Pressureless Sintering and Properties Investigation of Silicon Nitride

Abstract:

Different grain size of starting powder was choosed and different sintering additives were used to fabricate Si3N4 ceramics by pressureless sintering. Samples’ relative density and mechanical properties including Vickers hardness, bending strength and fracture toughness were tested. Then XRD, SEM and EDS were carried out to identify phase and observe microstructure and fracture morphology. The result shows that high purity α phase Si3N4 powder of 5 μm is suitable for sintering and combination of 5 wt.% MgO +5 wt.% Y2O3 is most effective within six kinds of sintering aids.

• Periodical: Advanced Materials Research (Volumes 194-196)
• Pages: 1464-1469
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.194-196.1464
• Online since: February 2011
• Authors: Bin Li, Yi Feng, Hui Qiang Liu, Yan Fang Zhu, Dong Bo Yu, Xue Bin Zhang, Xiao Bing Pan, Jing Tu, Xiao Ping Ouyang, Liang Zhi Cao, Hong Chun Wu
• Keywords: Mechanical Property, Pressureless Sintering, Silicon Nitride, Sintering Additive, Starting Powder

References

[1] Jack and K. H.: Mater. Sci. Vol. 11 (1976), p.1135.

[2] Pavol Sajgalik and Miroslav Haviar: Ceramics International Vol. 18 (1992), p.279.

[3] Zafer Tatli and Derek P. Thompson: Journal of the European Ceramic Society Vol. 27 (2007) p.791.

[4] Yingfeng Shao, Dechang Jia and Boyang Liu: Journal of the European Ceramic Society 29 (2009) p.1529.

[5] Yokota, H. and Ibukiyama M.: Journal of the European Ceramic Society Vol. 23 (2003), p.55.

[6] Hwang, C. J., Tien, T. -Y.: Mater. Sci. Forum, Vol. 47 (1989), p.84.

[7] Yang Haitao, Yang Guotao and Yuan Runzhang: Materials Chemistry and Physics Vol. 57 (1998), p.178.

[8] H. Bjorklund, L. K. L. Falk, K. Rundgren and J. Wasen: Journal of the European Ceramic Society Vol. 17 (1997), p.1285.

[9] Gao Ling and Haitao Yang: Materials Chemistry and Physics Vol. 90 (2005), p.31.