Contact Damage and Strength Degradation in Nitrided Pressureless Sintered (NPS) Silicon Nitrided Ceramics

Abstract:

A study is made of the damage resistance and strength degradation of nitrided pressureless sintered (NPS) silicon nitride ceramics. The silicon nitride is prepared by cost-effective NPS process combining by nitridation and consecutive pressureless sintering. Contact testing with spherical indenters is used to characterize the damage response. Examination of the indentation sites indicates a quasi-plastic damage modes are observed. Bend tests on specimens containing quasi-plastic contact damages reveal those materials to be not susceptible to strength degradation.

• Periodical: Key Engineering Materials (Volumes 353-358)
• Pages: 102-105
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.353-358.102
• Online since: September 2007
• Authors: Chang Gyu Kang, Chul Kim, Tae Woo Kim, In Sub Han, Kee Sung Lee
• Keywords: Contact Damage, Indentation, Nitrided Pressureless Sintering, Strength Degradation

References

[1] I. W. M. Brown, R. Pompe and R. Carlsson: J. Eur. Ceram. Soc. Vol. 6 (1990), p.191.

[2] I. S. Han, S. H. Cheon, Y. H. Chung, D. W. Seo, S. W. Lee, S. K. Woo and K. S. Lee: Key. Eng. Mater. Vol. 317-318 (2006), p.125.

[3] C. G. Kang, J. G. Park, T. W. Kang, C. Kim, T. W. Kim, I. S. Han and K. S. Lee: Solid State Phenomena (2006), accepted.

[4] I. S. Han, K. S. Lee, D. W. Seo and S. K. Woo: J. Mater. Sci. Lett. Vol. 21 (2002), p.703.

[5] B. R. Lawn, S. K. Lee, I. M. Peterson and S. Wuttiphan: J. Am. Ceram. Soc. Vol. 81 (1998), p.1509.

[6] B. R. Lawn: J. Am. Ceram. Soc. Vol. 81 (1998), p. (1977).

[7] S. K. Lee, S. Wuttiphan, and B. R. Lawn: J. Am. Ceram. Soc. Vol. 80 (1997).

[5] are included in each graph.