yansheng Yin. Effects of Sintering Aids on Microstructure and Properties of Silicon Nitride Ceramics [J]. Modern Technical Ceramics, 2003, 97(3): 7-11.

[10] Lijian Yuan, Dongsheng Yan, Zhiqiong Mao. Mechanism of Sintering Silicon by Hot Pressing at Low Temperature [J]. Journal of the Chinese Ceramic Society, 1989, 17(6): 530-536.